VersaWhiteboard/public/js/whiteboard.js

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JavaScript
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var whiteboard = {
canvas: null,
ctx: null,
drawcolor: "black",
tool: "pen",
thickness: 4,
prevX: null,
prevY: null,
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latestTouchCoods: [],
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drawFlag: false,
oldGCO: null,
mouseover: false,
lineCap: "round", //butt, square
backgroundGrid: null,
canvasElement: null,
cursorContainer: null,
imgContainer: null,
svgContainer: null, //For draw prev
mouseOverlay: null,
ownCursor: null,
drawBuffer: [],
drawId: 0, //Used for undo function
imgDragActive: false,
latestActiveTextBoxId: false, //The id of the latest clicked Textbox (for font and color change)
pressedKeys: {},
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settings: {
whiteboardId: "0",
username: "unknown",
sendFunction: null,
canvasWidth: 3000,
canvasHeight: 2000,
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backgroundGridUrl: './images/KtEBa2.png'
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},
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loadWhiteboard: function (whiteboardContainer, newSettings) {
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var svgns = "http://www.w3.org/2000/svg";
var _this = this;
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for (var i in newSettings) {
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this.settings[i] = newSettings[i];
}
this.settings["username"] = this.settings["username"].replace(/[^0-9a-z]/gi, '');
this.settings["whiteboardId"] = this.settings["whiteboardId"].replace(/[^0-9a-z]/gi, '');
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var startCoords = [];
var svgLine = null;
var svgRect = null;
var svgCirle = null;
//background grid (repeating image) and smallest screen indication
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_this.backgroundGrid = $('<div style="position: absolute; left:0px; top:0; opacity: 0.2; background-image:url(\'' + _this.settings["backgroundGridUrl"] + '\'); height: 100%; width: 100%;"></div>');
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// container for background images
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_this.imgContainer = $('<div style="position: absolute; left:0px; top:0; height: 100%; width: 100%;"></div>');
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// whiteboard canvas
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_this.canvasElement = $('<canvas id="whiteboardCanvas" style="position: absolute; left:0px; top:0; cursor:crosshair;"></canvas>');
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// SVG container holding drawing or moving previews
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_this.svgContainer = $('<svg style="position: absolute; top:0px; left:0px;" width="' + _this.settings.canvasWidth + '" height="' + _this.settings.canvasHeight + '"></svg>');
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// drag and drop indicator, hidden by default
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_this.dropIndicator = $('<div style="position:absolute; height: 100%; width: 100%; border: 7px dashed gray; text-align: center; top: 0px; left: 0px; color: gray; font-size: 23em; display: none;"><i class="far fa-plus-square" aria-hidden="true"></i></div>')
// container for other users cursors
_this.cursorContainer = $('<div style="position: absolute; left:0px; top:0; height: 100%; width: 100%;"></div>');
// container for texts by users
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_this.textContainer = $('<div class="textcontainer" style="position: absolute; left:0px; top:0; height: 100%; width: 100%; cursor:text;"></div>');
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// mouse overlay for draw callbacks
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_this.mouseOverlay = $('<div style="cursor:none; position: absolute; left:0px; top:0; height: 100%; width: 100%;"></div>');
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$(whiteboardContainer).append(_this.backgroundGrid)
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.append(_this.imgContainer)
.append(_this.canvasElement)
.append(_this.svgContainer)
.append(_this.dropIndicator)
.append(_this.cursorContainer)
.append(_this.textContainer)
.append(_this.mouseOverlay);
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this.canvas = $("#whiteboardCanvas")[0];
this.canvas.height = _this.settings.canvasHeight;
this.canvas.width = _this.settings.canvasWidth;
this.ctx = this.canvas.getContext("2d");
this.oldGCO = this.ctx.globalCompositeOperation;
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$(_this.mouseOverlay).on("mousedown touchstart", function (e) {
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if (_this.imgDragActive || _this.drawFlag) {
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return;
}
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_this.drawFlag = true;
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_this.prevX = (e.offsetX || e.pageX - $(e.target).offset().left) + 1;
_this.prevY = (e.offsetY || e.pageY - $(e.target).offset().top) + 1;
if (!_this.prevX || !_this.prevY || (_this.prevX == 1 && _this.prevY == 1)) {
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var touche = e.touches[0];
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_this.prevX = touche.clientX - $(_this.mouseOverlay).offset().left + 1;
_this.prevY = touche.clientY - $(_this.mouseOverlay).offset().top + 1;
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latestTouchCoods = [_this.prevX, _this.prevY];
}
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if (_this.tool === "pen") {
