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canvasquery.js
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canvasquery.js
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/*
Canvas Query r9
http://canvasquery.com
(c) 2012-2016 http://rezoner.net
Canvas Query may be freely distributed under the MIT license.
r9
+ even more precise fontHeight and fontTop
+ textBoundaries and wrappedText use same alg for maxWidth when newline is detected
r8
+ improved matchPalette performance
+ defaultFont
r7
+ more accurate fontHeight()
+ fillText respects no antialiasing when using pixel font
+ textBaseline("top") consistent among browsers
+ align state is added to the stack
+ new canvases are pulled from the pool
+ filter (experimetnal)
r6
+ ImageBitmap support
+ drawImageCentered
+ drawRegionCentered
+ default textBaseline
+ resizeBounds
r5
! fixed: leaking arguments in fastApply bailing out optimization
+ cacheText
+ compare
+ checkerboard
*/
(function() {
var COCOONJS = false;
var Canvas = window.HTMLCanvasElement;
var orgImage = window.Image;
var Image = window.HTMLImageElement;
var ImageBitmap = window.ImageBitmap || window.HTMLImageElement;
var COCOONJS = navigator.isCocoonJS;
var cq = function(selector) {
if (arguments.length === 0) {
var canvas = cq.pool();
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
} else if (typeof selector === "string") {
var canvas = document.querySelector(selector);
} else if (typeof selector === "number") {
var canvas = cq.pool();
canvas.width = arguments[0];
canvas.height = arguments[1];
} else if (selector instanceof Image) {
var canvas = cq.pool();
canvas.width = selector.width;
canvas.height = selector.height;
canvas.getContext("2d").drawImage(selector, 0, 0);
} else if (selector instanceof ImageBitmap) {
var canvas = cq.pool();
canvas.width = selector.width;
canvas.height = selector.height;
canvas.getContext("2d").drawImage(selector, 0, 0);
} else if (selector instanceof cq.Layer) {
return selector;
} else {
var canvas = selector;
}
return new cq.Layer(canvas);
};
cq.lineSpacing = 1.0;
cq.defaultFont = "";
cq.textBaseline = "alphabetic";
cq.matchPalettePrecision = 10;
cq.palettes = {
db16: ["#140c1c", "#442434", "#30346d", "#4e4a4e", "#854c30", "#346524", "#d04648", "#757161", "#597dce", "#d27d2c", "#8595a1", "#6daa2c", "#d2aa99", "#6dc2ca", "#dad45e", "#deeed6"],
db32: ["#000000", "#222034", "#45283c", "#663931", "#8f563b", "#df7126", "#d9a066", "#eec39a", "#fbf236", "#99e550", "#6abe30", "#37946e", "#4b692f", "#524b24", "#323c39", "#3f3f74", "#306082", "#5b6ee1", "#639bff", "#5fcde4", "#cbdbfc", "#ffffff", "#9badb7", "#847e87", "#696a6a", "#595652", "#76428a", "#ac3232", "#d95763", "#d77bba", "#8f974a", "#8a6f30"],
c64: ["#000000", "#6a5400", "#68ae5c", "#8a8a8a", "#adadad", "#636363", "#c37b75", "#c9d684", "#ffffff", "#984b43", "#a3e599", "#79c1c8", "#9b6739", "#9b51a5", "#52429d", "#8a7bce"],
gameboy: ["#0f380f", "#306230", "#8bac0f", "#9bbc0f"],
sega: ["#000000", "#555500", "#005500", "#555555", "#55aa00", "#550000", "#aaffaa", "#aaaaaa", "#ff5555", "#005555", "#550055", "#aaaa55", "#ffffaa", "#aa5555", "#ffaa55", "#ffff55", "#ffffff", "#ffaaaa", "#000055", "#55aaaa", "#aa0000", "#ff5500", "#ffaa00", "#aa5500", "#ff0000", "#ffaaff", "#aa55aa", "#aaaa00", "#aaff00", "#aaaaff", "#5555aa", "#aaffff"],
cga: ["#000000", "#ff5555", "#55ff55", "#ffff55"],
