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151
Controls/Paint/Painter.js
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151
Controls/Paint/Painter.js
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////////////////////////////////////////////////////////////
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//// © Microsoft. All rights reserved. ////
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////////////////////////////////////////////////////////////
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(function (AppNS) {
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'use strict';
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var Painter = WinJS.Class.define(
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// Constructor
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function (domCanvas) {
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this.paths = []; // The set of paths being built from
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this.pathCounted = []; // Array of boolean flags to tell if a path has been counted or not
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this.pathCount = 0; // Current count of active paths (number of fingers on the canvas)
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this.toolName = "marker"; // The currently selected tool's name
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this.tools = {}; // All of the tools used by this Painter
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this.canvas = new AppNS.Painter.Graphics.Canvas(domCanvas); // The current canvas this Painter is attached to
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this._currentColor = new AppNS.Painter.Graphics.Color(0,0,0,1); // The current color selected
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this.loadTool(new AppNS.Painter.Tools.Marker(), "marker"); // Every Painter has the Marker by default
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},
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// Variables and Functions
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{
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// The currently selected tool
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tool: {
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get: function () {
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if (this.tools.hasOwnProperty(this.toolName)) {
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return this.tools[this.toolName];
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} else {
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return null;
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}
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},
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set: function (newTool) {
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if (this.tools.hasOwnProperty(newTool)) {
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this.toolName = newTool;
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} else {
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throw new Error("PaintPlay - Error: No such tool.");
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}
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}
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},
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color: {
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get: function () {
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return this._currentColor;
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},
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set: function (newColor) {
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this._currentColor.fromColor(newColor);
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this.updateTools();
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}
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},
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updateTools: function () {
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for (var tool in this.tools){
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if (this.tools[tool].update) {
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this.tools[tool].update(this);
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}
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}
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},
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// Adds the given tool with the given string name to the Painter.
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// Default Painter has only a marker (simple line drawer).
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loadTool: function (tool, name) {
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this.tools[name] = tool;
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this.updateTools();
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},
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/// <summary>
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/// Begins drawing the path with the current tool.
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/// </summary>
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/// <param name="data" type="data">
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/// The data parameter is an object with the following properties:
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/// - x (required, number): the x position on the canvas
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/// - y (required, number): the y position on the canvas
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/// - w (optional, number from [0, inf)): the width of the touch input box
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/// - h (optional, number from [0, inf)): the height of the touch input box
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/// - id (optional, number): the ID of this path, usually taken from the touch input's pointerId
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/// </param>
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drawStart: function (data) {
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if (this.canvas) {
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var id = data.id || 0;
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this.paths[id] = new AppNS.Painter.Graphics.Path(data);
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this.pathCounted[id] = false;
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if (this.tool.renderStart) {
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this.tool.renderStart(this.paths[id], this);
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}
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}
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},
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/// <summary>
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/// Begins drawing the path with the current tool.
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/// </summary>
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/// <param name="data" type="data">
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/// The data parameter is an object with the following properties:
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/// - x (required, number): the x position on the canvas
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/// - y (required, number): the y position on the canvas
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/// - w (optional, number from [0, inf)): the width of the touch input box
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/// - h (optional, number from [0, inf)): the height of the touch input box
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/// - id (optional, number): the ID of this path, usually taken from the touch input's pointerId
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/// </param>
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draw: function (data) {
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var id = data.id || 0;
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var path = this.paths[id];
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if (!this.pathCounted[id]) {
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this.pathCount++;
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this.pathCounted[id] = true;
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}
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if (path && this.canvas) {
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path.addPoint(data);
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this.tool.render(path, this);
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}
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},
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/// <summary>
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/// Begins drawing the path with the current tool.
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/// </summary>
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/// <param name="data" type="data">
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/// The data parameter is an object with the following properties:
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/// - x (required, number): the x position on the canvas
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/// - y (required, number): the y position on the canvas
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/// - w (optional, number from [0, inf)): the width of the touch input box
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/// - h (optional, number from [0, inf)): the height of the touch input box
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/// - id (optional, number): the ID of this path, usually taken from the touch input's pointerId
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/// </param>
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drawStop: function (data) {
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var id = data.id || 0;
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var path = this.paths[id];
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if (path && this.canvas) {
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path.addPoint(data);
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if (this.pathCounted[id]) {
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this.pathCount--;
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this.pathCounted[id] = false;
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}
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this.tool.render(path, this);
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if (this.tool.renderStop) {
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this.tool.renderStop(path, this);
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}
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if (this.pathCount === 0) {
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this.canvas.saveState();
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}
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}
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}
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}
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);
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WinJS.Namespace.defineWithParent(AppNS, "Painter", {
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Painter: Painter
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});
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})(Microsoft.Paint);
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