_this.drawPenLine(_this.prevX, _this.prevY, _this.prevX, _this.prevY, _this.drawcolor, _this.thickness);
_this.sendFunction({ "t": _this.tool, "d": [_this.prevX, _this.prevY, _this.prevX, _this.prevY], "c": _this.drawcolor, "th": _this.thickness });
} else if (_this.tool === "eraser") {
_this.drawEraserLine(_this.prevX, _this.prevY, _this.prevX, _this.prevY, _this.thickness);
_this.sendFunction({ "t": _this.tool, "d": [_this.prevX, _this.prevY, _this.prevX, _this.prevY], "th": _this.thickness });
} else if (_this.tool === "line") {
startCoords = [_this.prevX, _this.prevY];
svgLine = document.createElementNS(svgns, 'line');
svgLine.setAttribute('stroke', 'gray');
svgLine.setAttribute('stroke-dasharray', '5, 5');
svgLine.setAttribute('x1', _this.prevX);
svgLine.setAttribute('y1', _this.prevY);
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svgLine.setAttribute('x2', _this.prevX);
svgLine.setAttribute('y2', _this.prevY);
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_this.svgContainer.append(svgLine);
} else if (_this.tool === "rect" || _this.tool === "recSelect") {
_this.svgContainer.find("rect").remove();
svgRect = document.createElementNS(svgns, 'rect');
svgRect.setAttribute('stroke', 'gray');
svgRect.setAttribute('stroke-dasharray', '5, 5');
svgRect.setAttribute('style', 'fill-opacity:0.0;');
svgRect.setAttribute('x', _this.prevX);
svgRect.setAttribute('y', _this.prevY);
svgRect.setAttribute('width', 0);
svgRect.setAttribute('height', 0);
_this.svgContainer.append(svgRect);
startCoords = [_this.prevX, _this.prevY];
} else if (_this.tool === "circle") {
svgCirle = document.createElementNS(svgns, 'circle');
svgCirle.setAttribute('stroke', 'gray');
svgCirle.setAttribute('stroke-dasharray', '5, 5');
svgCirle.setAttribute('style', 'fill-opacity:0.0;');
svgCirle.setAttribute('cx', _this.prevX);
svgCirle.setAttribute('cy', _this.prevY);
svgCirle.setAttribute('r', 0);
_this.svgContainer.append(svgCirle);
startCoords = [_this.prevX, _this.prevY];
}
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});
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_this.textContainer.on("mousemove touchmove", function (e) {
e.preventDefault();
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if (_this.imgDragActive || !$(e.target).hasClass("textcontainer")) {
return;
}
var currX = (e.offsetX || e.pageX - $(e.target).offset().left);
var currY = (e.offsetY || e.pageY - $(e.target).offset().top);
_this.sendFunction({ "t": "cursor", "event": "move", "d": [currX, currY], "username": _this.settings.username });
})
_this.mouseOverlay.on("mousemove touchmove", function (e) {
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e.preventDefault();
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if (_this.imgDragActive) {
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return;
}
var currX = (e.offsetX || e.pageX - $(e.target).offset().left);
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var currY = (e.offsetY || e.pageY - $(e.target).offset().top);
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window.requestAnimationFrame(function () {
if ((!currX || !currY) && e.touches && e.touches[0]) {
var touche = e.touches[0];
currX = touche.clientX - $(_this.mouseOverlay).offset().left;
currY = touche.clientY - $(_this.mouseOverlay).offset().top;
}
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_this.latestTouchCoods = [currX, currY];
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if (_this.drawFlag) {
if (_this.tool === "pen") {
_this.drawPenLine(currX, currY, _this.prevX, _this.prevY, _this.drawcolor, _this.thickness);
_this.sendFunction({ "t": _this.tool, "d": [currX, currY, _this.prevX, _this.prevY], "c": _this.drawcolor, "th": _this.thickness });
} else if (_this.tool == "eraser") {
_this.drawEraserLine(currX, currY, _this.prevX, _this.prevY, _this.thickness);
_this.sendFunction({ "t": _this.tool, "d": [currX, currY, _this.prevX, _this.prevY], "th": _this.thickness });
}
_this.prevX = currX;
_this.prevY = currY;
}
if (_this.tool === "eraser") {
var left = currX - _this.thickness;
var top = currY - _this.thickness;
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if(_this.ownCursor) _this.ownCursor.css({ "top": top + "px", "left": left + "px" });
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} else if (_this.tool === "pen") {
var left = currX - _this.thickness / 2;
var top = currY - _this.thickness / 2;
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if(_this.ownCursor) _this.ownCursor.css({ "top": top + "px", "left": left + "px" });
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} else if (_this.tool === "line") {
if (svgLine) {
if (_this.pressedKeys.shift) {
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var angs = getRoundedAngles(currX, currY);
currX = angs.x;
currY = angs.y;
}
svgLine.setAttribute('x2', currX);
svgLine.setAttribute('y2', currY);
}
} else if (_this.tool === "rect" || (_this.tool === "recSelect" && _this.drawFlag)) {
if (svgRect) {
var width = Math.abs(currX - startCoords[0]);
var height = Math.abs(currY - startCoords[1]);
if (_this.pressedKeys.shift) {
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height = width;
var x = currX < startCoords[0] ? startCoords[0] - width : startCoords[0];
var y = currY < startCoords[1] ? startCoords[1] - width : startCoords[1];
svgRect.setAttribute('x', x);
svgRect.setAttribute('y', y);
} else {
var x = currX < startCoords[0] ? currX : startCoords[0];
var y = currY < startCoords[1] ? currY : startCoords[1];
svgRect.setAttribute('x', x);
svgRect.setAttribute('y', y);
}
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svgRect.setAttribute('width', width);
svgRect.setAttribute('height', height);
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}
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} else if (_this.tool === "circle") {