nes: ["#7C7C7C", "#0000FC", "#0000BC", "#4428BC", "#940084", "#A80020", "#A81000", "#881400", "#503000", "#007800", "#006800", "#005800", "#004058", "#000000", "#000000", "#000000", "#BCBCBC", "#0078F8", "#0058F8", "#6844FC", "#D800CC", "#E40058", "#F83800", "#E45C10", "#AC7C00", "#00B800", "#00A800", "#00A844", "#008888", "#000000", "#000000", "#000000", "#F8F8F8", "#3CBCFC", "#6888FC", "#9878F8", "#F878F8", "#F85898", "#F87858", "#FCA044", "#F8B800", "#B8F818", "#58D854", "#58F898", "#00E8D8", "#787878", "#000000", "#000000", "#FCFCFC", "#A4E4FC", "#B8B8F8", "#D8B8F8", "#F8B8F8", "#F8A4C0", "#F0D0B0", "#FCE0A8", "#F8D878", "#D8F878", "#B8F8B8", "#B8F8D8", "#00FCFC", "#F8D8F8", "#000000"],
};
/*
cq.loadImages();
cq.run(function(){
});
*/
cq.cocoon = function(selector) {
if (arguments.length === 0) {
var canvas = cq.createCocoonCanvas(window.innerWidth, window.innerHeight);
window.addEventListener("resize", function() {});
} else if (typeof selector === "string") {
var canvas = document.querySelector(selector);
} else if (typeof selector === "number") {
var canvas = cq.createCocoonCanvas(arguments[0], arguments[1]);
} else if (selector instanceof Image) {
var canvas = cq.createCocoonCanvas(selector);
} else if (selector instanceof cq.Layer) {
return selector;
} else {
var canvas = selector;
}
return new cq.Layer(canvas);
}
cq.extend = function() {
for (var i = 1; i < arguments.length; i++) {
for (var j in arguments[i]) {
arguments[0][j] = arguments[i][j];
}
}
return arguments[0];
};
cq.augment = function() {
for (var i = 1; i < arguments.length; i++) {
_.extend(arguments[0], arguments[i]);
arguments[i](arguments[0]);
}
};
cq.distance = function(x1, y1, x2, y2) {
if (arguments.length > 2) {
var dx = x1 - x2;
var dy = y1 - y2;
return Math.sqrt(dx * dx + dy * dy);
} else {
return Math.abs(x1 - y1);
}
};
/* fast.js */
cq.fastApply = function(subject, thisContext, args) {
switch (args.length) {
case 0:
return subject.call(thisContext);
case 1:
return subject.call(thisContext, args[0]);
case 2:
return subject.call(thisContext, args[0], args[1]);
case 3:
return subject.call(thisContext, args[0], args[1], args[2]);
case 4:
return subject.call(thisContext, args[0], args[1], args[2], args[3]);
case 5:
return subject.call(thisContext, args[0], args[1], args[2], args[3], args[4]);
case 6:
return subject.call(thisContext, args[0], args[1], args[2], args[3], args[4], args[5]);
case 7:
return subject.call(thisContext, args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
case 8:
return subject.call(thisContext, args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7]);
case 9:
return subject.call(thisContext, args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8]);
default:
return subject.apply(thisContext, args);
}
};
cq.extend(cq, {
smoothing: true,
blend: function(below, above, mode, mix) {
if (typeof mix === "undefined") mix = 1;
var below = cq(below);
var mask = below.clone();
var above = cq(above);
below.save();
below.globalAlpha(mix);
below.globalCompositeOperation(mode);
below.drawImage(above.canvas, 0, 0);
below.restore();
mask.save();
mask.globalCompositeOperation("source-in");
mask.drawImage(below.canvas, 0, 0);
mask.restore();
return mask;
},
matchColor: function(color, palette) {
var rgbPalette = [];
for (var i = 0; i < palette.length; i++) {
rgbPalette.push(cq.color(palette[i]));
