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VersaWhiteboard/public/js/whiteboard.js

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fix spelling error and format code
2018-09-08 19:15:23 +02:00
var whiteboard = {
add support for other charsets and reformat code
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canvas: null,
ctx: null,
drawcolor: "black",
tool: "pen",
thickness: 4,
prevX: null,
prevY: null,
latestTouchCoods: [],
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,
add shortcut function and move js libs
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startCoords: [],
Use Lanczos interpolation for smooth pen path
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penSmoothLastCoords: [],
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svgLine: null,
svgRect: null,
svgCirle: null,
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drawBuffer: [],
Add redo method. Closes #14
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undoBuffer: [],
drawId: 0, //Used for undo/redo functions
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imgDragActive: false,
latestActiveTextBoxId: false, //The id of the latest clicked Textbox (for font and color change)
pressedKeys: {},
settings: {
whiteboardId: "0",
username: "unknown",
sendFunction: null,
backgroundGridUrl: './images/KtEBa2.png'
},
loadWhiteboard: function (whiteboardContainer, newSettings) {
var svgns = "http://www.w3.org/2000/svg";
var _this = this;
for (var i in newSettings) {
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, '');
replace spezial chars in username and whiteboardId
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//background grid (repeating image) and smallest screen indication
_this.backgroundGrid = $('<div style="position: absolute; left:0px; top:0; opacity: 0.2; background-image:url(\'' + _this.settings["backgroundGridUrl"] + '\'); height: 100%; width: 100%;"></div>');
// container for background images
_this.imgContainer = $('<div style="position: absolute; left:0px; top:0; height: 100%; width: 100%;"></div>');
// whiteboard canvas
_this.canvasElement = $('<canvas id="whiteboardCanvas" style="position: absolute; left:0px; top:0; cursor:crosshair;"></canvas>');
// SVG container holding drawing or moving previews
_this.svgContainer = $('<svg style="position: absolute; top:0px; left:0px;" width="100%" height="100%"></svg>');
// drag and drop indicator, hidden by default
_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
_this.textContainer = $('<div class="textcontainer" style="position: absolute; left:0px; top:0; height: 100%; width: 100%; cursor:text;"></div>');
// mouse overlay for draw callbacks
_this.mouseOverlay = $('<div style="cursor:none; position: absolute; left:0px; top:0; height: 100%; width: 100%;"></div>');
basic whiteboard with no btns
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$(whiteboardContainer).append(_this.backgroundGrid)
.append(_this.imgContainer)
.append(_this.canvasElement)
.append(_this.svgContainer)
.append(_this.dropIndicator)
.append(_this.cursorContainer)
.append(_this.textContainer)
.append(_this.mouseOverlay);
this.canvas = $("#whiteboardCanvas")[0];
this.canvas.height = $(window).height();
this.canvas.width = $(window).width();
this.ctx = this.canvas.getContext("2d");
this.oldGCO = this.ctx.globalCompositeOperation;
basic whiteboard with no btns
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$(window).resize(function () { //Handel resize
var dbCp = JSON.parse(JSON.stringify(_this.drawBuffer)); //Copy the buffer
_this.canvas.width = $(window).width();
_this.canvas.height = $(window).height(); //Set new canvas height
_this.drawBuffer = [];
_this.loadData(dbCp); //draw old content in
});
allow browser zoom and improve performance
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add support for other charsets and reformat code
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$(_this.mouseOverlay).on("mousedown touchstart", function (e) {
if (_this.imgDragActive || _this.drawFlag) {
return;
}
allow browser zoom and improve performance
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_this.drawFlag = true;
_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)) {
var touche = e.touches[0];
_this.prevX = touche.clientX - $(_this.mouseOverlay).offset().left + 1;
_this.prevY = touche.clientY - $(_this.mouseOverlay).offset().top + 1;
latestTouchCoods = [_this.prevX, _this.prevY];
}
basic whiteboard with no btns
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if (_this.tool === "pen") {
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_this.penSmoothLastCoords = [_this.prevX, _this.prevY, _this.prevX, _this.prevY, _this.prevX, _this.prevY]
