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share-drawings.js
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share-drawings.js
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// scripts on this page directly touches DOM-elements
// removing or altering anything may cause failures in the UI event handlers
// it is used only to bring collaboration for canvas-surface
var lastPointIndex = 0;
var uid;
window.addEventListener('message', function(event) {
if (!event.data) return;
if (!uid) {
uid = event.data.uid;
}
if (event.data.captureStream) {
webrtcHandler.createOffer(function(sdp) {
sdp.uid = uid;
window.parent.postMessage(sdp, '*');
});
return;
}
if (event.data.renderStream) {
setTemporaryLine();
return;
}
if (event.data.sdp) {
webrtcHandler.setRemoteDescription(event.data);
return;
}
if (event.data.genDataURL) {
var dataURL = context.canvas.toDataURL(event.data.format, 1);
window.parent.postMessage({
dataURL: dataURL,
uid: uid
}, '*');
return;
}
if (event.data.undo && points.length) {
var index = event.data.index;
if (event.data.tool) {
var newArray = [];
var length = points.length;
var reverse = points.reverse();
for (var i = 0; i < length; i++) {
var point = reverse[i];
if (point[0] !== event.data.tool) {
newArray.push(point);
}
}
points = newArray.reverse();
drawHelper.redraw();
syncPoints(true);
return;
}
if (index === 'all') {
points = [];
drawHelper.redraw();
syncPoints(true);
return;
}
if (index.numberOfLastShapes) {
try {
points.length -= index.numberOfLastShapes;
} catch (e) {
points = [];
}
drawHelper.redraw();
syncPoints(true);
return;
}
if (index === -1) {
if (points.length && points[points.length - 1][0] === 'pencil') {
var newArray = [];
var length = points.length;
var reverse = points.reverse();
var ended;
for (var i = 0; i < length; i++) {
var point = reverse[i];
if (point[3] == 'start') {
ended = true;
} else if (ended) {
newArray.push(point);
}
}
points = newArray.reverse();
drawHelper.redraw();
syncPoints(true);
return;
}
points.length = points.length - 1;
drawHelper.redraw();
syncPoints(true);
return;
}
if (points[index]) {
var newPoints = [];
for (var i = 0; i < points.length; i++) {
if (i !== index) {
newPoints.push(points[i]);
}
}
points = newPoints;
drawHelper.redraw();
syncPoints(true);
}
return;
}
if (event.data.syncPoints) {
syncPoints(true);
return;
}
if (event.data.clearCanvas) {
points = [];
drawHelper.redraw();
return;
}
if (!event.data.canvasDesignerSyncData) return;
// drawing is shared here (array of points)
var d = event.data.canvasDesignerSyncData;
if (d.startIndex !== 0) {
for (var i = 0; i < d.points.length; i++) {
points[i + d.startIndex] = d.points[i];
}
} else {
points = d.points;
}
lastPointIndex = points.length;
// redraw the <canvas> surfaces
drawHelper.redraw();
}, false);
function syncPoints(isSyncAll) {
if (isSyncAll) {
lastPointIndex = 0;
}
if (lastPointIndex == points.length) return;
var pointsToShare = [];
for (var i = lastPointIndex; i < points.length; i++) {
pointsToShare[i - lastPointIndex] = points[i];
}
if (pointsToShare.length) {
syncData({
points: pointsToShare || [],
startIndex: lastPointIndex
});
}
if (!pointsToShare.length && points.length) return;
lastPointIndex = points.length;
}
function syncData(data) {
window.parent.postMessage({
canvasDesignerSyncData: data,
uid: uid
}, '*');
}