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samples.htm
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samples.htm
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<!DOCTYPE html>
<html manifest="data.appcache">
<head>
<meta charset="utf-8">
<title>Breakout</title>
<meta name="description" content="Time Game">
<meta name="author" content="Andrew Ippoliti">
<!-- IN ANDROID BROWSER - enter "about:debug" in the address bar
It should give you some extra options and a 'js console' -->
<!-- Mobile viewport optimization http://goo.gl/b9SaQ -->
<meta name="HandheldFriendly" content="True">
<meta name="MobileOptimized" content="320">
<!--<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=10.0;">-->
<!--<meta name="viewport" content="width=device-width, height=device-height, user-scalable=no" />-->
<meta name="viewport" content="width=320, height=320, user-scalable=no" />
<!-- Hide browser chrome (iOS only) -->
<meta name="apple-mobile-web-app-capable" content="yes" />
<!-- Supposedly style the status bar -->
<meta name="apple-mobile-web-app-status-bar-style" content="black" />
<style type="text/css">
html, body, canvas {
margin: 0px;
/* disable selections */
-webkit-user-select: none;
/* disable callout, image save panel on long press */
-webkit-touch-callout: none;
/* make highlighting transparent */
-webkit-tap-highlight-color: transparent;
}
.preview-module {
padding: 16px;
margin: 32px;
text-align: center;
vertical-align: middle;
border: 1px solid #000;
border-radius: 4px;
}
.preview-module .text {
display: inline-block;
width: 60%;
text-align: center;
vertical-align: middle;
}
.preview-module canvas {
text-align: center;
vertical-align: middle;
border: 1px dashed #000;
margin: 3%;
}
.preview-module .text pre {
float: left;
text-align: left;
vertical-align: middle;
clear: left;
padding-top: 1em;
}
.preview-module .text textarea {
float: left;
text-align: left;
vertical-align: middle;
clear: left;
margin-top: 1em;
width: 90%;
min-height: 3em;
}
.preview-module .text a {
float: left;
text-align: left;
width:100%;
display:block;
font-weight: bold;
font-size: 2em;
}
.preview-module .text .desc {
float: left;
text-align: left;
vertical-align: middle;
display: block;
}
</style>
</head>
<body>
<!--
<div id="div-main" style="position:absolute; width: 128px; height: 128px;">
<canvas id="canvas-main" width=128 height=128 style="border: 1px dashed #000"></canvas>
</div>
-->
<script type="text/javascript" src="./gfx.js"></script>
<script type="text/javascript" id="script-doc">
requestAnimFrame = (function(){
/// Compatibility for animation frame on older browsers
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(callback, element){
window.setTimeout(callback, 1000 / 60);
};
})();
// ------------------------------------------------------------- [ Simple Test ] -
var TemplateStatic = (function($gfx){
var mod = {};
mod.start = function(){
// Code here
}
return mod;
}($gfxlib));
var TemplateAnim = (function($gfx){
var mod = {};
mod.frameLastTime = 0;
mod.frameThisTime = 0;
mod.frameMaxDt = 0.5;
mod.update = function(){
// Compute the difference in time between this frame and the last.
mod.frameLastTime = mod.frameThisTime;
mod.frameThisTime = (new Date()).getTime();
// The times are in milliseconds: we /1000 to convert to seconds.
var dt = (mod.frameThisTime - mod.frameLastTime)*0.001;
if(dt > mod.frameMaxDt){ dt = mod.frameMaxDt; }
// Update Code Here
// setup another update
requestAnimFrame(mod.update);
}
mod.start = function(){
mod.frameLastTime = (new Date()).getTime();
mod.frameThisTime = mod.frameLastTime;
// Startup Code Here
requestAnimFrame(mod.update);
}
return mod;
}($gfxlib));
var ViewSetByCorners1 = (function($gfx){
var mod = {};
mod.start = function(){
$gfx.setCanvasNode(document.getElementById("canvas-main"));
$gfx.viewSetByCorners(0,0,30,30);
$gfx.drawRect(10,10,10,10);
}
return mod;
}($gfxlib));
var NewCanvas = (function($gfx){
var mod = {};
mod.start = function(){
var parentNode = document.getElementById("div-main");
var newNode = $gfxlib.createCanvasNode(parentNode,"canvas-id",0);
$gfx.setCanvasNode(newNode.domNode);
$gfx.drawRect(10,10,10,10);
}
return mod;
}($gfxlib));
DrawRect = {
name: "Rectangle",
code: "$gfxlib.drawRect(32,32,48,48);",
desc: "How to draw a retangle. The (left,top) corner is (32,32). \n"+
"The (width,height) is (32,32)."