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} 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") {
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_this.startCoords = [_this.prevX, _this.prevY];
_this.svgLine = document.createElementNS(svgns, 'line');
_this.svgLine.setAttribute('stroke', 'gray');
_this.svgLine.setAttribute('stroke-dasharray', '5, 5');
_this.svgLine.setAttribute('x1', _this.prevX);
_this.svgLine.setAttribute('y1', _this.prevY);
_this.svgLine.setAttribute('x2', _this.prevX);
_this.svgLine.setAttribute('y2', _this.prevY);
_this.svgContainer.append(_this.svgLine);
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} else if (_this.tool === "rect" || _this.tool === "recSelect") {
_this.svgContainer.find("rect").remove();
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_this.svgRect = document.createElementNS(svgns, 'rect');
_this.svgRect.setAttribute('stroke', 'gray');
_this.svgRect.setAttribute('stroke-dasharray', '5, 5');
_this.svgRect.setAttribute('style', 'fill-opacity:0.0;');
_this.svgRect.setAttribute('x', _this.prevX);
_this.svgRect.setAttribute('y', _this.prevY);
_this.svgRect.setAttribute('width', 0);
_this.svgRect.setAttribute('height', 0);
_this.svgContainer.append(_this.svgRect);
_this.startCoords = [_this.prevX, _this.prevY];
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} else if (_this.tool === "circle") {
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_this.svgCirle = document.createElementNS(svgns, 'circle');
_this.svgCirle.setAttribute('stroke', 'gray');
_this.svgCirle.setAttribute('stroke-dasharray', '5, 5');
_this.svgCirle.setAttribute('style', 'fill-opacity:0.0;');
_this.svgCirle.setAttribute('cx', _this.prevX);
_this.svgCirle.setAttribute('cy', _this.prevY);
_this.svgCirle.setAttribute('r', 0);
_this.svgContainer.append(_this.svgCirle);
_this.startCoords = [_this.prevX, _this.prevY];
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}
});
basic whiteboard with no btns
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_this.textContainer.on("mousemove touchmove", function (e) {
e.preventDefault();
allow browser zoom and improve performance
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if (_this.imgDragActive || !$(e.target).hasClass("textcontainer")) {
return;
}
send cursor position in text mode
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add support for other charsets and reformat code
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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 });
})
send cursor position in text mode
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_this.mouseOverlay.on("mousemove touchmove", function (e) {
e.preventDefault();
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_this.triggerMouseMove(e);
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});
basic whiteboard with no btns
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_this.mouseOverlay.on("mouseup touchend touchcancel", function (e) {
if (_this.imgDragActive) {
return;
}
_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);
fix touch bugs on mobile devices
2020-02-18 19:46:03 +01:00
add support for other charsets and reformat code
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if (!currX || !currY) {
currX = _this.latestTouchCoods[0];
currY = _this.latestTouchCoods[1];
_this.sendFunction({ "t": "cursor", "event": "out", "username": _this.settings.username });
}
basic whiteboard with no btns
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if (_this.tool === "line") {
if (_this.pressedKeys.shift) {
fix shift draw with line tool
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var angs = _this.getRoundedAngles(currX, currY);
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currX = angs.x;
currY = angs.y;
}
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_this.drawPenLine(currX, currY, _this.startCoords[0], _this.startCoords[1], _this.drawcolor, _this.thickness);
_this.sendFunction({ "t": _this.tool, "d": [currX, currY, _this.startCoords[0], _this.startCoords[1]], "c": _this.drawcolor, "th": _this.thickness });
add support for other charsets and reformat code
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_this.svgContainer.find("line").remove();
Use Lanczos interpolation for smooth pen path
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} else if (_this.tool === "pen") {
The last point of a line should be added with the same drawID as the rest of the line.
2020-04-17 17:53:53 +02:00
_this.drawId--;
Use Lanczos interpolation for smooth pen path
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_this.pushPointSmoothPen(currX, currY);
The last point of a line should be added with the same drawID as the rest of the line.
