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TiddlyWiki5/core/modules/widgets/edit-bitmap.js

344 lines
11 KiB
JavaScript

/*\
title: $:/core/modules/widgets/edit-bitmap.js
type: application/javascript
module-type: widget
Edit-bitmap widget
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
// Default image sizes
var DEFAULT_IMAGE_WIDTH = 600,
DEFAULT_IMAGE_HEIGHT = 370,
DEFAULT_IMAGE_TYPE = "image/png";
// Configuration tiddlers
var LINE_WIDTH_TITLE = "$:/config/BitmapEditor/LineWidth",
LINE_COLOUR_TITLE = "$:/config/BitmapEditor/Colour",
LINE_OPACITY_TITLE = "$:/config/BitmapEditor/Opacity";
var Widget = require("$:/core/modules/widgets/widget.js").widget;
var EditBitmapWidget = function(parseTreeNode,options) {
this.initialise(parseTreeNode,options);
};
/*
Inherit from the base widget class
*/
EditBitmapWidget.prototype = new Widget();
/*
Render this widget into the DOM
*/
EditBitmapWidget.prototype.render = function(parent,nextSibling) {
var self = this;
// Initialise the editor operations if they've not been done already
if(!this.editorOperations) {
EditBitmapWidget.prototype.editorOperations = {};
$tw.modules.applyMethods("bitmapeditoroperation",this.editorOperations);
}
// Save the parent dom node
this.parentDomNode = parent;
// Compute our attributes
this.computeAttributes();
// Execute our logic
this.execute();
// Create the wrapper for the toolbar and render its content
this.toolbarNode = this.document.createElement("div");
this.toolbarNode.className = "tc-editor-toolbar";
parent.insertBefore(this.toolbarNode,nextSibling);
this.domNodes.push(this.toolbarNode);
// Create the on-screen canvas
this.canvasDomNode = $tw.utils.domMaker("canvas",{
document: this.document,
"class":"tc-edit-bitmapeditor",
eventListeners: [{
name: "touchstart", handlerObject: this, handlerMethod: "handleTouchStartEvent"
},{
name: "touchmove", handlerObject: this, handlerMethod: "handleTouchMoveEvent"
},{
name: "touchend", handlerObject: this, handlerMethod: "handleTouchEndEvent"
},{
name: "mousedown", handlerObject: this, handlerMethod: "handleMouseDownEvent"
},{
name: "mousemove", handlerObject: this, handlerMethod: "handleMouseMoveEvent"
},{
name: "mouseup", handlerObject: this, handlerMethod: "handleMouseUpEvent"
}]
});
// Set the width and height variables
this.setVariable("tv-bitmap-editor-width",this.canvasDomNode.width + "px");
this.setVariable("tv-bitmap-editor-height",this.canvasDomNode.height + "px");
// Render toolbar child widgets
this.renderChildren(this.toolbarNode,null);
// // Insert the elements into the DOM
parent.insertBefore(this.canvasDomNode,nextSibling);
this.domNodes.push(this.canvasDomNode);
// Load the image into the canvas
if($tw.browser) {
this.loadCanvas();
}
// Add widget message listeners
this.addEventListeners([
{type: "tm-edit-bitmap-operation", handler: "handleEditBitmapOperationMessage"}
]);
};
/*
Handle an edit bitmap operation message from the toolbar
*/
EditBitmapWidget.prototype.handleEditBitmapOperationMessage = function(event) {
// Invoke the handler
var handler = this.editorOperations[event.param];
if(handler) {
handler.call(this,event);
}
};
/*
Compute the internal state of the widget
*/
EditBitmapWidget.prototype.execute = function() {
// Get our parameters
this.editTitle = this.getAttribute("tiddler",this.getVariable("currentTiddler"));
// Make the child widgets
this.makeChildWidgets();
};
/*
Just refresh the toolbar
*/
EditBitmapWidget.prototype.refresh = function(changedTiddlers) {
return this.refreshChildren(changedTiddlers);
};
/*
Set the bitmap size variables and refresh the toolbar
*/
EditBitmapWidget.prototype.refreshToolbar = function() {
// Set the width and height variables
this.setVariable("tv-bitmap-editor-width",this.canvasDomNode.width + "px");
this.setVariable("tv-bitmap-editor-height",this.canvasDomNode.height + "px");
// Refresh each of our child widgets
$tw.utils.each(this.children,function(childWidget) {
childWidget.refreshSelf();
});
};
EditBitmapWidget.prototype.loadCanvas = function() {
var tiddler = this.wiki.getTiddler(this.editTitle),
currImage = new Image();
// Set up event handlers for loading the image
var self = this;
currImage.onload = function() {
// Copy the image to the on-screen canvas
self.initCanvas(self.canvasDomNode,currImage.width,currImage.height,currImage);
// And also copy the current bitmap to the off-screen canvas
self.currCanvas = self.document.createElement("canvas");
self.initCanvas(self.currCanvas,currImage.width,currImage.height,currImage);
// Set the width and height input boxes
self.refreshToolbar();
};
currImage.onerror = function() {
// Set the on-screen canvas size and clear it
self.initCanvas(self.canvasDomNode,DEFAULT_IMAGE_WIDTH,DEFAULT_IMAGE_HEIGHT);
// Set the off-screen canvas size and clear it
self.currCanvas = self.document.createElement("canvas");
self.initCanvas(self.currCanvas,DEFAULT_IMAGE_WIDTH,DEFAULT_IMAGE_HEIGHT);
// Set the width and height input boxes
self.refreshToolbar();
};
// Get the current bitmap into an image object
