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Add contrast and make he lives in you better

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This commit is contained in:
Daniel Odendahl Jr
2017-11-05 19:20:14 +00:00
parent 0c802745de
commit 4ea2351147
8 changed files with 76 additions and 9 deletions
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util/Canvas.js
+17 -4
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@@ -45,16 +45,29 @@ class CanvasUtil {
return ctx;
}
static distort(ctx, x, y, width, height, amplitude, strideLevel = 4) {
static contrast(ctx, x, y, width, height) {
const data = ctx.getImageData(x, y, width, height);
const factor = (259 / 100) + 1;
const intercept = 128 * (1 - factor);
for (let i = 0; i < data.data.length; i += 4) {
data.data[i] = (data.data[i] * factor) + intercept;
data.data[i + 1] = (data.data[i + 1] * factor) + intercept;
data.data[i + 2] = (data.data[i + 2] * factor) + intercept;
}
ctx.putImageData(data, x, y);
return ctx;
}
static distort(ctx, amplitude, x, y, width, height) {
const data = ctx.getImageData(x, y, width, height);
const temp = ctx.getImageData(x, y, width, height);
const stride = width * strideLevel;
const stride = width * 4;
for (let i = 0; i < width; i++) {
for (let j = 0; j < height; j++) {
const xs = Math.round(amplitude * Math.sin(2 * Math.PI * 3 * (j / height)));
const ys = Math.round(amplitude * Math.cos(2 * Math.PI * 3 * (i / width)));
const dest = (j * stride) + (i * strideLevel);
const src = ((j + ys) * stride) + ((i + xs) * strideLevel);
const dest = (j * stride) + (i * 4);
const src = ((j + ys) * stride) + ((i + xs) * 4);
data.data[dest] = temp.data[src];
data.data[dest + 1] = temp.data[src + 1];
data.data[dest + 2] = temp.data[src + 2];