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_this.drawId++;
add support for other charsets and reformat code
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} else if (_this.tool === "rect") {
if (_this.pressedKeys.shift) {
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if ((currY - _this.startCoords[1]) * (currX - _this.startCoords[0]) > 0) {
currY = _this.startCoords[1] + (currX - _this.startCoords[0]);
add support for other charsets and reformat code
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} else {
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currY = _this.startCoords[1] - (currX - _this.startCoords[0]);
add support for other charsets and reformat code
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}
}
add shortcut function and move js libs
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_this.drawRec(_this.startCoords[0], _this.startCoords[1], currX, currY, _this.drawcolor, _this.thickness);
_this.sendFunction({ "t": _this.tool, "d": [_this.startCoords[0], _this.startCoords[1], currX, currY], "c": _this.drawcolor, "th": _this.thickness });
add support for other charsets and reformat code
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_this.svgContainer.find("rect").remove();
} else if (_this.tool === "circle") {
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var a = currX - _this.startCoords[0];
var b = currY - _this.startCoords[1];
add support for other charsets and reformat code
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var r = Math.sqrt(a * a + b * b);
add shortcut function and move js libs
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_this.drawCircle(_this.startCoords[0], _this.startCoords[1], r, _this.drawcolor, _this.thickness);
_this.sendFunction({ "t": _this.tool, "d": [_this.startCoords[0], _this.startCoords[1], r], "c": _this.drawcolor, "th": _this.thickness });
add support for other charsets and reformat code
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_this.svgContainer.find("circle").remove();
} else if (_this.tool === "recSelect") {
_this.imgDragActive = true;
if (_this.pressedKeys.shift) {
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if ((currY - _this.startCoords[1]) * (currX - _this.startCoords[0]) > 0) {
currY = _this.startCoords[1] + (currX - _this.startCoords[0]);
add support for other charsets and reformat code
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} else {
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currY = _this.startCoords[1] - (currX - _this.startCoords[0]);
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}
}
basic whiteboard with no btns
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var width = Math.abs(_this.startCoords[0] - currX);
var height = Math.abs(_this.startCoords[1] - currY);
var left = _this.startCoords[0] < currX ? _this.startCoords[0] : currX;
var top = _this.startCoords[1] < currY ? _this.startCoords[1] : currY;
add support for other charsets and reformat code
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_this.mouseOverlay.css({ "cursor": "default" });
fix and add keybinds
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var imgDiv = $('<div class="dragMe" style="position:absolute; left:' + left + 'px; top:' + top + 'px; width:' + width + 'px; border: 2px dotted gray; overflow: hidden; height:' + height + 'px;" cursor:move;">' +
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'<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>');
var dragCanvas = $(imgDiv).find("canvas");
var dragOutOverlay = $('<div class="dragOutOverlay" style="position:absolute; left:' + left + 'px; top:' + top + 'px; width:' + width + 'px; height:' + height + 'px; background:white;"></div>');
_this.mouseOverlay.append(dragOutOverlay);
_this.mouseOverlay.append(imgDiv);
basic whiteboard with no btns
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var destCanvasContext = dragCanvas[0].getContext('2d');
destCanvasContext.drawImage(_this.canvas, left, top, width, height, 0, 0, width, height);
imgDiv.find(".xCanvasBtn").click(function () {
_this.imgDragActive = false;
_this.refreshCursorAppearance();
imgDiv.remove();
dragOutOverlay.remove();
});
imgDiv.find(".addToCanvasBtn").click(function () {
_this.imgDragActive = false;
_this.refreshCursorAppearance();
var p = imgDiv.position();
var leftT = Math.round(p.left * 100) / 100;
var topT = Math.round(p.top * 100) / 100;
_this.drawId++;
_this.sendFunction({ "t": _this.tool, "d": [left, top, leftT, topT, width, height] });
_this.dragCanvasRectContent(left, top, leftT, topT, width, height);
imgDiv.remove();
dragOutOverlay.remove();
});
imgDiv.draggable();
_this.svgContainer.find("rect").remove();
}
});
basic whiteboard with no btns
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_this.mouseOverlay.on("mouseout", function (e) {
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_this.triggerMouseOut();
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});
basic whiteboard with no btns
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_this.mouseOverlay.on("mouseover", function (e) {
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_this.triggerMouseOver();
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});
basic whiteboard with no btns
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//On textcontainer click (Add a new textbox)
_this.textContainer.on("click", function (e) {
currX = (e.offsetX || e.pageX - $(e.target).offset().left);
currY = (e.offsetY || e.pageY - $(e.target).offset().top);
var fontsize = _this.thickness * 0.5;
var txId = 'tx' + (+new Date());
_this.sendFunction({ "t": "addTextBox", "d": [_this.drawcolor, fontsize, currX, currY, txId] });
_this.addTextBox(_this.drawcolor, fontsize, currX, currY, txId, true);
});
fix shift draw with line tool
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},
getRoundedAngles: function (currX, currY) { //For drawing lines at 0,45,90° ....