};
SetStyle = {
name: "Color Styles",
code: "$gfxlib.setStyle('red','blue',1.0);\n"+
"$gfxlib.drawRect(64,64,64,64);",
desc: "Draws a rectangle that is filled red, stroked blue \n"+
"and has an alpha level of 1.0 (fully visible)."
};
SetLine = {
name: "Line Styles",
code: "$gfxlib.setStyle('red','blue',1.0);\n"+
"$gfxlib.setLineStyle(4,'round','round');\n"+
"$gfxlib.drawRect(64,64,64,64);",
desc: "The line is set to be 4 pixels wide. This line is capped with "+
"a 'round' cap but you may also use 'butt' or 'square'. "+
"Line segments are joined via a 'round' joint but you could "+
"use 'miter' or 'bevel'."
};
DrawRectCenter = {
name: "Centered Rectangle",
code: "$gfxlib.setStyle('red','red',1.0);\n"+
"$gfxlib.drawRect(64,64,64,64);\n"+
"$gfxlib.setStyle('blue','blue',1.0);\n"+
"$gfxlib.drawRectCenter(64,64,32,32);",
desc: "The blue rectangle is drawn with its center (x,y) "+
"at (64,64). Half of its width is 32; half of its "+
"height is 32."
};
BasicCircle = {
name: "Basic Circle",
code: "$gfxlib.setStyle('yellow','black',1.0);\n"+
"$gfxlib.drawCircle(64,32,16);",
desc: "The circle's center (x,y) is (64,32). It has a "+
"radius of 16."
};
GradientLinear = {
name: "Linear Gradient",
code: "var grad = $gfxlib.createGradientLinear(0,0,128,64,\n"+
" ['#FF0','red','#0000F9']);\n"+
"$gfxlib.setStyle(grad,'black',1.0);\n"+
"$gfxlib.drawRect(14,14,100,100);",
desc: "Linear gradients are defined with a starting x,y location "+
"(0,0), an ending x,y location (128,64), and an array of "+
"colors ['#FF0','red','#0000F9']. After the gradient (grad) "+
"has been defined it can be used a fill or stroke 'color'."
};
GradientRadial1 = {
name: "Radial Gradient 1",
code: "var grad = $gfxlib.createGradientRadial(64,64,16,64,64,32,\n"+
" ['#FF0','red','#0000F9']);\n"+
"$gfxlib.setStyle(grad,'black',1.0);\n"+
"$gfxlib.drawRect(14,14,100,100);",
desc: "Circular gradients are defined by 2 circles. The simplest "+
"case is when the circles have the same center (64,64). The "+
"radius (16) of the first circle should be smaller than the "+
"radius (32) of the outer circle. The list of colors goes "+
"from the inner circle to the outer circle."
};
GradientRadial2 = {
name: "Radial Gradient 2",
code: "var grad = $gfxlib.createGradientRadial(32,32,0,64,64,64,\n"+
" ['#0F0','#00F']);\n"+
"$gfxlib.setStyle(grad,'black',1.0);\n"+
"$gfxlib.drawRect(14,14,100,100);",
desc: "By moving the centers of the circles it is possible to "+
"achieve various effects. Note that the first circle smaller "+
"and is located to the upper left. The second circle is "+
"larger and defines an 'outer boundary' of sorts for the "+
"gradient. Make sure the outer circle is big enough; "+
"otherwise, you may not see a gradient."
};
Checkerboard = {
name: "Checkerboard",
code: "$gfxlib.setStyle('black','yellow',1.0);\n"+
"$gfxlib.drawCheckerBoard(0,0,16,16,8,8);",
desc: "You can make a nice checkerboard pattern. This example "+
"starts at (0,0). Each 'block' is 16 units wide and 16 "+
"units high. There are 8 'blocks' in a row and 8 "+
"'rows' of blocks."
};
ClearAll = {
name: "Clear All",
code: "$gfxlib.setStyle('black','yellow',1.0);\n"+
"$gfxlib.drawCheckerBoard(0,0,16,16,8,8);\n"+
"$gfxlib.drawClearAll();",
desc: "To get a blank canvas just use the clear all function. "+
"It will make the canvas transparent (until you draw "+
"over it)."