}
var imgData = cq.color(color);
var difList = [];
for (var j = 0; j < rgbPalette.length; j++) {
var rgbVal = rgbPalette[j];
var rDif = Math.abs(imgData[0] - rgbVal[0]),
gDif = Math.abs(imgData[1] - rgbVal[1]),
bDif = Math.abs(imgData[2] - rgbVal[2]);
difList.push(rDif + gDif + bDif);
}
var closestMatch = 0;
for (var j = 0; j < palette.length; j++) {
if (difList[j] < difList[closestMatch]) {
closestMatch = j;
}
}
return palette[closestMatch];
},
temp: function(width, height) {
if (!this.tempLayer) {
this.tempLayer = cq(1, 1);
}
if (width instanceof Image || width instanceof ImageBitmap) {
this.tempLayer.width = width.width;
this.tempLayer.height = width.height;
this.tempLayer.context.drawImage(width, 0, 0);
} else if (width instanceof Canvas) {
this.tempLayer.width = width.width;
this.tempLayer.height = width.height;
this.tempLayer.context.drawImage(width, 0, 0);
} else if (width instanceof CanvasQuery.Layer) {
this.tempLayer.width = width.width;
this.tempLayer.height = width.height;
this.tempLayer.context.drawImage(width.canvas, 0, 0);
} else {
this.tempLayer.width = width;
this.tempLayer.height = height;
}
return this.tempLayer;
},
wrapValue: function(value, min, max) {
if (value < min) return max + (value % max);
if (value >= max) return value % max;
return value;
},
limitValue: function(value, min, max) {
return value < min ? min : value > max ? max : value;
},
mix: function(a, b, amount) {
return a + (b - a) * amount;
},
hexToRgb: function(hex) {
if (hex.length === 7) return ['0x' + hex[1] + hex[2] | 0, '0x' + hex[3] + hex[4] | 0, '0x' + hex[5] + hex[6] | 0];
else return ['0x' + hex[1] + hex[1] | 0, '0x' + hex[2] + hex[2] | 0, '0x' + hex[3] + hex[3] | 0];
},
rgbToHex: function(r, g, b) {
return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1, 7);
},
extractCanvas: function(o) {
if (o.canvas) return o.canvas;
else return o;
},
compare: function(a, b) {
a = this.extractCanvas(a);
b = this.extractCanvas(b);
a = a.getContext("2d").getImageData(0, 0, a.width, a.height).data;
b = b.getContext("2d").getImageData(0, 0, b.width, b.height).data;
if (a.length !== b.length) return false;
for (var i = 0; i < a.length; i++) {
if (a[i] !== b[i]) return false;
}
return true;
},
/* author: http://mjijackson.com/ */
rgbToHsl: function(r, g, b) {
if (r instanceof Array) {
b = r[2];
g = r[1];
r = r[0];
}
r /= 255, g /= 255, b /= 255;
var max = Math.max(r, g, b),
min = Math.min(r, g, b);
var h, s, l = (max + min) / 2;
if (max == min) {
h = s = 0; // achromatic
} else {
var d = max - min;
s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
switch (max) {
case r:
h = (g - b) / d + (g < b ? 6 : 0);
break;
case g:
h = (b - r) / d + 2;
break;
case b:
h = (r - g) / d + 4;
break;
}
h /= 6;
}
return [h, s, l];
},
/* author: http://mjijackson.com/ */
hue2rgb: function(p, q, t) {
if (t < 0) t += 1;
if (t > 1) t -= 1;
if (t < 1 / 6) return p + (q - p) * 6 * t;
if (t < 1 / 2) return q;
if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
return p;
},
hslToRgb: function(h, s, l) {
var r, g, b;
if (s == 0) {
r = g = b = l; // achromatic
} else {
var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
var p = 2 * l - q;
r = this.hue2rgb(p, q, h + 1 / 3);
g = this.hue2rgb(p, q, h);
b = this.hue2rgb(p, q, h - 1 / 3);
}
return [r * 255 | 0, g * 255 | 0, b * 255 | 0];
},
rgbToHsv: function(r, g, b) {