var _this = this;
var x = currX - _this.startCoords[0];
var y = currY - _this.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 - _this.startCoords[0]) > Math.abs(currY - _this.startCoords[1])) {
currY = _this.startCoords[1]
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} else {
fix shift draw with line tool
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currX = _this.startCoords[0]
}
} else {
if ((currY - _this.startCoords[1]) * (currX - _this.startCoords[0]) > 0) {
currX = _this.startCoords[0] + (currY - _this.startCoords[1]);
} else {
currX = _this.startCoords[0] - (currY - _this.startCoords[1]);
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}
}
fix shift draw with line tool
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return { "x": currX, "y": currY };
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},
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triggerMouseMove: function (e) {
var _this = this;
if (_this.imgDragActive) {
return;
}
var currX = e.currX || (e.offsetX || e.pageX - $(e.target).offset().left);
var currY = e.currY || (e.offsetY || e.pageY - $(e.target).offset().top);
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;
}
_this.latestTouchCoods = [currX, currY];
if (_this.drawFlag) {
if (_this.tool === "pen") {
Use Lanczos interpolation for smooth pen path
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_this.pushPointSmoothPen(currX, currY);
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} 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 });
}
}
if (_this.tool === "eraser") {
var left = currX - _this.thickness;
var top = currY - _this.thickness;
if (_this.ownCursor) _this.ownCursor.css({ "top": top + "px", "left": left + "px" });
} else if (_this.tool === "pen") {
var left = currX - _this.thickness / 2;
var top = currY - _this.thickness / 2;
if (_this.ownCursor) _this.ownCursor.css({ "top": top + "px", "left": left + "px" });
} else if (_this.tool === "line") {
if (_this.svgLine) {
if (_this.pressedKeys.shift) {
fix shift draw with line tool
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var angs = _this.getRoundedAngles(currX, currY);
add shortcut function and move js libs
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currX = angs.x;
currY = angs.y;
}
_this.svgLine.setAttribute('x2', currX);
_this.svgLine.setAttribute('y2', currY);
}
} else if (_this.tool === "rect" || (_this.tool === "recSelect" && _this.drawFlag)) {
if (_this.svgRect) {
var width = Math.abs(currX - _this.startCoords[0]);
var height = Math.abs(currY - _this.startCoords[1]);
if (_this.pressedKeys.shift) {
height = width;
var x = currX < _this.startCoords[0] ? _this.startCoords[0] - width : _this.startCoords[0];
var y = currY < _this.startCoords[1] ? _this.startCoords[1] - width : _this.startCoords[1];
_this.svgRect.setAttribute('x', x);
_this.svgRect.setAttribute('y', y);
} else {
var x = currX < _this.startCoords[0] ? currX : _this.startCoords[0];
var y = currY < _this.startCoords[1] ? currY : _this.startCoords[1];
_this.svgRect.setAttribute('x', x);
_this.svgRect.setAttribute('y', y);
}
_this.svgRect.setAttribute('width', width);
_this.svgRect.setAttribute('height', height);
}
} else if (_this.tool === "circle") {
var a = currX - _this.startCoords[0];
var b = currY - _this.startCoords[1];
var r = Math.sqrt(a * a + b * b);
if (_this.svgCirle) {
_this.svgCirle.setAttribute('r', r);
}
}
_this.prevX = currX;
_this.prevY = currY;
});
_this.sendFunction({ "t": "cursor", "event": "move", "d": [currX, currY], "username": _this.settings.username });
},
triggerMouseOver: function () {
var _this = this;
if (_this.imgDragActive) {
return;
}
if (!_this.mouseover) {
var color = _this.drawcolor;
var widthHeight = _this.thickness;
if (_this.tool === "eraser") {
color = "#00000000";
widthHeight = widthHeight * 2;
}
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>');
_this.cursorContainer.append(_this.ownCursor);
}
}
_this.mouseover = true;
},
triggerMouseOut: function () {
var _this = this;
if (_this.imgDragActive) {
return;
}
_this.drawFlag = false;
_this.mouseover = false;
_this.ctx.globalCompositeOperation = _this.oldGCO;
if (_this.ownCursor) _this.ownCursor.remove();
_this.svgContainer.find("line").remove();
_this.svgContainer.find("rect").remove();
_this.svgContainer.find("circle").remove();
_this.sendFunction({ "t": "cursor", "event": "out" });
},
redrawMouseCursor: function () {
var _this = this;
_this.triggerMouseOut();
_this.triggerMouseOver();
_this.triggerMouseMove({ currX: whiteboard.prevX, currY: whiteboard.prevY });
},
delKeyAction: function () {
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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