};
DrawStar = {
name: "Draw Star",
code: "$gfxlib.setStyle('yellow','#000',1.0);\n"+
"$gfxlib.drawStar(64,64,8,24,3,0);",
desc: "Stars have spokes. This star is centered at (x,y) (64,64). "+
"It has an inner radius of 8 and an outer radius or spoke "+
"length of 24. There are 3 spokes. The first spoke points "+
"toward 0 degrees"
};
DrawPoly = {
name: "Regular Polygon",
code: "$gfxlib.setStyle('#0F0','#000',1.0);\n"+
"$gfxlib.drawPoly(64,64,24,5,15);",
desc: "Regular polygons have sides or equal length and all of "+
"their vertecies are the same distance away from their "+
"center. This polygon is centered at (64,64). Its verticies "+
"are 24 units away from its center. It has 5 sides and its "+
"first vertex points toward 15 degrees."
};
InvertAll = {
name: "Invert all colors",
code: "var grad = $gfxlib.createGradientRadial(64,64,0,64,64,64,\n"+
" ['red','yellow','green','blue']);\n"+
"$gfxlib.setStyle(grad,'black',1.0);\n"+
"$gfxlib.drawRect(14,14,100,100);\n"+
"$gfxlib.filterApplyToAll($gfxlib.filterFuncInvert,{});",
desc: "Converting a photographic negative to a normal image is "+
"like inverting all of the colors of am image. Technically "+
"the pixels are being replaced by 255 minus the orginal "+
"pixel's color channel values. Red is 255 red, 0 green and "+
"0 blue; its negative is 0 red, 255 green and 255 blue."
};
Filters = {
name: "Filters",
code: "var grad = $gfxlib.createGradientRadial(64,64,0,64,64,64,\n"+
" ['red','yellow','green','blue']);\n"+
"$gfxlib.setStyle(grad,'black',1.0);\n"+
"$gfxlib.drawRect(14,14,100,100);\n"+
"$gfxlib.filterApplyToRegion(0,0,64,64,$gfxlib.filterFuncNoBlue,{});\n"+
"$gfxlib.filterApplyToRegion(64,0,64,64,$gfxlib.filterFuncNoRed,{});\n"+
"$gfxlib.filterApplyToRegion(0,64,64,64,$gfxlib.filterFuncNoGreen,{});\n",
desc: "You can use special filters to apply other effects."
};
InvertRegion = {
name: "Invert a region",
code: "var grad = $gfxlib.createGradientRadial(64,64,0,64,64,64,\n"+
" ['red','yellow','green','blue']);\n"+
"$gfxlib.setStyle(grad,'black',1.0);\n"+
"$gfxlib.drawRect(14,14,100,100);\n"+
"$gfxlib.filterApplyToRegion(0,0,64,128,$gfxlib.filterFuncInvert,{});\n"+
"$gfxlib.filterApplyToRegion(0,64,128,64,$gfxlib.filterFuncToLuma,{});",
desc: "You can just invert a specific region. This code inverts "+
"a region whose (top,left) corner is (0,0) and is 64 pixels "+
"wide by 128 pixels high."
};
FilterColorSwap = {
name: "Swap Colors",
code: "var grad = $gfxlib.createGradientRadial(64,64,0,64,64,64,\n"+
" ['red','yellow','green','blue']);\n"+
"$gfxlib.setStyle(grad,'black',1.0);\n"+
"$gfxlib.drawRect(14,14,100,100);\n"+
"$gfxlib.filterApplyToRegion(0,0,64,128,$gfxlib.filterFuncColorSwap,\n"+
"\t{fR:255,fG:0,fB:0,tR:0,tG:0,tB:255,minDist:45,maxDist:255});\n",
desc: "You can just invert a specific region. This code inverts "+
"a region whose (top,left) corner is (0,0) and is 64 pixels "+
"wide by 128 pixels high."
};
FilterHueShift = {
name: "Hue Shifting",
code: "var grad = $gfxlib.createGradientRadial(64,64,0,64,64,64,\n"+
" ['red','yellow','green','blue']);\n"+
"$gfxlib.setStyle(grad,'black',1.0);\n"+
"$gfxlib.drawRect(14,14,100,100);\n"+
"$gfxlib.filterApplyToRegion(0,0,64,128,$gfxlib.filterFuncShiftHue,\n"+
"\t{degrees:120});\n",
desc: "You can shift the hue of your image by a specific number "+
"of degrees."