var a = currX - startCoords[0];
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var b = currY - startCoords[1];
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var r = Math.sqrt(a * a + b * b);
if (svgCirle) {
svgCirle.setAttribute('r', r);
}
}
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});
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_this.sendFunction({ "t": "cursor", "event": "move", "d": [currX, currY], "username": _this.settings.username });
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});
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_this.mouseOverlay.on("mouseup touchend touchcancel", function (e) {
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if (_this.imgDragActive) {
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return;
}
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_this.drawFlag = false;
_this.drawId++;
_this.ctx.globalCompositeOperation = _this.oldGCO;
var currX = (e.offsetX || e.pageX - $(e.target).offset().left);
var currY = (e.offsetY || e.pageY - $(e.target).offset().top);
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if (!currX || !currY) {
currX = _this.latestTouchCoods[0];
currY = _this.latestTouchCoods[1];
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_this.sendFunction({ "t": "cursor", "event": "out", "username": _this.settings.username });
}
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if (_this.tool === "line") {
if (_this.pressedKeys.shift) {
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var angs = getRoundedAngles(currX, currY);
currX = angs.x;
currY = angs.y;
}
_this.drawPenLine(currX, currY, startCoords[0], startCoords[1], _this.drawcolor, _this.thickness);
_this.sendFunction({ "t": _this.tool, "d": [currX, currY, startCoords[0], startCoords[1]], "c": _this.drawcolor, "th": _this.thickness });
_this.svgContainer.find("line").remove();
} else if (_this.tool === "rect") {
if (_this.pressedKeys.shift) {
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if ((currY - startCoords[1]) * (currX - startCoords[0]) > 0) {
currY = startCoords[1] + (currX - startCoords[0]);
} else {
currY = startCoords[1] - (currX - startCoords[0]);
}
}
_this.drawRec(startCoords[0], startCoords[1], currX, currY, _this.drawcolor, _this.thickness);
_this.sendFunction({ "t": _this.tool, "d": [startCoords[0], startCoords[1], currX, currY], "c": _this.drawcolor, "th": _this.thickness });
_this.svgContainer.find("rect").remove();
} else if (_this.tool === "circle") {
var a = currX - startCoords[0];
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var b = currY - startCoords[1];
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var r = Math.sqrt(a * a + b * b);
_this.drawCircle(startCoords[0], startCoords[1], r, _this.drawcolor, _this.thickness);
_this.sendFunction({ "t": _this.tool, "d": [startCoords[0], startCoords[1], r], "c": _this.drawcolor, "th": _this.thickness });
_this.svgContainer.find("circle").remove();
} else if (_this.tool === "recSelect") {
_this.imgDragActive = true;
if (_this.pressedKeys.shift) {
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if ((currY - startCoords[1]) * (currX - startCoords[0]) > 0) {
currY = startCoords[1] + (currX - startCoords[0]);
} else {
currY = startCoords[1] - (currX - startCoords[0]);
}
}
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var width = Math.abs(startCoords[0] - currX);
var height = Math.abs(startCoords[1] - currY);
var left = startCoords[0] < currX ? startCoords[0] : currX;
var top = startCoords[1] < currY ? startCoords[1] : currY;
_this.mouseOverlay.css({ "cursor": "default" });
var imgDiv = $('<div style="position:absolute; left:' + left + 'px; top:' + top + 'px; width:' + width + 'px; border: 2px dotted gray; overflow: hidden; height:' + height + 'px;" cursor:move;">' +
'<canvas style="cursor:move; position:absolute; top:0px; left:0px;" width="' + width + '" height="' + height + '"/>' +
'<div style="position:absolute; right:5px; top:3px;">' +
'<button draw="1" style="margin: 0px 0px; background: #03a9f4; padding: 5px; margin-top: 3px; color: white;" class="addToCanvasBtn btn btn-default">Drop</button> ' +
'<button style="margin: 0px 0px; background: #03a9f4; padding: 5px; margin-top: 3px; color: white;" class="xCanvasBtn btn btn-default">x</button>' +
'</div>' +
'</div>');
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var dragCanvas = $(imgDiv).find("canvas");
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var dragOutOverlay = $('<div class="dragOutOverlay" style="position:absolute; left:' + left + 'px; top:' + top + 'px; width:' + width + 'px; height:' + height + 'px; background:white;"></div>');
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_this.mouseOverlay.append(dragOutOverlay);
_this.mouseOverlay.append(imgDiv);
var destCanvasContext = dragCanvas[0].getContext('2d');
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destCanvasContext.drawImage(_this.canvas, left, top, width, height, 0, 0, width, height);
imgDiv.find(".xCanvasBtn").click(function () {
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_this.imgDragActive = false;
_this.refreshCursorAppearance();
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imgDiv.remove();
dragOutOverlay.remove();
});
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imgDiv.find(".addToCanvasBtn").click(function () {
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_this.imgDragActive = false;
_this.refreshCursorAppearance();
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var p = imgDiv.position();
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var leftT = Math.round(p.left * 100) / 100;
var topT = Math.round(p.top * 100) / 100;
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_this.drawId++;
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_this.sendFunction({ "t": _this.tool, "d": [left, top, leftT, topT, width, height] });