if (r instanceof Array) {
b = r[2];
g = r[1];
r = r[0];
}
r = r / 255, g = g / 255, b = b / 255;
var max = Math.max(r, g, b),
min = Math.min(r, g, b);
var h, s, v = max;
var d = max - min;
s = max == 0 ? 0 : d / max;
if (max == min) {
h = 0; // achromatic
} else {
switch (max) {
case r:
h = (g - b) / d + (g < b ? 6 : 0);
break;
case g:
h = (b - r) / d + 2;
break;
case b:
h = (r - g) / d + 4;
break;
}
h /= 6;
}
return [h, s, v];
},
hsvToRgb: function(h, s, v) {
var r, g, b;
var i = Math.floor(h * 6);
var f = h * 6 - i;
var p = v * (1 - s);
var q = v * (1 - f * s);
var t = v * (1 - (1 - f) * s);
switch (i % 6) {
case 0:
r = v, g = t, b = p;
break;
case 1:
r = q, g = v, b = p;
break;
case 2:
r = p, g = v, b = t;
break;
case 3:
r = p, g = q, b = v;
break;
case 4:
r = t, g = p, b = v;
break;
case 5:
r = v, g = p, b = q;
break;
}
return [r * 255, g * 255, b * 255];
},
color: function() {
var result = new cq.Color();
result.parse(arguments[0], arguments[1]);
return result;
},
poolArray: [],
pool: function() {
if (!this.poolArray.length) {
for (var i = 0; i < 100; i++) {
this.poolArray.push(this.createCanvas(1, 1));
}
}
return this.poolArray.pop();
},
reuse: function(object) {
return this.recycle(object);
},
recycle: function(object) {
if (object instanceof CanvasQuery.Layer) {
this.poolArray.push(object.canvas);
} else {
this.poolArray.push(object);
}
},
setContextSmoothing: function(context, smoothing) {
context.mozImageSmoothingEnabled = smoothing;
context.msImageSmoothingEnabled = smoothing;
context.webkitImageSmoothingEnabled = smoothing;
context.imageSmoothingEnabled = smoothing;
},
createCanvas: function(width, height) {
var result = document.createElement("canvas");
if (arguments[0] instanceof Image || arguments[0] instanceof Canvas || arguments[0] instanceof ImageBitmap) {
var image = arguments[0];
result.width = image.width;
result.height = image.height;
result.getContext("2d").drawImage(image, 0, 0);
} else {
result.width = width;
result.height = height;
}
return result;
},
createCocoonCanvas: function(width, height) {
var result = document.createElement("screencanvas");
if (arguments[0] instanceof Image) {
var image = arguments[0];
result.width = image.width;
result.height = image.height;
result.getContext("2d").drawImage(image, 0, 0);
} else {
result.width = width;
result.height = height;
}
return result;
},
createImageData: function(width, height) {
return cq.createCanvas(width, height).getContext("2d").createImageData(width, height);
}
});
cq.Layer = function(canvas) {
this.context = canvas.getContext("2d");
this.canvas = canvas;
this.prevAlignX = [];
this.prevAlignY = [];
this.alignX = 0;
this.alignY = 0;
this.aligned = false;
this.update();
};
cq.Layer.prototype = {
constructor: cq.Layer,
update: function() {
var smoothing = cq.smoothing;
if (typeof this.smoothing !== "undefined") smoothing = this.smoothing;
this.context.mozImageSmoothingEnabled = smoothing;
this.context.msImageSmoothingEnabled = smoothing;
this.context.webkitImageSmoothingEnabled = smoothing;
this.context.imageSmoothingEnabled = smoothing;
if (cq.defaultFont) this.context.font = cq.defaultFont;
this.context.textBaseline = cq.textBaseline;
if (COCOONJS) Cocoon.Utils.setAntialias(smoothing);
},
appendTo: function(selector) {
if (typeof selector === "object") {
var element = selector;
} else {