};
Convolution = {
name: "3x3 Convolution",
code: "$gfxlib.setStyle('yellow','#000',1.0);\n"+
"$gfxlib.drawStar(32,64,8,24,5,0);\n"+
"$gfxlib.drawStar(96,64,8,24,5,0);\n"+
"$gfxlib.filterConvolve3x3(64,0,64,128,\n"+
"[1,1,1, 1,-7,1, 1,1,1]);\n",
desc: "You can use a general convultion matrix to apply some cool "+
"effects to an image like bluring, sharpening, embossing or "+
"even edge detection as shown in the example. The image on "+
"the right side 64 pixels wide, 128 pixels high, starting at "+
"(64,0) has been convolved with the shown matrix."
// http://docs.gimp.org/nl/plug-in-convmatrix.html
// blur [0.1,0.1,0.1, 0.1,0.1,0.1, 0.1,0.1,0.1]
// more blur [1,2,1, 2,4,2, 1,2,1]
// sharpen [0,-2,0, -2,11,-2, 0.0,-2,0.0]
// mean removal [-1,-1,-1, -1,9,-1, -1,-1,-1]
// emboss [-2,-1,0, -1,1,1, 0,1,2]
// lighten [0,0,0, 0,1.5,0, 0,0,0]
// darken [0,0,0, 0,1.5,0, 0,0,0]
// edge find [0,1,0, 1,-4,1, 0,1,0]
// edge detect [1,1,1, 1,-7,1, 1,1,1]
// edge detect 2 [-5,0,0, 0,0,0, 0,0,5]
};
FastConvolution = {
name: "Fast Convolution",
code: "$gfxlib.setStyle('yellow','#000',1.0);\n"+
"$gfxlib.drawStar(32,64,8,24,5,0);\n"+
"$gfxlib.drawStar(96,32,8,24,5,0);\n"+
"$gfxlib.drawStar(96,96,8,24,5,0);\n"+
"for( var i=0; i<20; i+=1 ){\n"+
" $gfxlib.filterFastConvolve3(64,0,64,64,[0.2,0.6,0.2]);\n"+
"}\n"+
"for( var i=0; i<20; i+=1 ){\n"+
" $gfxlib.filterConvolve3x3(64,64,64,64,[0.04,0.12,0.04, 0.12,0.36,0.12, 0.04,0.12,0.04]);\n"+
"}",
desc: "Some convolution kernels are symmetric (ie a Guassian "+
"kernel). They can be written as a row times it's transpose. "+
"When your convolution is of this form you can cheat a little "+
"and ignore the non-middle elements for a slight performance "+
"boost. The following compares a 'cheat' blur (top) to a "+
"'real' blur (bottom)."
};
DrawText = {
name: "Drawing Text",
code: "$gfxlib.setStyle('#F00','#0F0',1.0);\n"+
"$gfxlib.textSetFont('20px monospace');\n"+
"$gfxlib.textSetAlign('center','middle');\n"+
"$gfxlib.textDraw(64,64,'Hello World!');",
desc: "You need the set the font size (20px) and name "+
"(monospace) as shown above. textSetAlign controls "+
"how the text is positioned. textDraw writes 'Hello "+
"World!' at (64,64)."
};
MeasureText = {
name: "Measuring Text",
code: "$gfxlib.textSetFont('12px monospace');\n"+
"$gfxlib.textSetAlign('left','top');\n"+
"var w = $gfxlib.textGetWidth('Hello World!');\n"+
"$gfxlib.setStyle('yellow','red',1.0);\n"+
"$gfxlib.drawRect(32,32,w,12);\n"+
"$gfxlib.setStyle('black','none',1.0);\n"+
"$gfxlib.textDraw(32,32,'Hello World!');",
desc: "You can measure the width of your text after you style "+
"it and before you draw it."
};
PathSimple = {
name: "Simple Paths",
code: "$gfxlib.setStyle('yellow','red',1.0);\n"+
"$gfxlib.pathBegin(32,32);\n"+
"$gfxlib.pathMoveTo(64,32).pathLine();\n"+
"$gfxlib.pathMoveTo(64,64).pathLine();\n"+
"$gfxlib.pathMoveTo(32,64).pathLine();\n"+
"$gfxlib.pathClose();\n"+
"$gfxlib.pathDraw();",
desc: "You can use a path to connect several x,y "+
"coordinates with lines."