_this.dragCanvasRectContent(left, top, leftT, topT, width, height);
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imgDiv.remove();
dragOutOverlay.remove();
});
imgDiv.draggable();
_this.svgContainer.find("rect").remove();
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}
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});
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_this.mouseOverlay.on("mouseout", function (e) {
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if (_this.imgDragActive) {
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return;
}
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_this.drawFlag = false;
_this.mouseover = false;
_this.ctx.globalCompositeOperation = _this.oldGCO;
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if(_this.ownCursor) _this.ownCursor.remove();
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_this.svgContainer.find("line").remove();
_this.svgContainer.find("rect").remove();
_this.svgContainer.find("circle").remove();
_this.sendFunction({ "t": "cursor", "event": "out" });
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});
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_this.mouseOverlay.on("mouseover", function (e) {
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if (_this.imgDragActive) {
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return;
}
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if (!_this.mouseover) {
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var color = _this.drawcolor;
var widthHeight = _this.thickness;
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if (_this.tool === "eraser") {
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color = "#00000000";
widthHeight = widthHeight * 2;
}
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if (_this.tool === "eraser" || _this.tool === "pen") {
_this.ownCursor = $('<div id="ownCursor" style="background:' + color + '; border:1px solid gray; position:absolute; width:' + widthHeight + 'px; height:' + widthHeight + 'px; border-radius:50%;"></div>');
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_this.cursorContainer.append(_this.ownCursor);
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}
}
_this.mouseover = true;
});
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//On textcontainer click (Add a new textbox)
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_this.textContainer.on("click", function (e) {
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currX = (e.offsetX || e.pageX - $(e.target).offset().left);
currY = (e.offsetY || e.pageY - $(e.target).offset().top);
var fontsize = _this.thickness * 0.5;
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var txId = 'tx' + (+new Date());
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_this.sendFunction({ "t": "addTextBox", "d": [_this.drawcolor, fontsize, currX, currY, txId] });
_this.addTextBox(_this.drawcolor, fontsize, currX, currY, txId, true);
});
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function getRoundedAngles(currX, currY) { //For drawing lines at 0,45,90° ....
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var x = currX - startCoords[0];
var y = currY - startCoords[1];
var angle = Math.atan2(x, y) * (180 / Math.PI);
var angle45 = Math.round(angle / 45) * 45;
if (angle45 % 90 == 0) {
if (Math.abs(currX - startCoords[0]) > Math.abs(currY - startCoords[1])) {
currY = startCoords[1]
} else {
currX = startCoords[0]
}
} else {
if ((currY - startCoords[1]) * (currX - startCoords[0]) > 0) {
currX = startCoords[0] + (currY - startCoords[1]);
} else {
currX = startCoords[0] - (currY - startCoords[1]);
}
}
return { "x": currX, "y": currY };
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}
},
entfKeyAction: function () {
var _this = this;
$.each(_this.mouseOverlay.find(".dragOutOverlay"), function () {
var width = $(this).width();
var height = $(this).height();
var p = $(this).position();
var left = Math.round(p.left * 100) / 100;
var top = Math.round(p.top * 100) / 100;
_this.drawId++;
_this.sendFunction({ "t": "eraseRec", "d": [left, top, width, height] });
_this.eraseRec(left, top, width, height);
});
_this.mouseOverlay.find(".xCanvasBtn").click(); //Remove all current drops
},
escKeyAction: function () {
var _this = this;
if (!_this.drawFlag) {
_this.svgContainer.empty();
}
_this.mouseOverlay.find(".xCanvasBtn").click(); //Remove all current drops
},
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dragCanvasRectContent: function (xf, yf, xt, yt, width, height) {
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var tempCanvas = document.createElement('canvas');
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tempCanvas.width = width;
tempCanvas.height = height;
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var tempCanvasContext = tempCanvas.getContext('2d');
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tempCanvasContext.drawImage(this.canvas, xf, yf, width, height, 0, 0, width, height);
this.eraseRec(xf, yf, width, height);
this.ctx.drawImage(tempCanvas, xt, yt);
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},
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eraseRec: function (fromX, fromY, width, height) {
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var _this = this;
_this.ctx.beginPath();
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_this.ctx.rect(fromX, fromY, width, height);
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_this.ctx.fillStyle = "rgba(0,0,0,1)";
_this.ctx.globalCompositeOperation = "destination-out";
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_this.ctx.fill();
_this.ctx.closePath();
_this.ctx.globalCompositeOperation = _this.oldGCO;
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},