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_this.textContainer.find("#" + _this.latestActiveTextBoxId).find(".removeIcon").click();
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},
escKeyAction: function () {
var _this = this;
if (!_this.drawFlag) {
_this.svgContainer.empty();
}
_this.mouseOverlay.find(".xCanvasBtn").click(); //Remove all current drops
},
Use Lanczos interpolation for smooth pen path
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pushPointSmoothPen: function (X, Y) {
var _this = this;
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if (_this.penSmoothLastCoords.length >= 8) {
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_this.penSmoothLastCoords = [_this.penSmoothLastCoords[2], _this.penSmoothLastCoords[3], _this.penSmoothLastCoords[4], _this.penSmoothLastCoords[5], _this.penSmoothLastCoords[6], _this.penSmoothLastCoords[7]]
}
_this.penSmoothLastCoords.push(X, Y)
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if (_this.penSmoothLastCoords.length >= 8) {
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_this.drawPenSmoothLine(_this.penSmoothLastCoords, _this.drawcolor, _this.thickness);
_this.sendFunction({ "t": _this.tool, "d": _this.penSmoothLastCoords, "c": _this.drawcolor, "th": _this.thickness });
}
},
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dragCanvasRectContent: function (xf, yf, xt, yt, width, height) {
var tempCanvas = document.createElement('canvas');
tempCanvas.width = width;
tempCanvas.height = height;
var tempCanvasContext = tempCanvas.getContext('2d');
tempCanvasContext.drawImage(this.canvas, xf, yf, width, height, 0, 0, width, height);
this.eraseRec(xf, yf, width, height);
this.ctx.drawImage(tempCanvas, xt, yt);
},
eraseRec: function (fromX, fromY, width, height) {
var _this = this;
_this.ctx.beginPath();
_this.ctx.rect(fromX, fromY, width, height);
_this.ctx.fillStyle = "rgba(0,0,0,1)";
_this.ctx.globalCompositeOperation = "destination-out";
_this.ctx.fill();
_this.ctx.closePath();
_this.ctx.globalCompositeOperation = _this.oldGCO;
},
drawPenLine: function (fromX, fromY, toX, toY, color, thickness) {
var _this = this;
_this.ctx.beginPath();
_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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drawPenSmoothLine: function (coords, color, thickness) {
var _this = this;
var xm1 = coords[0];
var ym1 = coords[1];
var x0 = coords[2];
var y0 = coords[3];
var x1 = coords[4];
var y1 = coords[5];
var x2 = coords[6];
var y2 = coords[7];
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var length = Math.sqrt(Math.pow(x0 - x1, 2) + Math.pow(y0 - y1, 2));
var steps = Math.ceil(length / 5);
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_this.ctx.beginPath();
_this.ctx.moveTo(x0, y0);
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for (var i = 0; i < steps; i++) {
var point = lanczosInterpolate(xm1, ym1, x0, y0, x1, y1, x2, y2, (i + 1) / steps);
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_this.ctx.lineTo(point[0], point[1]);
}
_this.ctx.strokeStyle = color;
_this.ctx.lineWidth = thickness;
_this.ctx.lineCap = _this.lineCap;
_this.ctx.stroke();
_this.ctx.closePath();
},
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drawEraserLine: function (fromX, fromY, toX, toY, thickness) {
var _this = this;
_this.ctx.beginPath();
_this.ctx.moveTo(fromX, fromY);
_this.ctx.lineTo(toX, toY);
_this.ctx.strokeStyle = "rgba(0,0,0,1)";
_this.ctx.lineWidth = thickness * 2;
_this.ctx.lineCap = _this.lineCap;
_this.ctx.globalCompositeOperation = "destination-out";
_this.ctx.stroke();
_this.ctx.closePath();
_this.ctx.globalCompositeOperation = _this.oldGCO;
},
drawRec: function (fromX, fromY, toX, toY, color, thickness) {
var _this = this;
toX = toX - fromX;
toY = toY - fromY;
_this.ctx.beginPath();
_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();
},
drawCircle: function (fromX, fromY, radius, color, thickness) {
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();
},
clearWhiteboard: function () {
var _this = this;
_this.canvas.height = _this.canvas.height;
_this.imgContainer.empty();
_this.textContainer.empty();
_this.sendFunction({ "t": "clear" });
_this.drawBuffer = [];
Add redo method. Closes #14
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_this.undoBuffer = [];
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_this.drawId = 0;
},
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);
}
},
addImgToCanvasByUrl: function (url) {
var _this = this;
var wasTextTool = false;
if (_this.tool === "text") {
wasTextTool = true;
_this.setTool("mouse"); //Set to mouse tool while dropping to prevent errors
}
_this.imgDragActive = true;
_this.mouseOverlay.css({ "cursor": "default" });
fix and add keybinds