};
PathMove = {
name: "Path Move",
code: "$gfxlib.setStyle('yellow','red',1.0);\n"+
"$gfxlib.pathBegin(48,48);\n"+
"$gfxlib.pathMoveTo(80,48);\n"+
"$gfxlib.pathMoveTo(80,80);\n"+
"$gfxlib.pathMoveTo(48,48).pathLine();\n"+
"$gfxlib.pathMoveTo(48,64).pathDoMove();\n"+
"$gfxlib.pathMoveTo(64,80);\n"+
"$gfxlib.pathMoveTo(48,80);\n"+
"$gfxlib.pathMoveTo(48,64).pathLine();\n"+
"$gfxlib.pathDraw();",
desc: "You can use the move commands to go to a "+
"different point without a line."
};
PathRelative = {
name: "Relative Paths",
code: "$gfxlib.setStyle('#0F0','black',1.0);\n"+
"$gfxlib.pathBegin(32,32);\n"+
"$gfxlib.pathMoveBy(32,0).pathLine();\n"+
"$gfxlib.pathMoveBy(0,32).pathLine();\n"+
"$gfxlib.pathMoveBy(-32,0).pathLine();\n"+
"$gfxlib.pathClose();\n"+
"$gfxlib.pathDraw();",
desc: "You can specify coordinates in a relative manner. "+
"Instead of giving absolute coordinates, give the "+
"amount moved in each direction. In this example "+
"we start the square at 32,32. The point then draws "+
"a line 32 units to the right of it's last position to "+
"form the top. Then it goes 32 pixels down to form the "+
"right edge. Then it -32 pixels right (or 32 pixels "+
"left) to form the bottom before closing."
};
PathDirection = {
name: "Directional Paths",
code: "$gfxlib.setStyle('#0F0','black',1.0);\n"+
"$gfxlib.pathBegin(32,32);\n"+
"$gfxlib.pathTurnTo(0,32).pathLine();\n"+
"$gfxlib.pathTurnTo(-90,32).pathLine();\n"+
"$gfxlib.pathTurnTo(-180,32).pathLine();\n"+
"$gfxlib.pathClose();\n"+
"$gfxlib.pathDraw();",
desc: "Instead of specifying coordinates you can "+
"specify directions and lengths. The shape begins "+
"at 0,32. Then is goes 32 units in the direction of "+
"0 degrees. Then 32 units at -90 degrees. Finally, "+
"32 units at -180 degrees. 0 degrees is positve x ("+
"right), 90 degrees is positive y (down), 180 degrees "+
"is negative x (left), 270 is negative y (up). Going from "+
"0 to 360 is turning clockwise. If you are more "+
"comfortable turning counterclockwise (ie cartiesian "+
"coordinates), negate your angles."
};
PathDirectionRelative = {
name: "Relative Directional Paths",
code: "$gfxlib.setStyle('#0F0','black',1.0);\n"+
"$gfxlib.pathBegin(32,32);\n"+
"$gfxlib.pathTurnTo(0,32).pathLine();\n"+
"$gfxlib.pathTurnBy(90,32).pathLine();\n"+
"$gfxlib.pathTurnBy(90,32).pathLine();\n"+
"$gfxlib.pathClose();\n"+
"$gfxlib.pathDraw();",
desc: "You can also specify relative directions."+
"This is like turning. The line goes for 32 "+
"units in the direction of 0 degrees then it "+
"turns 90 degrees to its right and goes 32 "+
"units. Then it turns 90 degrees and goes "+
"another 32 units."
};
PathCurveTo = {
name: "Curves",
code: "$gfxlib.setStyle('yellow','red',1.0);\n"+
"$gfxlib.pathBegin(32,32);\n"+
"$gfxlib.pathMoveTo(64,32).pathLine();\n"+
"$gfxlib.pathMoveTo(32,64).pathCurve(-30);\n"+
"$gfxlib.pathClose();\n"+
"$gfxlib.pathDraw();",
desc: "You can draw a curve to a specific point. "+
"In this case the curve goes to (32,64). The "+
"curve is 'curved' -30 pixels to the right of "+
"the line (or 30 pixels to the left). The line "+
"is the line from the curve's starting point "+
"(64,32) to it's ending point (32,64)."