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drawPenLine: function (fromX, fromY, toX, toY, color, thickness) {
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var _this = this;
_this.ctx.beginPath();
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_this.ctx.moveTo(fromX, fromY);
_this.ctx.lineTo(toX, toY);
_this.ctx.strokeStyle = color;
_this.ctx.lineWidth = thickness;
_this.ctx.lineCap = _this.lineCap;
_this.ctx.stroke();
_this.ctx.closePath();
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},
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drawEraserLine: function (fromX, fromY, toX, toY, thickness) {
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var _this = this;
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_this.ctx.beginPath();
_this.ctx.moveTo(fromX, fromY);
_this.ctx.lineTo(toX, toY);
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_this.ctx.strokeStyle = "rgba(0,0,0,1)";
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_this.ctx.lineWidth = thickness * 2;
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_this.ctx.lineCap = _this.lineCap;
_this.ctx.globalCompositeOperation = "destination-out";
_this.ctx.stroke();
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_this.ctx.closePath();
_this.ctx.globalCompositeOperation = _this.oldGCO;
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},
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drawRec: function (fromX, fromY, toX, toY, color, thickness) {
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var _this = this;
toX = toX - fromX;
toY = toY - fromY;
_this.ctx.beginPath();
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_this.ctx.rect(fromX, fromY, toX, toY);
_this.ctx.strokeStyle = color;
_this.ctx.lineWidth = thickness;
_this.ctx.lineCap = _this.lineCap;
_this.ctx.stroke();
_this.ctx.closePath();
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},
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drawCircle: function (fromX, fromY, radius, color, thickness) {
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var _this = this;
_this.ctx.beginPath();
_this.ctx.arc(fromX, fromY, radius, 0, 2 * Math.PI, false);
_this.ctx.lineWidth = thickness;
_this.ctx.strokeStyle = color;
_this.ctx.stroke();
},
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clearWhiteboard: function () {
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var _this = this;
_this.canvas.height = _this.canvas.height;
_this.imgContainer.empty();
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_this.textContainer.empty();
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_this.sendFunction({ "t": "clear" });
_this.drawBuffer = [];
_this.drawId = 0;
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},
setStrokeThickness(thickness) {
var _this = this;
_this.thickness = thickness;
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if (_this.tool == "text" && _this.latestActiveTextBoxId) {
_this.sendFunction({ "t": "setTextboxFontSize", "d": [_this.latestActiveTextBoxId, thickness] });
_this.setTextboxFontSize(_this.latestActiveTextBoxId, thickness);
}
},
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addImgToCanvasByUrl: function (url) {
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var _this = this;
var wasTextTool = false;
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if (_this.tool === "text") {
wasTextTool = true;
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_this.setTool("mouse"); //Set to mouse tool while dropping to prevent errors
}
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_this.imgDragActive = true;
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_this.mouseOverlay.css({ "cursor": "default" });
var imgDiv = $('<div style="border: 2px dashed gray; position:absolute; left:200px; top:200px; min-width:160px; min-height:100px; cursor:move;">' +
'<img style="width:100%; height:100%;" src="' + url + '">' +
'<div style="position:absolute; right:5px; top:3px;">' +
'<button draw="1" style="margin: 0px 0px; background: #03a9f4; padding: 5px; margin-top: 3px; color: white;" class="addToCanvasBtn btn btn-default">Draw to canvas</button> ' +
'<button draw="0" style="margin: 0px 0px; background: #03a9f4; padding: 5px; margin-top: 3px; color: white;" class="addToCanvasBtn btn btn-default">Add to background</button> ' +
'<button style="margin: 0px 0px; background: #03a9f4; padding: 5px; margin-top: 3px; color: white;" class="xCanvasBtn btn btn-default">x</button>' +
'</div>' +
'<i style="position:absolute; bottom: -4px; right: 2px; font-size: 2em; color: gray; transform: rotate(-45deg);" class="fas fa-sort-down" aria-hidden="true"></i>' +
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'</div>');
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imgDiv.find(".xCanvasBtn").click(function () {
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_this.imgDragActive = false;
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_this.refreshCursorAppearance();
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imgDiv.remove();
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if (wasTextTool) {
_this.setTool("text");
}
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});
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imgDiv.find(".addToCanvasBtn").click(function () {
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var draw = $(this).attr("draw");
_this.imgDragActive = false;
_this.refreshCursorAppearance();
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var width = imgDiv.width();
var height = imgDiv.height();
var p = imgDiv.position();
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var left = Math.round(p.left * 100) / 100;
var top = Math.round(p.top * 100) / 100;
if (draw == "1") { //draw image to canvas
