Created
January 20, 2014 15:15
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| function main(){ | |
| var context = document.getElementById('myCanvas').getContext('2d'); | |
| var painter = new Painter(context); | |
| painter.setFillColor(255,0,0,1); | |
| painter.drawText("Text 1", 50); | |
| painter.pushState(); | |
| painter.rotate(320, 100, 45); | |
| painter.setFillColor(0,0,255,1); | |
| painter.drawText("Text 2", 100); | |
| painter.popState(); | |
| painter.drawText("Text 3", 150); | |
| } | |
| function Painter(ctx){ | |
| var context = ctx; | |
| var DEG2RAD = Math.PI/180.0; | |
| var center = {}; | |
| var init = function(ctx){ | |
| context = ctx; | |
| center[0] = context.canvas.width/2; | |
| center[1] = context.canvas.height/2; | |
| }; | |
| this.pushState = function(){ | |
| context.save(); | |
| }; | |
| this.popState = function(){ | |
| context.restore(); | |
| }; | |
| this.rotate = function(posX, posY, angle){ | |
| context.translate(posX, posY); | |
| context.rotate(angle * DEG2RAD); | |
| context.translate(-posX, -posY); | |
| }; | |
| this.setFillColor = function(r,g,b,a){ | |
| context.fillStyle = "rgba(" + r + "," + g + "," + b + "," + a +")"; | |
| }; | |
| this.drawText = function(text, ypos){ | |
| context.font = "30px Arial"; | |
| context.textAlign = "center"; | |
| context.fillText(text, center[0], ypos); | |
| }; | |
| init(ctx); | |
| } |
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