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var imgDiv = $('<div class="dragMe" style="border: 2px dashed gray; position:absolute; left:200px; top:200px; min-width:160px; min-height:100px; cursor:move;">' +
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'<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> ' +
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'<button draw="0" style="margin: 0px 0px; background: #03a9f4; padding: 5px; margin-top: 3px; color: white;" class="addToBackgroundBtn btn btn-default">Add to background</button> ' +
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'<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>' +
'</div>');
imgDiv.find(".xCanvasBtn").click(function () {
_this.imgDragActive = false;
_this.refreshCursorAppearance();
imgDiv.remove();
if (wasTextTool) {
_this.setTool("text");
}
});
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imgDiv.find(".addToCanvasBtn,.addToBackgroundBtn").click(function () {
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var draw = $(this).attr("draw");
_this.imgDragActive = false;
_this.refreshCursorAppearance();
var width = imgDiv.width();
var height = imgDiv.height();
var p = imgDiv.position();
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);
} else { //Add image to background
_this.drawImgToBackground(url, width, height, left, top);
}
_this.sendFunction({ "t": "addImgBG", "draw": draw, "url": url, "d": [width, height, left, top] });
_this.drawId++;
imgDiv.remove();
if (wasTextTool) {
_this.setTool("text");
}
});
_this.mouseOverlay.append(imgDiv);
imgDiv.draggable();
imgDiv.resizable();
},
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 + '">')
},
addTextBox(textcolor, fontsize, left, top, txId, newLocalBox) {
var _this = this;
var textBox = $('<div id="' + txId + '" class="textBox" style="font-family: Monospace; position:absolute; top:' + top + 'px; left:' + left + 'px;">' +
'<div contentEditable="true" spellcheck="false" class="textContent" style="outline: none; font-size:' + fontsize + 'em; color:' + textcolor + '; min-width:50px; min-height:50px;"></div>' +
'<div title="remove textbox" class="removeIcon" style="position:absolute; cursor:pointer; top:-4px; right:2px;">x</div>' +
'<div title="move textbox" class="moveIcon" style="position:absolute; cursor:move; top:1px; left:2px; font-size: 0.5em;"><i class="fas fa-expand-arrows-alt"></i></div>' +
'</div>');
_this.latestActiveTextBoxId = txId;
textBox.click(function (e) {
e.preventDefault();
_this.latestActiveTextBoxId = txId;
return false;
})
textBox.on("mousemove touchmove", function (e) {
e.preventDefault();
if (_this.imgDragActive) {
return;
}
var textBoxPosition = textBox.position();
var currX = (e.offsetX + textBoxPosition.left);
var currY = (e.offsetY + textBoxPosition.top);
if ($(e.target).hasClass("removeIcon")) {
currX += textBox.width() - 4;
}
_this.sendFunction({ "t": "cursor", "event": "move", "d": [currX, currY], "username": _this.settings.username });
})
this.textContainer.append(textBox);
textBox.draggable({
handle: ".moveIcon",
stop: function () {
var textBoxPosition = textBox.position();
_this.sendFunction({ "t": "setTextboxPosition", "d": [txId, textBoxPosition.top, textBoxPosition.left] });
},
drag: function () {
var textBoxPosition = textBox.position();
_this.sendFunction({ "t": "setTextboxPosition", "d": [txId, textBoxPosition.top, textBoxPosition.left] });
}
});
textBox.find(".textContent").on("input", function () {
var text = btoa(unescape(encodeURIComponent($(this).html()))); //Get html and make encode base64 also take care of the charset
_this.sendFunction({ "t": "setTextboxText", "d": [txId, text] });
});
textBox.find(".removeIcon").click(function (e) {
$("#" + txId).remove();
_this.sendFunction({ "t": "removeTextbox", "d": [txId] });
e.preventDefault();
return false;
});
if (newLocalBox) {
textBox.find(".textContent").focus();
}
if (this.tool === "text") {
textBox.addClass("active");
}
},
setTextboxText(txId, text) {
$("#" + txId).find(".textContent").html(decodeURIComponent(escape(atob(text)))); //Set decoded base64 as html
},
removeTextbox(txId) {
$("#" + txId).remove();
},
setTextboxPosition(txId, top, left) {
$("#" + txId).css({ "top": top + "px", "left": left + "px" });
},
setTextboxFontSize(txId, fontSize) {
$("#" + txId).find(".textContent").css({ "font-size": fontSize + "em" });
},
setTextboxFontColor(txId, color) {
$("#" + txId).find(".textContent").css({ "color": color });
},
drawImgToCanvas(url, width, height, left, top, doneCallback) {
var _this = this;
var img = document.createElement('img');
img.onload = function () {
_this.ctx.drawImage(img, left, top, width, height);
if (doneCallback) {
doneCallback();
}
}
img.src = url;
},
undoWhiteboard: function (username) { //Not call this directly because you will get out of sync whit others...