_this.drawImgToCanvas(url, width, height, left, top);
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} else { //Add image to background
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_this.drawImgToBackground(url, width, height, left, top);
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}
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_this.sendFunction({ "t": "addImgBG", "draw": draw, "url": url, "d": [width, height, left, top] });
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_this.drawId++;
imgDiv.remove();
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if (wasTextTool) {
_this.setTool("text");
}
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});
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_this.mouseOverlay.append(imgDiv);
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imgDiv.draggable();
imgDiv.resizable();
},
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drawImgToBackground(url, width, height, left, top) {
this.imgContainer.append('<img crossorigin="anonymous" style="width:' + width + 'px; height:' + height + 'px; position:absolute; top:' + top + 'px; left:' + left + 'px;" src="' + url + '">')
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},
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addTextBox(textcolor, fontsize, left, top, txId, newLocalBox) {
var _this = this;
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var textBox = $('<div id="' + txId + '" class="textBox" style="font-family: monospace; position:absolute; top:' + top + 'px; left:' + left + 'px;">' +
'<div contentEditable="true" spellcheck="false" class="textContent" style="outline: none; font-size:' + fontsize + 'em; color:' + textcolor + '; min-width:50px; min-height:50px;"></div>' +
'<div title="remove textbox" class="removeIcon" style="position:absolute; cursor:pointer; top:-4px; right:2px;">x</div>' +
'<div title="move textbox" class="moveIcon" style="position:absolute; cursor:move; top:1px; left:2px; font-size: 0.5em;"><i class="fas fa-expand-arrows-alt"></i></div>' +
'</div>');
_this.latestActiveTextBoxId = txId;
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textBox.click(function (e) {
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e.preventDefault();
_this.latestActiveTextBoxId = txId;
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return false;
})
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textBox.on("mousemove touchmove", function (e) {
e.preventDefault();
if (_this.imgDragActive) {
return;
}
var textBoxPosition = textBox.position();
var currX = (e.offsetX + textBoxPosition.left);
var currY = (e.offsetY + textBoxPosition.top);
if ($(e.target).hasClass("removeIcon")) {
currX += textBox.width() - 4;
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}
_this.sendFunction({ "t": "cursor", "event": "move", "d": [currX, currY], "username": _this.settings.username });
})
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this.textContainer.append(textBox);
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textBox.draggable({
handle: ".moveIcon",
stop: function () {
var textBoxPosition = textBox.position();
_this.sendFunction({ "t": "setTextboxPosition", "d": [txId, textBoxPosition.top, textBoxPosition.left] });
},
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drag: function () {
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var textBoxPosition = textBox.position();
_this.sendFunction({ "t": "setTextboxPosition", "d": [txId, textBoxPosition.top, textBoxPosition.left] });
}
});
textBox.find(".textContent").on("input", function () {
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var text = btoa($(this).html()); //Get html and make encode base64
_this.sendFunction({ "t": "setTextboxText", "d": [txId, text] });
});
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textBox.find(".removeIcon").click(function (e) {
$("#" + txId).remove();
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_this.sendFunction({ "t": "removeTextbox", "d": [txId] });
e.preventDefault();
return false;
});
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if (newLocalBox) {
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textBox.find(".textContent").focus();
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}
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if (this.tool === "text") {
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textBox.addClass("active");
}
},
setTextboxText(txId, text) {
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$("#" + txId).find(".textContent").html(atob(text)); //Set decoded base64 as html
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},
removeTextbox(txId) {
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$("#" + txId).remove();
},
setTextboxPosition(txId, top, left) {
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$("#" + txId).css({ "top": top + "px", "left": left + "px" });
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},
setTextboxFontSize(txId, fontSize) {
$("#" + txId).find(".textContent").css({ "font-size": fontSize + "em" });
},
setTextboxFontColor(txId, color) {
$("#" + txId).find(".textContent").css({ "color": color });
},
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drawImgToCanvas(url, width, height, left, top, doneCallback) {
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var _this = this;
var img = document.createElement('img');
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img.onload = function () {
_this.ctx.drawImage(img, left, top, width, height);
if (doneCallback) {
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doneCallback();
}
}
img.src = url;
},
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undoWhiteboard: function (username) { //Not call this directly because you will get out of sync whit others...
