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Added support for devicePixelRatio for high-ppi displays #33

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Added support for devicePixelRatio for high-ppi displays #33

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41 changes: 37 additions & 4 deletions js/heartcode-canvasloader.js
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Original file line number Diff line number Diff line change
Expand Up @@ -137,6 +137,13 @@
} catch (error) {
this.mum = document.body;
}

var dpr = window.devicePixelRatio;
if (dpr == null || isNaN(new Number(dpr)) || dpr < 1) {
dpr = 1;
}
this.dpr = dpr;

// Creates the parent div of the loader instance
opt.id = typeof (opt.id) !== "undefined" ? opt.id : "canvasLoader";
this.cont = addEl("div", this.mum, {id: opt.id});
Expand All @@ -145,10 +152,11 @@
engine = engines[0];
// Create the canvas element
this.can = addEl("canvas", this.cont);
this.con = this.can.getContext("2d");
// Create the cache canvas element
this.cCan = setCSS(addEl("canvas", this.cont), { display: "none" });
this.cCon = this.cCan.getContext("2d");

this.setCanvasSize();

} else {
// For browsers without Canvas support...
engine = engines[1];
Expand Down Expand Up @@ -427,8 +435,7 @@
var i = 0, size, w, h, x, y, ang, rads, rad, de = this.density, animBits = Math.round(de * this.range), bitMod, minBitMod = 0, s, g, sh, f, d = 1000, arc = 0, c = this.cCon, di = this.diameter, e = 0.47;
if (engine === engines[0]) {
c.clearRect(0, 0, d, d);
setAttr(this.can, {width: di, height: di});
setAttr(this.cCan, {width: di, height: di});

while (i < de) {
bitMod = i <= animBits ? 1 - ((1 - minBitMod) / animBits * i) : bitMod = minBitMod;
ang = 270 - 360 / de * i;
Expand Down Expand Up @@ -557,13 +564,39 @@
}
}
};

p.setCanvasSize = function() {

if (canSup) {
var di = this.diameter,
sd = di * this.dpr;

setCSS(this.can, {width: di + 'px', height: di + 'px'});
setAttr(this.can, {width: sd, height: sd});
setCSS(this.cCan, {width: di + 'px', height: di + 'px'});
setAttr(this.cCan, {width: sd, height: sd});

// recreate contexts
this.con = this.can.getContext("2d");
this.cCon = this.cCan.getContext("2d");

if (this.dpr != 1) {
this.con.scale(this.dpr, this.dpr);
this.cCon.scale(this.dpr, this.dpr);
}

}

};

/**
* Redraws the canvas
* @method redraw
* @protected
*/
p.redraw = function () {
this.clean();
this.setCanvasSize();
this.draw();
};
/**
Expand Down