if(tiddler && tiddler.fields.type && tiddler.fields.text) {
currImage.src = "data:" + tiddler.fields.type + ";base64," + tiddler.fields.text;
} else {
currImage.width = DEFAULT_IMAGE_WIDTH;
currImage.height = DEFAULT_IMAGE_HEIGHT;
currImage.onerror();
}
};
EditBitmapWidget.prototype.initCanvas = function(canvas,width,height,image) {
canvas.width = width;
canvas.height = height;
var ctx = canvas.getContext("2d");
if(image) {
ctx.drawImage(image,0,0);
} else {
ctx.fillStyle = "#fff";
ctx.fillRect(0,0,canvas.width,canvas.height);
}
};
/*
** Change the size of the canvas, preserving the current image
*/
EditBitmapWidget.prototype.changeCanvasSize = function(newWidth,newHeight) {
// Create and size a new canvas
var newCanvas = this.document.createElement("canvas");
this.initCanvas(newCanvas,newWidth,newHeight);
// Copy the old image
var ctx = newCanvas.getContext("2d");
ctx.drawImage(this.currCanvas,0,0);
// Set the new canvas as the current one
this.currCanvas = newCanvas;
// Set the size of the onscreen canvas
this.canvasDomNode.width = newWidth;
this.canvasDomNode.height = newHeight;
// Paint the onscreen canvas with the offscreen canvas
ctx = this.canvasDomNode.getContext("2d");
ctx.drawImage(this.currCanvas,0,0);
};
/*
** Rotate the canvas left by 90 degrees
*/
EditBitmapWidget.prototype.rotateCanvasLeft = function() {
// Get the current size of the image
var origWidth = this.currCanvas.width,
origHeight = this.currCanvas.height;
// Create and size a new canvas
var newCanvas = this.document.createElement("canvas"),
newWidth = origHeight,
newHeight = origWidth;
this.initCanvas(newCanvas,newWidth,newHeight);
// Copy the old image
var ctx = newCanvas.getContext("2d");
ctx.save();
ctx.translate(newWidth / 2,newHeight / 2);
ctx.rotate(-Math.PI / 2);
ctx.drawImage(this.currCanvas,-origWidth / 2,-origHeight / 2);
ctx.restore();
// Set the new canvas as the current one
this.currCanvas = newCanvas;
// Set the size of the onscreen canvas
this.canvasDomNode.width = newWidth;
this.canvasDomNode.height = newHeight;
// Paint the onscreen canvas with the offscreen canvas
ctx = this.canvasDomNode.getContext("2d");
ctx.drawImage(this.currCanvas,0,0);
};
EditBitmapWidget.prototype.handleTouchStartEvent = function(event) {
this.brushDown = true;
this.strokeStart(event.touches[0].clientX,event.touches[0].clientY);
event.preventDefault();
event.stopPropagation();
return false;
};
EditBitmapWidget.prototype.handleTouchMoveEvent = function(event) {
if(this.brushDown) {
this.strokeMove(event.touches[0].clientX,event.touches[0].clientY);
}
event.preventDefault();
event.stopPropagation();
return false;
};
EditBitmapWidget.prototype.handleTouchEndEvent = function(event) {
if(this.brushDown) {
this.brushDown = false;
this.strokeEnd();
}
event.preventDefault();
event.stopPropagation();
return false;
};
EditBitmapWidget.prototype.handleMouseDownEvent = function(event) {
this.strokeStart(event.clientX,event.clientY);
this.brushDown = true;
event.preventDefault();
event.stopPropagation();
return false;
};
EditBitmapWidget.prototype.handleMouseMoveEvent = function(event) {
if(this.brushDown) {
this.strokeMove(event.clientX,event.clientY);
event.preventDefault();
event.stopPropagation();
return false;
}
return true;
};
EditBitmapWidget.prototype.handleMouseUpEvent = function(event) {
if(this.brushDown) {
this.brushDown = false;
this.strokeEnd();
event.preventDefault();
event.stopPropagation();
return false;
}
return true;
};
EditBitmapWidget.prototype.adjustCoordinates = function(x,y) {
var canvasRect = this.canvasDomNode.getBoundingClientRect(),
scale = this.canvasDomNode.width/canvasRect.width;
return {x: (x - canvasRect.left) * scale, y: (y - canvasRect.top) * scale};
};
EditBitmapWidget.prototype.strokeStart = function(x,y) {
// Start off a new stroke
this.stroke = [this.adjustCoordinates(x,y)];
};
EditBitmapWidget.prototype.strokeMove = function(x,y) {
var ctx = this.canvasDomNode.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.globalAlpha = parseFloat(this.wiki.getTiddlerText(LINE_OPACITY_TITLE,"1.0"));
ctx.strokeStyle = this.wiki.getTiddlerText(LINE_COLOUR_TITLE,"#ff0");
ctx.lineWidth = parseFloat(this.wiki.getTiddlerText(LINE_WIDTH_TITLE,"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();
};
EditBitmapWidget.prototype.strokeEnd = function() {
// Copy the bitmap to the off-screen canvas
var ctx = this.currCanvas.getContext("2d");
ctx.drawImage(this.canvasDomNode,0,0);
// Save the image into the tiddler
this.saveChanges();
};
EditBitmapWidget.prototype.saveChanges = function() {
var tiddler = this.wiki.getTiddler(this.editTitle) || new $tw.Tiddler({title: this.editTitle,type: DEFAULT_IMAGE_TYPE});
// data URIs look like "data:<type>;base64,<text>"
var dataURL = this.canvasDomNode.toDataURL(tiddler.fields.type),
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.wiki.addTiddler(new $tw.Tiddler(this.wiki.getModificationFields(),tiddler,update,this.wiki.getCreationFields()));
};
exports["edit-bitmap"] = EditBitmapWidget;
})();