};
PathCurveTurn = {
name: "Curve Turns",
code: "$gfxlib.setStyle('#0F0','black',1.0);\n"+
"$gfxlib.pathBegin(32,32);\n"+
"$gfxlib.pathTurnTo(0,32).pathLine();\n"+
"$gfxlib.pathTurnBy(90,32).pathLine();\n"+
"$gfxlib.pathTurnBy(90,32).pathCurve(32);\n"+
"$gfxlib.pathClose();\n"+
"$gfxlib.pathDraw();",
desc: "You can also use relative directions with curves."
};
PathBezierTo = {
name: "Bezier Curves",
code: "$gfxlib.setStyle('#0F0','black',1.0);\n"+
"$gfxlib.pathBegin(32,32);\n"+
"$gfxlib.pathMoveTo(64,32);\n"+
"$gfxlib.pathMoveTo(64,64);\n"+
"$gfxlib.pathMoveTo(32,64).pathBezier();\n"+
"$gfxlib.pathClose();\n"+
"$gfxlib.pathDraw();",
desc: "You can draw bezier curves. The curve approaches "+
"control point one (64,32) then is pulled toward the "+
"second control point (64,64) until it finally "+
"reaches (32,64)."
};
PathHasPoint = {
name: "Point in Path",
code: "$gfxlib.setStyle('#0FF','black',1.0);\n"+
"$gfxlib.pathBegin(32,32);\n"+
"$gfxlib.pathMoveTo(64,32);\n"+
"$gfxlib.pathMoveTo(64,64);\n"+
"$gfxlib.pathMoveTo(32,64).pathBezier();\n"+
"var x = 64, y = 32;\n"+
"if( $gfxlib.pathHasPoint(x,y) ){\n"+
"\t$gfxlib.setStyle('red','black',1.0);\n"+
"}\n"+
"$gfxlib.pathClose();\n"+
"$gfxlib.pathDraw();\n"+
"$gfxlib.drawRectCenter(x,y,1,1);\n",
desc: "For simple collision detection you can see if a "+
"point is contained within a path. Go ahead and "+
"change the x and y to 48, 48. Then change it to "+
"52, 38."
};
ScratchSimple = {
name: "Scratch Area",
code: "$gfxlib.scratchNewCanvas(32,32);\n"+
"$gfxlib.setStyle('#0F0','black',1.0);\n"+
"$gfxlib.drawStar(16,16,8,16,5,0);\n"+
"var scratch = $gfxlib.scratchEndCanvas();\n"+
"$gfxlib.drawScratch(scratch,0,0);\n"+
"$gfxlib.drawScratch(scratch,64,64);\n"+
"$gfxlib.drawScratch(scratch,96,96);\n",
desc: "You can use a scratch canvas to cache drawings "+
"and improve speed."
};
ScratchScaling = {
name: "Scratch Scaling",
code: "$gfxlib.scratchNewCanvas(32,32);\n"+
"$gfxlib.setStyle('#FF0','black',1.0);\n"+
"$gfxlib.drawStar(16,16,8,16,5,0);\n"+
"var scratch = $gfxlib.scratchEndCanvas();\n"+
"$gfxlib.drawScratchScaled(scratch,0,0,2,2);\n"+
"$gfxlib.drawScratchScaled(scratch,64,64,1,1);\n"+
"$gfxlib.drawScratchScaled(scratch,96,96,0.5,0.5);\n",
desc: "You can draw the scratch canvas scaled to various sizes."
};
ScratchRegion = {
name: "Scratch Parts",
code: "$gfxlib.scratchNewCanvas(64,64);\n"+
"$gfxlib.setStyle('#F00','black',1.0);\n"+
"$gfxlib.drawStar(16,16,8,16,3,0);\n"+
"$gfxlib.drawStar(48,16,8,16,4,0);\n"+
"$gfxlib.drawStar(16,48,8,16,5,0);\n"+
"$gfxlib.drawStar(48,48,8,16,6,0);\n"+
"var scratch = $gfxlib.scratchEndCanvas();\n"+
"$gfxlib.drawScratchPart(scratch,0,0,32,32,0,48);\n"+
"$gfxlib.drawScratchPart(scratch,32,0,64,32,32,48);\n"+
"$gfxlib.drawScratchPart(scratch,0,32,32,64,64,48);\n"+
"$gfxlib.drawScratchPart(scratch,32,32,64,64,96,48);\n",
desc: "You can specify what region of the scratch area you "+
"would like to draw."