var _this = this;
if (!username) {
username = _this.settings.username;
}
for (var i = _this.drawBuffer.length - 1; i >= 0; i--) {
if (_this.drawBuffer[i]["username"] == username) {
var drawId = _this.drawBuffer[i]["drawId"];
for (var i = _this.drawBuffer.length - 1; i >= 0; i--) {
if (_this.drawBuffer[i]["drawId"] == drawId && _this.drawBuffer[i]["username"] == username) {
Add redo method. Closes #14
2020-04-17 19:37:19 +02:00
_this.undoBuffer.push(_this.drawBuffer[i])
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_this.drawBuffer.splice(i, 1);
}
}
break;
}
}
Add redo method. Closes #14
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if (_this.undoBuffer.length > 1000) {
_this.undoBuffer.splice(0, _this.undoBuffer.length-1000);
}
_this.canvas.height = _this.canvas.height;
_this.imgContainer.empty();
_this.loadDataInSteps(_this.drawBuffer, false, function (stepData) {
//Nothing to do
});
},
redoWhiteboard: function (username) { //Not call this directly because you will get out of sync whit others...
var _this = this;
if (!username) {
username = _this.settings.username;
}
for (var i = _this.undoBuffer.length - 1; i >= 0; i--) {
if (_this.undoBuffer[i]["username"] == username) {
var drawId = _this.undoBuffer[i]["drawId"];
for (var i = _this.undoBuffer.length - 1; i >= 0; i--) {
if (_this.undoBuffer[i]["drawId"] == drawId && _this.undoBuffer[i]["username"] == username) {
_this.drawBuffer.push(_this.undoBuffer[i])
_this.undoBuffer.splice(i, 1);
}
}
break;
}
}
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_this.canvas.height = _this.canvas.height;
_this.imgContainer.empty();
_this.loadDataInSteps(_this.drawBuffer, false, function (stepData) {
//Nothing to do
});
},
undoWhiteboardClick: function () {
this.sendFunction({ "t": "undo" });
this.undoWhiteboard();
},
Add redo method. Closes #14
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redoWhiteboardClick: function () {
this.sendFunction({ "t": "redo" });
this.redoWhiteboard();
},
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setTool: function (tool) {
this.tool = tool;
if (this.tool === "text") {
$(".textBox").addClass("active");
this.textContainer.appendTo($(whiteboardContainer)); //Bring textContainer to the front
} else {
$(".textBox").removeClass("active");
this.mouseOverlay.appendTo($(whiteboardContainer));
}
this.refreshCursorAppearance();
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>');
}
},
handleEventsAndData: function (content, isNewData, doneCallback) {
var _this = this;
var tool = content["t"];
var data = content["d"];
var color = content["c"];
var username = content["username"];
var thickness = content["th"];
window.requestAnimationFrame(function () {
if (tool === "line" || tool === "pen") {
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if (data.length == 4) { //Only used for old json imports
Use Lanczos interpolation for smooth pen path
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_this.drawPenLine(data[0], data[1], data[2], data[3], color, thickness);
} else {
_this.drawPenSmoothLine(data, color, thickness);
}
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} else if (tool === "rect") {
_this.drawRec(data[0], data[1], data[2], data[3], color, thickness);
} else if (tool === "circle") {
_this.drawCircle(data[0], data[1], data[2], color, thickness);
} else if (tool === "eraser") {
_this.drawEraserLine(data[0], data[1], data[2], data[3], thickness);
} 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)
} else {
_this.drawImgToBackground(content["url"], data[0], data[1], data[2], data[3]);
}
} 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]);
} else if (tool === "removeTextbox") {
_this.removeTextbox(data[0]);
} else if (tool === "setTextboxPosition") {
_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]);
} else if (tool === "clear") {
_this.canvas.height = _this.canvas.height;
_this.imgContainer.empty();
_this.textContainer.empty();
_this.drawBuffer = [];
Add redo method. Closes #14
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_this.undoBuffer = [];
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_this.drawId = 0;
} 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" });
} 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"] + '">' +
'<div style="width:4px; height:4px; background:gray; position:absolute; top:13px; left:-2px; border-radius:50%;"></div>' +
decodeURIComponent(atob(content["username"])) + '</div>');
}
} else {
_this.cursorContainer.find("." + content["username"]).remove();
}
} else if (tool === "undo") {
_this.undoWhiteboard(username);
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} else if (tool === "redo") {
