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given <canvas id="canvas"></canvas> allow the user to draw on the canvas
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.2/jquery.min.js"></script> | |
| <meta charset=utf-8 /> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <canvas id="canvas" style="border: 1px solid black;"></canvas> | |
| <p> | |
| <button id="Clear">Clear</button> | |
| <button id="Penups">Penups</button> | |
| <button id="Points">Points</button> | |
| </p> | |
| </body> | |
| <script> | |
| var penTool = new PenTool('#canvas'); | |
| var topazTool = new TopazTool('#canvas'); | |
| $("#Clear").click(function () { | |
| penTool.Clear(); | |
| topazTool.Clear(); | |
| }); | |
| $("#Penups").click(function() { | |
| alert(topazTool.Penups().length); | |
| }); | |
| $("#Points").click(function() { | |
| alert(topazTool.Points().length); | |
| }); | |
| </script> | |
| </html> |
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| var DT = (function(dt, $) { | |
| dt.PenTool = function(id) { | |
| var canvas = $(id); | |
| var context = canvas[0].getContext("2d"); | |
| var isMouseDown = false; | |
| canvas.mousedown(function (e) { | |
| isMouseDown = true; | |
| context.moveTo(e.offsetX, e.offsetY); | |
| }).mouseup(function() { | |
| isMouseDown = false; | |
| }).mousemove(function(e) { | |
| if (isMouseDown) { | |
| context.lineTo(e.offsetX, e.offsetY); | |
| context.stroke(); | |
| } | |
| }); | |
| this.Clear = function() { | |
| context.clearRect(0, 0, canvas.width(), canvas.height()); | |
| context.beginPath(); | |
| }; | |
| }; | |
| }) (DT || {}, jQuery); |
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| var DT = (function(dt, $) { | |
| dt.TopazTool = function(id) { | |
| var canvas = $(id); | |
| var isMouseDown = false; | |
| var points = []; | |
| var penups = []; | |
| canvas.mousedown(function (e) { | |
| isMouseDown = true; | |
| points.push({ X: e.offsetX, Y: e.offsetY }); | |
| }).mouseup(function() { | |
| isMouseDown = false; | |
| penups.push(points.length); | |
| }).mousemove(function(e) { | |
| if (isMouseDown) { | |
| points.push({ X: e.offsetX, Y: e.offsetY }); | |
| } | |
| }); | |
| this.Clear = function() { | |
| points = []; | |
| penups = []; | |
| }; | |
| this.Points = function() { | |
| return points; | |
| } | |
| this.Penups = function() { | |
| return penups; | |
| } | |
| }; | |
| }) (DT || {}, jQuery); |
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