};
ScratchRegionScaling = {
name: "Scratch Scaled Region",
code: "$gfxlib.scratchNewCanvas(64,64);\n"+
"$gfxlib.setStyle('#F0F','black',1.0);\n"+
"$gfxlib.drawStar(16,16,8,16,3,0);\n"+
"$gfxlib.drawStar(48,16,8,16,4,0);\n"+
"$gfxlib.drawStar(16,48,8,16,5,0);\n"+
"$gfxlib.drawStar(48,48,8,16,6,0);\n"+
"var scratch = $gfxlib.scratchEndCanvas();\n"+
"$gfxlib.drawScratchPartScaled(scratch,0,0,32,32,0,32,2,2);\n"+
"$gfxlib.drawScratchPartScaled(scratch,32,0,64,32,64,48,1,1);\n"+
"$gfxlib.drawScratchPartScaled(scratch,0,32,32,64,96,56,0.5,0.5);\n",
desc: "You can even scale each region as it is drawn."
};
ScratchPattern = {
name: "Scratch Patterns",
code: "$gfxlib.scratchNewCanvas(32,32);\n"+
"$gfxlib.setStyle('#0F0','black',1.0);\n"+
"$gfxlib.drawStar(16,16,8,16,5,0);\n"+
"var pattern = $gfxlib.scratchToPattern('repeat');\n"+
"$gfxlib.setStyle(pattern,'black',1.0);\n"+
"$gfxlib.drawCircle(64,64,48);\n",
desc: "You can use a scratch canvas to create patterns that "+
"can be used as a fill style in other commands."
};
ScratchFromRegion = {
name: "Scratch From Region",
code: "$gfxlib.setStyle('none','#F00',1.0);\n"+
"$gfxlib.drawRect(16,16,32,32);\n"+
"$gfxlib.setStyle('#0F0','black',1.0);\n"+
"$gfxlib.drawStar(16,16,8,16,5,0);\n"+
"$gfxlib.drawStar(48,48,8,16,5,0);\n"+
"$gfxlib.scratchFromRegion(16,16,32,32);\n"+
"$gfxlib.drawStar(16,16,4,8,5,0);\n"+
"var scratch = $gfxlib.scratchEndCanvas();\n"+
"$gfxlib.drawScratch(scratch,80,16);\n"+
"$gfxlib.drawScratch(scratch,80,80);\n",
desc: "You can capture parts of things you have already drawn "+
"and repeat them or add to them."
};
ViewSimple = {
name: "Basic Viewport",
code: "//$gfxlib.viewSetCorners(0,0,64,64);\n"+
"$gfxlib.setStyle('none','red',1.0);\n"+
"$gfxlib.drawRect(0,0,64,64);\n"+
"$gfxlib.setStyle('blue','none',1.0);\n"+
"$gfxlib.drawRect(16,16,32,32);",
desc: "You can zoom or pan to different parts "+
"of the canvas using views. This canvas has the "+
"default view. Try uncommenting that line below."
};
ViewWrong = {
name: "Viewport Error",
code: "$gfxlib.setStyle('none','red',1.0);\n"+
"$gfxlib.drawRect(0,0,64,64);\n"+
"$gfxlib.setStyle('blue','none',1.0);\n"+
"$gfxlib.drawRect(16,16,32,32);\n"+
"$gfxlib.viewSetCorners(0,0,64,64);",
desc: "Don't set the after you draw stuff. Set the "+
"view first then draw everything."
};
ViewRotate = {
name: "Viewport Rotation",
code: "$gfxlib.viewSetCorners(0,0,64,64);\n"+
"$gfxlib.viewRotateTo(15);\n"+
"$gfxlib.setStyle('none','red',1.0);\n"+
"$gfxlib.drawRect(0,0,64,64);\n"+
"$gfxlib.setStyle('blue','none',1.0);\n"+
"$gfxlib.drawRect(16,16,32,32);",
desc: "You can also set the rotation of the viewport "+
"to a specific angle (in degrees). Positive angles "+
"make clockwise rotations."
