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implemented multi touch, allowing mobile devices to zoom

This commit is contained in:
Bea 2020-04-15 21:01:21 +02:00
parent 4b86ec3eaa
commit 58631ac0b6
1 changed files with 103 additions and 18 deletions
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113
public/js/whiteboard.js
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@ -1,4 +1,5 @@
var whiteboard = {
isMultiTouch: false,
canvas: null,
ctx: null,
drawcolor: "black",
@ -74,7 +75,7 @@ var whiteboard = {
this.ctx = this.canvas.getContext("2d");
this.oldGCO = this.ctx.globalCompositeOperation;
$(window).resize(function () { //Handel resize
$(window).resize(function () { //Handle 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
@ -82,13 +83,17 @@ var whiteboard = {
_this.loadData(dbCp); //draw old content in
});
$(_this.mouseOverlay).on("mousedown touchstart", function (e) {
function handleMouseStart(e, isTouch) {
if (_this.imgDragActive || _this.drawFlag) {
return;
}
if(isTouch)
{
if (e.touches.length > 1) {
return; // if more than one fingers are touching the screen, dont draw
_this.isMultiTouch = true;
return; // if more than one finger is touching the screen, dont draw
}
}
_this.drawFlag = true;
@ -105,7 +110,11 @@ var whiteboard = {
_this.penSmoothLastCoords = [_this.prevX, _this.prevY, _this.prevX, _this.prevY, _this.prevX, _this.prevY]
} 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 });
_this.sendFunction({
"t": _this.tool,
"d": [_this.prevX, _this.prevY, _this.prevX, _this.prevY],
"th": _this.thickness
});
} else if (_this.tool === "line") {
_this.startCoords = [_this.prevX, _this.prevY];
_this.svgLine = document.createElementNS(svgns, 'line');
@ -139,9 +148,25 @@ var whiteboard = {
_this.svgContainer.append(_this.svgCirle);
_this.startCoords = [_this.prevX, _this.prevY];
}
}
$(_this.mouseOverlay).on( "touchstart", function (e) {
handleMouseStart(e, true);
});
_this.textContainer.on("mousemove touchmove", function (e) {
$(_this.mouseOverlay).on("mousedown", function (e) {
handleMouseStart(e, false);
});
function handleMouseMove(e, isTouch) {
if(isTouch)
{
if (e.touches.length > 1) {
_this.isMultiTouch = true;
return; // if more than one finger is touching the screen, dont draw
}
}
e.preventDefault();
if (_this.imgDragActive || !$(e.target).hasClass("textcontainer")) {
@ -150,15 +175,43 @@ var whiteboard = {
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.sendFunction({
"t": "cursor",
"event": "move",
"d": [currX, currY],
"username": _this.settings.username
});
}
_this.mouseOverlay.on("mousemove touchmove", function (e) {
e.preventDefault();
_this.triggerMouseMove(e);
_this.textContainer.on("touchmove", function (e) {
handleMouseMove(e, true);
});
_this.mouseOverlay.on("mouseup touchend touchcancel", function (e) {
_this.textContainer.on("mousemove", function (e) {
handleMouseMove(e, false);
});
function handleMouseMove2(e, isTouch) {
if(isTouch)
{
if (e.touches.length > 1) {
_this.isMultiTouch = true;
return; // if more than one finger is touching the screen, dont draw
}
}
e.preventDefault();
_this.triggerMouseMove(e);
}
_this.mouseOverlay.on("touchmove", function (e) {
handleMouseMove2(e, true);
});
_this.mouseOverlay.on("mousemove", function (e) {
handleMouseMove2(e, false);
});
function handleMouseUp(e, isTouch) {
if (_this.imgDragActive) {
return;
}
@ -174,6 +227,16 @@ var whiteboard = {
_this.sendFunction({"t": "cursor", "event": "out", "username": _this.settings.username});
}
if(isTouch)
{
if (_this.isMultiTouch) {
if (e.touches.length === 0) {
_this.isMultiTouch = false;
}
return; // if more than one finger is touching the screen, dont draw
}
}
if (_this.tool === "line") {
if (_this.pressedKeys.shift) {
var angs = _this.getRoundedAngles(currX, currY);
@ -181,7 +244,12 @@ var whiteboard = {
currY = angs.y;
}
_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 });
_this.sendFunction({
"t": _this.tool,
"d": [currX, currY, _this.startCoords[0], _this.startCoords[1]],
"c": _this.drawcolor,
"th": _this.thickness
});
_this.svgContainer.find("line").remove();
} else if (_this.tool === "pen") {
_this.pushPointSmoothPen(currX, currY);
@ -194,14 +262,24 @@ var whiteboard = {
}
}
_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 });
_this.sendFunction({
"t": _this.tool,
"d": [_this.startCoords[0], _this.startCoords[1], currX, currY],
"c": _this.drawcolor,
"th": _this.thickness
});
_this.svgContainer.find("rect").remove();
} 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);
_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 });
_this.sendFunction({
"t": _this.tool,
"d": [_this.startCoords[0], _this.startCoords[1], r],
"c": _this.drawcolor,
"th": _this.thickness
});
_this.svgContainer.find("circle").remove();
} else if (_this.tool === "recSelect") {
_this.imgDragActive = true;
@ -253,6 +331,13 @@ var whiteboard = {
imgDiv.draggable();
_this.svgContainer.find("rect").remove();
}
}
_this.mouseOverlay.on("touchend touchcancel", function (e) {
handleMouseUp(e, true);
});
_this.mouseOverlay.on("mouseup", function (e) {
handleMouseUp(e, false);
});
_this.mouseOverlay.on("mouseout", function (e) {