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var _this = this;
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if (!username) {
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username = _this.settings.username;
}
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for (var i = _this.drawBuffer.length - 1; i >= 0; i--) {
if (_this.drawBuffer[i]["username"] == username) {
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var drawId = _this.drawBuffer[i]["drawId"];
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for (var i = _this.drawBuffer.length - 1; i >= 0; i--) {
if (_this.drawBuffer[i]["drawId"] == drawId && _this.drawBuffer[i]["username"] == username) {
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_this.drawBuffer.splice(i, 1);
}
}
break;
}
}
_this.canvas.height = _this.canvas.height;
_this.imgContainer.empty();
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_this.loadDataInSteps(_this.drawBuffer, false, function (stepData) {
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//Nothing to do
});
},
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undoWhiteboardClick: function () {
this.sendFunction({ "t": "undo" });
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this.undoWhiteboard();
},
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setTool: function (tool) {
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this.tool = tool;
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if (this.tool === "text") {
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$(".textBox").addClass("active");
this.textContainer.appendTo($(whiteboardContainer)); //Bring textContainer to the front
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} else {
$(".textBox").removeClass("active");
this.mouseOverlay.appendTo($(whiteboardContainer));
}
this.refreshCursorAppearance();
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this.mouseOverlay.find(".xCanvasBtn").click();
this.latestActiveTextBoxId = null;
},
setDrawColor(color) {
var _this = this;
_this.drawcolor = color;
if (_this.tool == "text" && _this.latestActiveTextBoxId) {
_this.sendFunction({ "t": "setTextboxFontColor", "d": [_this.latestActiveTextBoxId, color] });
_this.setTextboxFontColor(_this.latestActiveTextBoxId, color);
}
},
updateSmallestScreenResolution(width, height) {
this.backgroundGrid.empty();
if (width < $(window).width() || height < $(window).height()) {
this.backgroundGrid.append('<div style="position:absolute; left:0px; top:0px; border-right:3px dotted black; border-bottom:3px dotted black; width:' + width + 'px; height:' + height + 'px;"></div>');
this.backgroundGrid.append('<div style="position:absolute; left:' + (width + 5) + 'px; top:0px;">smallest screen participating</div>');
}
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},
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handleEventsAndData: function (content, isNewData, doneCallback) {
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var _this = this;
var tool = content["t"];
var data = content["d"];
var color = content["c"];
var username = content["username"];
var thickness = content["th"];
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window.requestAnimationFrame(function () {
if (tool === "line" || tool === "pen") {
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_this.drawPenLine(data[0], data[1], data[2], data[3], color, thickness);
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} else if (tool === "rect") {
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_this.drawRec(data[0], data[1], data[2], data[3], color, thickness);
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} else if (tool === "circle") {
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_this.drawCircle(data[0], data[1], data[2], color, thickness);
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} else if (tool === "eraser") {
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_this.drawEraserLine(data[0], data[1], data[2], data[3], thickness);
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} else if (tool === "eraseRec") {
_this.eraseRec(data[0], data[1], data[2], data[3]);
} else if (tool === "recSelect") {
_this.dragCanvasRectContent(data[0], data[1], data[2], data[3], data[4], data[5]);
} else if (tool === "addImgBG") {
if (content["draw"] == "1") {
_this.drawImgToCanvas(content["url"], data[0], data[1], data[2], data[3], doneCallback)
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} else {
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_this.drawImgToBackground(content["url"], data[0], data[1], data[2], data[3]);
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}
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} else if (tool === "addTextBox") {
_this.addTextBox(data[0], data[1], data[2], data[3], data[4]);
} else if (tool === "setTextboxText") {
_this.setTextboxText(data[0], data[1]);
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} else if (tool === "removeTextbox") {
_this.removeTextbox(data[0]);
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} else if (tool === "setTextboxPosition") {
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_this.setTextboxPosition(data[0], data[1], data[2]);
} else if (tool === "setTextboxFontSize") {
_this.setTextboxFontSize(data[0], data[1]);
} else if (tool === "setTextboxFontColor") {
_this.setTextboxFontColor(data[0], data[1]);
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} else if (tool === "clear") {
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_this.canvas.height = _this.canvas.height;
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_this.imgContainer.empty();
_this.textContainer.empty();
_this.drawBuffer = [];
_this.drawId = 0;
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} else if (tool === "cursor" && _this.settings) {
if (content["event"] === "move") {
if (_this.cursorContainer.find("." + content["username"]).length >= 1) {
_this.cursorContainer.find("." + content["username"]).css({ "left": data[0] + "px", "top": (data[1] - 15) + "px" });
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} else {
_this.cursorContainer.append('<div style="font-size:0.8em; padding-left:2px; padding-right:2px; background:gray; color:white; border-radius:3px; position:absolute; left:' + data[0] + 'px; top:' + (data[1] - 151) + 'px;" class="userbadge ' + content["username"] + '">' +
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'<div style="width:4px; height:4px; background:gray; position:absolute; top:13px; left:-2px; border-radius:50%;"></div>' +
