mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-09-19 18:59:42 +00:00
170 lines
5.0 KiB
JavaScript
170 lines
5.0 KiB
JavaScript
/*\
|
|
title: $:/core/modules/macros/edit/editors/bitmapeditor.js
|
|
type: application/javascript
|
|
module-type: editor
|
|
|
|
An editor plugin for editting bitmaps
|
|
|
|
\*/
|
|
(function(){
|
|
|
|
/*jslint node: true, browser: true */
|
|
/*global $tw: false */
|
|
"use strict";
|
|
|
|
function BitmapEditor(macroNode) {
|
|
this.macroNode = macroNode;
|
|
}
|
|
|
|
BitmapEditor.prototype.getChildren = function() {
|
|
return [$tw.Tree.Element("canvas",{
|
|
"class": ["tw-edit-field"]
|
|
},[])];
|
|
};
|
|
|
|
BitmapEditor.prototype.postRenderInDom = function() {
|
|
var tiddler = this.macroNode.wiki.getTiddler(this.macroNode.tiddlerTitle),
|
|
canvas = this.macroNode.children[0].domNode,
|
|
currImage = new Image();
|
|
// Set the macro node itself to be position: relative
|
|
this.macroNode.domNode.style.position = "relative";
|
|
// Get the current bitmap into an image object
|
|
currImage.src = "data:" + tiddler.fields.type + ";base64," + tiddler.fields.text;
|
|
// Copy it to the on-screen canvas
|
|
canvas.width = currImage.width;
|
|
canvas.height = currImage.height;
|
|
var ctx = canvas.getContext("2d");
|
|
ctx.drawImage(currImage,0,0);
|
|
// And also copy the current bitmap to the off-screen canvas
|
|
this.currCanvas = document.createElement("canvas");
|
|
this.currCanvas.width = currImage.width;
|
|
this.currCanvas.height = currImage.height;
|
|
ctx = this.currCanvas.getContext("2d");
|
|
ctx.drawImage(currImage,0,0);
|
|
};
|
|
|
|
BitmapEditor.prototype.addEventHandlers = function() {
|
|
var self = this;
|
|
this.macroNode.domNode.addEventListener("touchstart",function(event) {
|
|
self.brushDown = true;
|
|
self.strokeStart(event.touches[0].clientX,event.touches[0].clientY);
|
|
event.preventDefault();
|
|
event.stopPropagation();
|
|
return false;
|
|
},false);
|
|
this.macroNode.domNode.addEventListener("touchmove",function(event) {
|
|
if(self.brushDown) {
|
|
self.strokeMove(event.touches[0].clientX,event.touches[0].clientY);
|
|
}
|
|
event.preventDefault();
|
|
event.stopPropagation();
|
|
return false;
|
|
},false);
|
|
this.macroNode.domNode.addEventListener("touchend",function(event) {
|
|
if(self.brushDown) {
|
|
self.brushDown = false;
|
|
self.strokeEnd();
|
|
}
|
|
event.preventDefault();
|
|
event.stopPropagation();
|
|
return false;
|
|
},false);
|
|
this.macroNode.domNode.addEventListener("mousedown",function(event) {
|
|
self.strokeStart(event.clientX,event.clientY);
|
|
self.brushDown = true;
|
|
event.preventDefault();
|
|
event.stopPropagation();
|
|
return false;
|
|
},false);
|
|
this.macroNode.domNode.addEventListener("mousemove",function(event) {
|
|
if(self.brushDown) {
|
|
self.strokeMove(event.clientX,event.clientY);
|
|
event.preventDefault();
|
|
event.stopPropagation();
|
|
return false;
|
|
}
|
|
},false);
|
|
this.macroNode.domNode.addEventListener("mouseup",function(event) {
|
|
if(self.brushDown) {
|
|
self.brushDown = false;
|
|
self.strokeEnd();
|
|
event.preventDefault();
|
|
event.stopPropagation();
|
|
return false;
|
|
}
|
|
return true;
|
|
},false);
|
|
};
|
|
|
|
BitmapEditor.prototype.adjustCoordinates = function(x,y) {
|
|
var canvas = this.macroNode.children[0].domNode,
|
|
canvasRect = canvas.getBoundingClientRect(),
|
|
scale = canvas.width/canvasRect.width;
|
|
return {x: (x - canvasRect.left) * scale, y: (y - canvasRect.top) * scale};
|
|
};
|
|
|
|
BitmapEditor.prototype.strokeStart = function(x,y) {
|
|
// Start off a new stroke
|
|
this.stroke = [this.adjustCoordinates(x,y)];
|
|
};
|
|
|
|
BitmapEditor.prototype.strokeMove = function(x,y) {
|
|
var canvas = this.macroNode.children[0].domNode,
|
|
ctx = canvas.getContext("2d"),
|
|
t;
|
|
// Add the new position to the end of the stroke
|
|
this.stroke.push(this.adjustCoordinates(x,y));
|
|
// Redraw the previous image
|
|
ctx.drawImage(this.currCanvas,0,0);
|
|
// Render the stroke
|
|
ctx.lineWidth = 3;
|
|
ctx.lineCap = "round";
|
|
ctx.lineJoin = "round";
|
|
ctx.beginPath();
|
|
ctx.moveTo(this.stroke[0].x,this.stroke[0].y);
|
|
for(t=1; t<this.stroke.length-1; t++) {
|
|
var s1 = this.stroke[t],
|
|
s2 = this.stroke[t-1],
|
|
tx = (s1.x + s2.x)/2,
|
|
ty = (s1.y + s2.y)/2;
|
|
ctx.quadraticCurveTo(s2.x,s2.y,tx,ty);
|
|
}
|
|
ctx.stroke();
|
|
};
|
|
|
|
BitmapEditor.prototype.strokeEnd = function() {
|
|
// Copy the bitmap to the off-screen canvas
|
|
var canvas = this.macroNode.children[0].domNode,
|
|
ctx = this.currCanvas.getContext("2d");
|
|
ctx.drawImage(canvas,0,0);
|
|
// Save the image into the tiddler
|
|
this.saveChanges();
|
|
};
|
|
|
|
BitmapEditor.prototype.saveChanges = function() {
|
|
var tiddler = this.macroNode.wiki.getTiddler(this.macroNode.tiddlerTitle);
|
|
if(tiddler) {
|
|
// data URIs look like "data:<type>;base64,<text>"
|
|
var dataURL = this.macroNode.children[0].domNode.toDataURL(tiddler.fields.type,1.0),
|
|
posColon = dataURL.indexOf(":"),
|
|
posSemiColon = dataURL.indexOf(";"),
|
|
posComma = dataURL.indexOf(","),
|
|
type = dataURL.substring(posColon+1,posSemiColon),
|
|
text = dataURL.substring(posComma+1);
|
|
var update = {type: type, text: text};
|
|
this.macroNode.wiki.addTiddler(new $tw.Tiddler(tiddler,update));
|
|
}
|
|
};
|
|
|
|
BitmapEditor.prototype.isRefreshable = function() {
|
|
// Don't ever refresh the bitmap editor
|
|
return false;
|
|
};
|
|
|
|
exports["image/jpg"] = BitmapEditor;
|
|
exports["image/jpeg"] = BitmapEditor;
|
|
exports["image/png"] = BitmapEditor;
|
|
exports["image/gif"] = BitmapEditor;
|
|
|
|
})();
|