WebDev/VersaWhiteboard
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allow browser zoom and improve performance

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This commit is contained in:
raphael 2020-03-19 20:42:46 +01:00
parent 62c77dac83
commit bc9f97b8da
1 changed files with 16 additions and 10 deletions
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26
public/js/whiteboard.js
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@ -27,8 +27,6 @@ var whiteboard = {
whiteboardId: "0",
username: "unknown",
sendFunction: null,
canvasWidth: 3000,
canvasHeight: 2000,
backgroundGridUrl: './images/KtEBa2.png'
},
loadWhiteboard: function (whiteboardContainer, newSettings) {
@ -51,7 +49,7 @@ var whiteboard = {
// 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="' + _this.settings.canvasWidth + '" height="' + _this.settings.canvasHeight + '"></svg>');
_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
@ -70,16 +68,24 @@ var whiteboard = {
.append(_this.textContainer)
.append(_this.mouseOverlay);
this.canvas = $("#whiteboardCanvas")[0];
this.canvas.height = _this.settings.canvasHeight;
this.canvas.width = _this.settings.canvasWidth;
this.canvas.height = $(window).height();
this.canvas.width = $(window).width();
this.ctx = this.canvas.getContext("2d");
this.oldGCO = this.ctx.globalCompositeOperation;
$(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
});
$(_this.mouseOverlay).on("mousedown touchstart", function (e) {
if (_this.imgDragActive || _this.drawFlag) {
return;
}
_this.drawFlag = true;
_this.prevX = (e.offsetX || e.pageX - $(e.target).offset().left) + 1;
_this.prevY = (e.offsetY || e.pageY - $(e.target).offset().top) + 1;
@ -133,7 +139,7 @@ var whiteboard = {
_this.textContainer.on("mousemove touchmove", function (e) {
e.preventDefault();
if (_this.imgDragActive || !$(e.target).hasClass("textcontainer")) {
return;
}
@ -173,11 +179,11 @@ var whiteboard = {
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" });
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" });
if (_this.ownCursor) _this.ownCursor.css({ "top": top + "px", "left": left + "px" });
} else if (_this.tool === "line") {
if (svgLine) {
if (_this.pressedKeys.shift) {
@ -322,7 +328,7 @@ var whiteboard = {
_this.drawFlag = false;
_this.mouseover = false;
_this.ctx.globalCompositeOperation = _this.oldGCO;
if(_this.ownCursor) _this.ownCursor.remove();
if (_this.ownCursor) _this.ownCursor.remove();
_this.svgContainer.find("line").remove();
_this.svgContainer.find("rect").remove();
_this.svgContainer.find("circle").remove();