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content["username"] + '</div>');
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}
} else {
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_this.cursorContainer.find("." + content["username"]).remove();
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}
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} else if (tool === "undo") {
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_this.undoWhiteboard(username);
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}
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});
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if (isNewData && ["line", "pen", "rect", "circle", "eraser", "addImgBG", "recSelect", "eraseRec", "addTextBox", "setTextboxText", "removeTextbox", "setTextboxPosition", "setTextboxFontSize", "setTextboxFontColor"].includes(tool)) {
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content["drawId"] = content["drawId"] ? content["drawId"] : _this.drawId;
content["username"] = content["username"] ? content["username"] : _this.settings.username;
_this.drawBuffer.push(content);
}
},
userLeftWhiteboard(username) {
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this.cursorContainer.find("." + username).remove();
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},
refreshUserBadges() {
this.cursorContainer.find(".userbadge").remove();
},
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getImageDataBase64() {
_this = this;
var width = this.mouseOverlay.width();
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var height = this.mouseOverlay.height();
var copyCanvas = document.createElement('canvas');
copyCanvas.width = width;
copyCanvas.height = height;
var ctx = copyCanvas.getContext("2d");
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$.each(_this.imgContainer.find("img"), function () { //Draw Backgroundimages to the export canvas
var width = $(this).width();
var height = $(this).height();
var p = $(this).position();
var left = Math.round(p.left * 100) / 100;
var top = Math.round(p.top * 100) / 100;
ctx.drawImage(this, left, top, width, height);
});
var destCtx = copyCanvas.getContext('2d'); //Draw the maincanvas to the exportcanvas
destCtx.drawImage(this.canvas, 0, 0);
$.each($(".textBox"), function () { //Draw the text on top
var textContainer = $(this)
var textEl = $(this).find(".textContent");
var text = textEl.text();
var fontSize = textEl.css('font-size');
var fontColor = textEl.css('color');
var p = textContainer.position();
var left = Math.round(p.left * 100) / 100;
var top = Math.round(p.top * 100) / 100;
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top += 25; //Fix top position
ctx.font = fontSize + " monospace";
ctx.fillStyle = fontColor;
ctx.fillText(text, left, top);
});
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var url = copyCanvas.toDataURL();
return url;
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},
getImageDataJson() {
var sendObj = [];
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for (var i = 0; i < this.drawBuffer.length; i++) {
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sendObj.push(JSON.parse(JSON.stringify(this.drawBuffer[i])));
delete sendObj[i]["username"];
delete sendObj[i]["wid"];
delete sendObj[i]["drawId"];
}
return JSON.stringify(sendObj);
},
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loadData: function (content) {
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var _this = this;
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_this.loadDataInSteps(content, true, function (stepData) {
if (stepData["username"] == _this.settings.username && _this.drawId < stepData["drawId"]) {
_this.drawId = stepData["drawId"] + 1;
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}
});
},
loadDataInSteps(content, isNewData, callAfterEveryStep) {
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var _this = this;
function lData(index) {
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for (var i = index; i < content.length; i++) {
if (content[i]["t"] === "addImgBG" && content[i]["draw"] == "1") {
_this.handleEventsAndData(content[i], isNewData, function () {
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callAfterEveryStep(content[i], i);
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lData(i + 1);
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});
break;
} else {
_this.handleEventsAndData(content[i], isNewData);
callAfterEveryStep(content[i], i);
}
}
}
lData(0);
},
loadJsonData(content, doneCallback) {
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var _this = this;
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_this.loadDataInSteps(content, false, function (stepData, index) {
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_this.sendFunction(stepData);
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if (index >= content.length - 1) { //Done with all data
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_this.drawId++;
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if (doneCallback) {
doneCallback();
}
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}
});
},
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sendFunction: function (content) { //Sends every draw to server
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var _this = this;
content["wid"] = _this.settings.whiteboardId;
content["username"] = _this.settings.username;
content["drawId"] = _this.drawId;
var tool = content["t"];
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if (_this.settings.sendFunction) {
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_this.settings.sendFunction(content);
}
if (["line", "pen", "rect", "circle", "eraser", "addImgBG", "recSelect", "eraseRec", "addTextBox", "setTextboxText", "removeTextbox", "setTextboxPosition", "setTextboxFontSize", "setTextboxFontColor"].includes(tool)) {
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_this.drawBuffer.push(content);
}
},
refreshCursorAppearance() { //Set cursor depending on current active tool
var _this = this;
if (_this.tool === "pen" || _this.tool === "eraser") {
_this.mouseOverlay.css({ "cursor": "none" });
} else if (_this.tool === "mouse") {
this.mouseOverlay.css({ "cursor": "default" });
} else { //Line, Rec, Circle, Cutting
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_this.mouseOverlay.css({ "cursor": "crosshair" });
}
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}
}