_this.redoWhiteboard(username);
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}
});
basic whiteboard with no btns
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if (isNewData && ["line", "pen", "rect", "circle", "eraser", "addImgBG", "recSelect", "eraseRec", "addTextBox", "setTextboxText", "removeTextbox", "setTextboxPosition", "setTextboxFontSize", "setTextboxFontColor"].includes(tool)) {
content["drawId"] = content["drawId"] ? content["drawId"] : _this.drawId;
content["username"] = content["username"] ? content["username"] : _this.settings.username;
_this.drawBuffer.push(content);
}
},
userLeftWhiteboard(username) {
this.cursorContainer.find("." + username).remove();
},
refreshUserBadges() {
this.cursorContainer.find(".userbadge").remove();
},
getImageDataBase64() {
_this = this;
var width = this.mouseOverlay.width();
var height = this.mouseOverlay.height();
var copyCanvas = document.createElement('canvas');
copyCanvas.width = width;
copyCanvas.height = height;
var ctx = copyCanvas.getContext("2d");
basic whiteboard with no btns
2018-02-08 17:45:07 +01:00
add support for other charsets and reformat code
2020-03-20 17:29:20 +01:00
$.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);
});
fix text export to img
2019-04-05 14:26:02 +02:00
add support for other charsets and reformat code
2020-03-20 17:29:20 +01:00
var destCtx = copyCanvas.getContext('2d'); //Draw the maincanvas to the exportcanvas
destCtx.drawImage(this.canvas, 0, 0);
fix text export to img
2019-04-05 14:26:02 +02:00
add support for other charsets and reformat code
2020-03-20 17:29:20 +01:00
$.each($(".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;
top += 25; //Fix top position
ctx.font = fontSize + " Monospace";
ctx.fillStyle = fontColor;
ctx.fillText(text, left, top);
});
also render text when whiteboard is exported as img
2019-03-18 10:30:41 +01:00
add support for other charsets and reformat code
2020-03-20 17:29:20 +01:00
var url = copyCanvas.toDataURL();
return url;
},
getImageDataJson() {
var sendObj = [];
for (var i = 0; i < this.drawBuffer.length; i++) {
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);
},
loadData: function (content) {
var _this = this;
_this.loadDataInSteps(content, true, function (stepData) {
if (stepData["username"] == _this.settings.username && _this.drawId < stepData["drawId"]) {
_this.drawId = stepData["drawId"] + 1;
}
});
},
loadDataInSteps(content, isNewData, callAfterEveryStep) {
var _this = this;
basic whiteboard with no btns
2018-02-08 17:45:07 +01:00
add support for other charsets and reformat code
2020-03-20 17:29:20 +01:00
function lData(index) {
for (var i = index; i < content.length; i++) {
if (content[i]["t"] === "addImgBG" && content[i]["draw"] == "1") {
_this.handleEventsAndData(content[i], isNewData, function () {
callAfterEveryStep(content[i], i);
lData(i + 1);
});
break;
} else {
_this.handleEventsAndData(content[i], isNewData);
callAfterEveryStep(content[i], i);
}
}
}
lData(0);
},
loadJsonData(content, doneCallback) {
var _this = this;
_this.loadDataInSteps(content, false, function (stepData, index) {
_this.sendFunction(stepData);
if (index >= content.length - 1) { //Done with all data
_this.drawId++;
if (doneCallback) {
doneCallback();
}
}
});
},
sendFunction: function (content) { //Sends every draw to server
var _this = this;
content["wid"] = _this.settings.whiteboardId;
content["username"] = _this.settings.username;
content["drawId"] = _this.drawId;
var tool = content["t"];
if (_this.settings.sendFunction) {
_this.settings.sendFunction(content);
}
if (["line", "pen", "rect", "circle", "eraser", "addImgBG", "recSelect", "eraseRec", "addTextBox", "setTextboxText", "removeTextbox", "setTextboxPosition", "setTextboxFontSize", "setTextboxFontColor"].includes(tool)) {
_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
_this.mouseOverlay.css({ "cursor": "crosshair" });
}
}
Use Lanczos interpolation for smooth pen path
2020-04-09 23:59:15 +02:00
}
format code and move function to the bottom
2020-04-10 14:08:15 +02:00
function lanczosKernel(x) {
if (x == 0) {
return 1.0;
}
return 2 * Math.sin(Math.PI * x) * Math.sin(Math.PI * x / 2) / Math.pow(Math.PI * x, 2);
}
function lanczosInterpolate(xm1, ym1, x0, y0, x1, y1, x2, y2, a) {
var cm1 = lanczosKernel(1 + a);
var c0 = lanczosKernel(a);
var c1 = lanczosKernel(1 - a);
var c2 = lanczosKernel(2 - a);
var delta = (cm1 + c0 + c1 + c2 - 1) / 4;
cm1 -= delta;
c0 -= delta;
c1 -= delta;
c2 -= delta;
return [cm1 * xm1 + c0 * x0 + c1 * x1 + c2 * x2, cm1 * ym1 + c0 * y0 + c1 * y1 + c2 * y2];
}
Reference in New Issue Copy Permalink