var element = document.querySelector(selector);
}
element.appendChild(this.canvas);
return this;
},
a: function(a) {
if (arguments.length) {
this.previousAlpha = this.globalAlpha();
return this.globalAlpha(a);
} else {
return this.globalAlpha();
}
},
ra: function() {
return this.a(this.previousAlpha);
},
/*
drawImage: function() {
if (!this.alignX && !this.alignY) {
this.context.call
}
return this;
},
restore: function() {
this.context.restore();
this.alignX = 0;
this.alignY = 0;
},
*/
realign: function() {
this.alignX = this.prevAlignX[this.prevAlignX.length - 1];
this.alignY = this.prevAlignY[this.prevAlignY.length - 1];
return this;
},
align: function(x, y) {
if (typeof y === "undefined") y = x;
this.alignX = x;
this.alignY = y;
return this;
},
/* save translate align rotate scale */
stars: function(x, y, alignX, alignY, rotation, scaleX, scaleY) {
if (typeof alignX === "undefined") alignX = 0.5;
if (typeof alignY === "undefined") alignY = 0.5;
if (typeof rotation === "undefined") rotation = 0;
if (typeof scaleX === "undefined") scaleX = 1.0;
if (typeof scaleY === "undefined") scaleY = scaleX;
this.save();
this.translate(x, y);
this.align(alignX, alignY);
this.rotate(rotation);
this.scale(scaleX, scaleY);
return this;
},
tars: function(x, y, alignX, alignY, rotation, scaleX, scaleY) {
if (typeof alignX === "undefined") alignX = 0.5;
if (typeof alignY === "undefined") alignY = 0.5;
if (typeof rotation === "undefined") rotation = 0;
if (typeof scaleX === "undefined") scaleX = 1.0;
if (typeof scaleY === "undefined") scaleY = scaleX;
this.translate(x, y);
this.align(alignX, alignY);
this.rotate(rotation);
this.scale(scaleX, scaleY);
return this;
},
webkit: ('WebkitAppearance' in document.documentElement.style),
fillText: function(text, x, y, gap) {
text = String(text);
if (!text.length) return;
var webkitHack = !cq.smoothing && (this.fontHeight() <= 64) && ('WebkitAppearance' in document.documentElement.style);
if (webkitHack) {
var scale = this.webkit ? 4 : 5;
var canvas = cq.pool();
var context = canvas.getContext("2d");
context.font = this.context.font;
var realWidth = context.measureText(text).width;
var width = Math.ceil(realWidth);
var gap = gap || (width - realWidth);
var height = this.fontHeight();
canvas.width = width * scale;
canvas.height = height * scale;
cq.setContextSmoothing(context, false);
// context.fillStyle = "#fff";
// context.fillRect(0,0,canvas.width, canvas.height);
context.font = this.context.font;
context.fillStyle = this.context.fillStyle;
context.textBaseline = "top";
context.scale(scale, scale);
context.fillText(text, gap, -this.fontTop());
if (this.context.textAlign === "center") x -= width * 0.5;
else if (this.context.textAlign === "right") x -= width;
this.drawImage(canvas, 0, 0, canvas.width, canvas.height, x, y, canvas.width / scale, canvas.height / scale);
} else {
this.context.fillText(text, x, y - this.fontTop());
}
return this;
},
fillRect: function() {
if (this.alignX || this.alignY) {
this.context.fillRect(arguments[0] - arguments[2] * this.alignX | 0, arguments[1] - arguments[3] * this.alignY | 0, arguments[2], arguments[3]);
} else {
this.context.fillRect(arguments[0], arguments[1], arguments[2], arguments[3]);
}
// cq.fastApply(this.context.fillRect, this.context, arguments);
return this;
},
strokeRect: function() {
if (this.alignX || this.alignY) {
