mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-08-19 22:26:18 +00:00
167 lines
4.9 KiB
JavaScript
167 lines
4.9 KiB
JavaScript
/*\
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title: $:/core/modules/macros/edit/editors/bitmapeditor.js
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type: application/javascript
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module-type: editor
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\*/
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(function(){
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/*jslint node: true, browser: true */
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"use strict";
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function BitmapEditor(macroNode) {
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this.macroNode = macroNode;
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}
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BitmapEditor.prototype.getChildren = function() {
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return [$tw.Tree.Element("canvas",{
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"class": ["tw-edit-field"]
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},[])];
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};
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BitmapEditor.prototype.postRenderInDom = function() {
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var tiddler = this.macroNode.wiki.getTiddler(this.macroNode.tiddlerTitle),
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canvas = this.macroNode.children[0].domNode,
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currImage = new Image();
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// Set the macro node itself to be position: relative
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this.macroNode.domNode.style.position = "relative";
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// Get the current bitmap into an image object
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currImage.src = "data:" + tiddler.fields.type + ";base64," + tiddler.fields.text;
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// Copy it to the on-screen canvas
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canvas.width = currImage.width;
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canvas.height = currImage.height;
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var ctx = canvas.getContext("2d");
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ctx.drawImage(currImage,0,0);
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// And also copy the current bitmap to the off-screen canvas
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this.currCanvas = document.createElement("canvas");
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this.currCanvas.width = currImage.width;
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this.currCanvas.height = currImage.height;
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ctx = this.currCanvas.getContext("2d");
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ctx.drawImage(currImage,0,0);
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};
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BitmapEditor.prototype.addEventHandlers = function() {
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var self = this;
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this.macroNode.domNode.addEventListener("touchstart",function(event) {
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self.brushDown = true;
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self.strokeStart(event.touches[0].clientX,event.touches[0].clientY);
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event.preventDefault();
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event.stopPropagation();
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return false;
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},false);
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this.macroNode.domNode.addEventListener("touchmove",function(event) {
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if(self.brushDown) {
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self.strokeMove(event.touches[0].clientX,event.touches[0].clientY);
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}
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event.preventDefault();
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event.stopPropagation();
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return false;
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},false);
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this.macroNode.domNode.addEventListener("touchend",function(event) {
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if(self.brushDown) {
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self.brushDown = false;
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self.strokeEnd();
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}
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event.preventDefault();
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event.stopPropagation();
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return false;
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},false);
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this.macroNode.domNode.addEventListener("mousedown",function(event) {
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self.strokeStart(event.clientX,event.clientY);
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self.brushDown = true;
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event.preventDefault();
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event.stopPropagation();
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return false;
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},false);
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this.macroNode.domNode.addEventListener("mousemove",function(event) {
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if(self.brushDown) {
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self.strokeMove(event.clientX,event.clientY);
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event.preventDefault();
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event.stopPropagation();
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return false;
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}
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},false);
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this.macroNode.domNode.addEventListener("mouseup",function(event) {
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if(self.brushDown) {
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self.brushDown = false;
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self.strokeEnd();
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event.preventDefault();
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event.stopPropagation();
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return false;
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}
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return true;
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},false);
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};
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BitmapEditor.prototype.adjustCoordinates = function(x,y) {
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var canvas = this.macroNode.children[0].domNode,
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canvasRect = canvas.getBoundingClientRect(),
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scale = canvas.width/canvasRect.width;
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return {x: (x - canvasRect.left) * scale, y: (y - canvasRect.top) * scale};
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};
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BitmapEditor.prototype.strokeStart = function(x,y) {
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// Start off a new stroke
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this.stroke = [this.adjustCoordinates(x,y)];
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};
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BitmapEditor.prototype.strokeMove = function(x,y) {
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var canvas = this.macroNode.children[0].domNode,
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ctx = canvas.getContext("2d"),
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t;
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// Add the new position to the end of the stroke
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this.stroke.push(this.adjustCoordinates(x,y));
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// Redraw the previous image
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ctx.drawImage(this.currCanvas,0,0);
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// Render the stroke
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ctx.lineWidth = 3;
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ctx.lineCap = "round";
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ctx.lineJoin = "round";
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ctx.beginPath();
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ctx.moveTo(this.stroke[0].x,this.stroke[0].y);
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for(t=1; t<this.stroke.length-1; t++) {
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var s1 = this.stroke[t],
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s2 = this.stroke[t-1],
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tx = (s1.x + s2.x)/2,
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ty = (s1.y + s2.y)/2;
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ctx.quadraticCurveTo(s2.x,s2.y,tx,ty);
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}
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ctx.stroke();
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};
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BitmapEditor.prototype.strokeEnd = function() {
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// Copy the bitmap to the off-screen canvas
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var canvas = this.macroNode.children[0].domNode,
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ctx = this.currCanvas.getContext("2d");
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ctx.drawImage(canvas,0,0);
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// Save the image into the tiddler
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this.saveChanges();
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};
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BitmapEditor.prototype.saveChanges = function() {
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var tiddler = this.macroNode.wiki.getTiddler(this.macroNode.tiddlerTitle);
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if(tiddler) {
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// data URIs look like "data:<type>;base64,<text>"
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var dataURL = this.macroNode.children[0].domNode.toDataURL(tiddler.fields.type,1.0),
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posColon = dataURL.indexOf(":"),
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posSemiColon = dataURL.indexOf(";"),
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posComma = dataURL.indexOf(","),
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type = dataURL.substring(posColon+1,posSemiColon),
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text = dataURL.substring(posComma+1);
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var update = {type: type, text: text};
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this.macroNode.wiki.addTiddler(new $tw.Tiddler(tiddler,update));
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}
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};
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BitmapEditor.prototype.isRefreshable = function() {
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// Don't ever refresh the bitmap editor
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return false;
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};
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exports["image/jpg"] = BitmapEditor;
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exports["image/jpeg"] = BitmapEditor;
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exports["image/png"] = BitmapEditor;
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exports["image/gif"] = BitmapEditor;
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})();
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