};
ViewZoom = {
name: "Viewport Zooming",
code: "$gfxlib.viewSetCorners(0,0,64,64);\n"+
"$gfxlib.viewRotateTo(0);\n"+
"$gfxlib.viewZoomTo(1.5,1.5);\n"+
"$gfxlib.setStyle('none','red',1.0);\n"+
"$gfxlib.drawRect(0,0,64,64);\n"+
"$gfxlib.setStyle('blue','none',1.0);\n"+
"$gfxlib.drawRect(16,16,32,32);",
desc: "You can also set the rotation of the viewport "+
"to a specific angle (in degrees). Positive angles "+
"make clockwise rotations."
};
//http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#dom-context-2d-textalign
var examples = [
DrawRect,
SetStyle,
SetLine,
DrawRectCenter,
BasicCircle,
GradientLinear,
GradientRadial1,
GradientRadial2,
Checkerboard,
ClearAll,
DrawStar,
DrawPoly,
InvertAll,
InvertRegion,
Filters,
FilterColorSwap,
FilterHueShift,
Convolution,
FastConvolution,
DrawText,
MeasureText,
PathSimple,
PathMove,
PathRelative,
PathDirection,
PathDirectionRelative,
PathCurveTo,
PathCurveTurn,
PathBezierTo,
PathHasPoint,
ScratchSimple,
ScratchScaling,
ScratchRegion,
ScratchRegionScaling,
ScratchPattern,
ScratchFromRegion,
ViewSimple,
ViewWrong,
ViewRotate,
ViewZoom
];
function DrawModule(example,canvas){
$gfxlib.setCanvasNode(canvas);
eval(example.code);
};
function DrawPre(id){
var domCode = document.getElementById(id+'-edit');
var domPre = document.getElementById(id);
var code = domCode.value;
domPre.innerHTML = "";
domPre.appendChild(document.createTextNode(code));
domPre.style.display = 'block';
domCode.style.display = 'none';
$gfxlib.setCanvasNode(document.getElementById(id+'-canvas'));
$gfxlib.drawClearAll();
eval(code);
}
function HidePre(id){
document.getElementById(id).style.display = 'none';
document.getElementById(id+'-edit').style.display = 'block';
document.getElementById(id+'-edit').focus();
}
function gDrawPre(id){ return function(){DrawPre(id);}; }
function gHidePre(id){ return function(){HidePre(id);}; }
function CreateExampleDom(example){
// Create the div
var myContainer = document.createElement('div');
myContainer.className = 'preview-module';
var textContainer = document.createElement('div');
textContainer.className = 'text';
// Add the title
var myTitle = document.createElement('a');
myTitle.appendChild(document.createTextNode(example.name));
textContainer.appendChild(myTitle);
// Add the description
var myDesc = document.createElement('div');
myDesc.appendChild(document.createTextNode(example.desc));
myDesc.className = "desc";
textContainer.appendChild(myDesc);
// Add the code
var myCode = document.createElement('pre');
myCode.appendChild(document.createTextNode(example.code));
myCode.id = example.name;
textContainer.appendChild(myCode);
myCode.onclick = gHidePre(example.name);
var editArea = document.createElement('textarea');
editArea.style.display = 'none';
editArea.id = example.name + '-edit';
editArea.value = example.code;
editArea.onblur = gDrawPre(example.name);
textContainer.appendChild(editArea);
myContainer.appendChild(textContainer);
// Draw it
var myCanvas = document.createElement('canvas');
myCanvas.id = example.name+'-canvas';
myCanvas.width = 128;
myCanvas.height = 128;
DrawModule(example,myCanvas);
myContainer.appendChild(myCanvas);
document.body.appendChild(myContainer);
}
// ---------------------------------------------------------------- [ Main ] --
onload = function(){
//DrawRect.start();
//ViewSetByCorners1.start();
//NewCanvas.start();
//SetStyle.start();
//SetLine.start();
//DrawRectCenter.start();
//DrawCircle.start();
//GradientLinear.start();
//GradientRadial1.start();
//GradientRadial2.start();
//DrawCheckerboard.start();
//DrawClearAll.start();
//DrawModule(DrawRectData,document.getElementById("canvas-main"));
var nExamples = examples.length;
for(var i=0; i<nExamples; i+=1){
CreateExampleDom(examples[i]);
}
var start = {x: 3, y:4};
var end = {x:6, y:8};
function diff(a,b){
var ret = {};
for( key in a ){
if( key in b ){
ret[key] = a[key] - b[key];
}
}
return ret;
}
console.info(diff(end,start));
}
</script>
</body>
</html>