this.context.strokeRect(arguments[0] - arguments[2] * this.alignX | 0, arguments[1] - arguments[3] * this.alignY | 0, arguments[2], arguments[3]);
} else {
this.context.strokeRect(arguments[0], arguments[1], arguments[2], arguments[3]);
}
// cq.fastApply(this.context.strokeRect, this.context, arguments);
return this;
},
drawImage: function(image, sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight) {
if (this.alignX || this.alignY) {
if (sWidth == null) {
sx -= image.width * this.alignX | 0;
sy -= image.height * this.alignY | 0;
} else {
dx -= dWidth * this.alignX | 0;
dy -= dHeight * this.alignY | 0;
}
}
if (sWidth == null) {
this.context.drawImage(image, sx, sy);
} else if (dx == null) {
this.context.drawImage(image, sx, sy, sWidth, sHeight);
} else {
this.context.drawImage(image, sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight);
}
// cq.fastApply(this.context.drawImage, this.context, arguments);
return this;
},
drawImageCentered: function(image, sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight) {
if (sWidth == null) {
sx -= image.width * 0.5 | 0;
sy -= image.height * 0.5 | 0;
} else {
dx -= dWidth * 0.5 | 0;
dy -= dHeight * 0.5 | 0;
}
if (sWidth == null) {
this.context.drawImage(image, sx, sy);
} else if (dx == null) {
this.context.drawImage(image, sx, sy, sWidth, sHeight);
} else {
this.context.drawImage(image, sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight);
}
return this;
},
save: function() {
this.prevAlignX.push(this.alignX);
this.prevAlignY.push(this.alignY);
this.context.save();
return this;
},
restore: function() {
this.realign();
this.alignX = this.prevAlignX.pop();
this.alignY = this.prevAlignY.pop();
this.context.restore();
return this;
},
drawTile: function(image, x, y, frameX, frameY, frameWidth, frameHeight, frames, frame) {
},
checkerboard: function(x, y, w, h, grid, colorA, colorB) {
var tx = w / grid | 0;
var ty = h / grid | 0;
this.save();
this.rect(x, y, w, h).clip();
for (var i = 0; i <= tx; i++) {
for (var j = 0; j <= ty; j++) {
if (j % 2) var color = i % 2 ? colorA : colorB;
else var color = i % 2 ? colorB : colorA;
this.fillStyle(color);
this.fillRect(x + i * grid, y + j * grid, grid, grid);
}
}
this.restore();
},
drawAtlasFrame: function(atlas, frame, x, y) {
var frame = atlas.frames[frame];
this.drawRegion(
atlas.image,
frame.region,
x - frame.width * this.alignX + frame.offset[0] + frame.region[2] * this.alignX,
y - frame.height * this.alignY + frame.offset[1] + frame.region[3] * this.alignY
);
return this;
},
imageFill: function(image, width, height) {
var scale = Math.max(width / image.width, height / image.height);
this.save();
this.scale(scale, scale);
this.drawImage(image, 0, 0);
this.restore();
},
drawRegion: function(image, region, x, y, scale) {
scale = scale || 1;
return this.drawImage(
image, region[0], region[1], region[2], region[3],
x | 0, y | 0, region[2] * scale | 0, region[3] * scale | 0
);
},
drawRegionCentered: function(image, region, x, y, scale) {
scale = scale || 1;
return this.drawImageCentered(
image, region[0], region[1], region[2], region[3],
x | 0, y | 0, region[2] * scale | 0, region[3] * scale | 0
);
},
cache: function() {
return this.clone().canvas;
},
popup: function() {
window.open(this.canvas.toDataURL());
return this;
},
blendOn: function(what, mode, mix) {
cq.blend(what, this, mode, mix);
return this;
},