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playground.js
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playground.js
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const modes = [
"image1",
"image2",
"add",
"subtract",
"inverse-subtract",
"multiply",
"divide",
"inverse-divide",
"lighten",
"darken",
"screen",
"overlay",
"random",
"0",
"128",
"255",
];
let rFunc = null;
let gFunc = null;
let bFunc = null;
const canvasOne = document.querySelector("#canvas-one");
const canvasTwo = document.querySelector("#canvas-two");
const canvasThree = document.querySelector("#canvas-three");
const contextOne = canvasOne.getContext("2d");
const contextTwo = canvasTwo.getContext("2d");
const contextThree = canvasThree.getContext("2d");
const startEl = document.querySelector("#run");
const setAll = document.querySelector("#setAll");
const rSelect = document.querySelector("#rSelect");
const gSelect = document.querySelector("#gSelect");
const bSelect = document.querySelector("#bSelect");
const randomInRange = function (max) {
return Math.floor(Math.random() * max);
};
const applyMode = function (mode, data, data2) {
const perc = data / 255;
const perc2 = data2 / 255;
switch (mode) {
case "image1":
return data;
case "image2":
return data2;
case "add":
return (perc + perc2) * 255;
case "subtract":
return (perc - perc2) * 255;
case "inverse-subtract":
return (perc2 - perc) * 255;
case "multiply":
return perc * perc2 * 255;
case "divide":
return (perc / perc2) * 255;
case "inverse-divide":
return (perc2 / perc) * 255;
case "lighten":
return data > data2 ? data : data2;
case "darken":
return data < data2 ? data : data2;
case "screen":
return (1 - (1 - perc) * (1 - perc2)) * 255;
case "overlay":
return perc < 0.5
? perc * perc2 * 255
: (1 - 2 * (1 - perc2) * (1 - perc)) * 255;
case "random":
return randomInRange(255);
case "0":
return 0;
case "128":
return 128;
case "255":
return 255;
}
};
const drawNewImage = function (imageData) {
contextThree.putImageData(imageData, 0, 0);
};
const processImage = function () {
const imageData = contextOne.getImageData(0, 0, 500, 500);
const imageData2 = contextTwo.getImageData(0, 0, 500, 500);
const data = imageData.data;
const data2 = imageData2.data;
for (let i = 0; i < data.length; i += 4) {
data[i] = applyMode(rFunc, data[i], data2[i]);
data[i + 1] = applyMode(gFunc, data[i + 1], data2[i + 1]);
data[i + 2] = applyMode(bFunc, data[i + 2], data2[i + 2]);
}
drawNewImage(imageData);
};
const loadImage = function () {
const img = new Image();
img.onload = function () {
contextOne.drawImage(img, 0, 0, 500, 500);
};
img.src = "img/test.png";
const img2 = new Image();
img2.onload = function () {
contextTwo.drawImage(img2, 0, 0, 500, 500);
};
img2.src = "img/test2.png";
setTimeout(() => {
processImage();
}, 100);
};
const startDemo = function (event) {
rFunc = rSelect.value;
gFunc = gSelect.value;
bFunc = bSelect.value;
loadImage();
};
startEl.addEventListener("click", startDemo);
setAll.addEventListener("change", function (event) {
const optionValue = setAll.value;
rSelect.value = optionValue;
gSelect.value = optionValue;
bSelect.value = optionValue;
});
const populateOptions = () => {
modes.forEach((mode) => {
const rOption = document.createElement("OPTION");
rOption.value = mode;
rOption.textContent = mode;
rSelect.appendChild(rOption);
const gOption = document.createElement("OPTION");
gOption.value = mode;
gOption.textContent = mode;
gSelect.appendChild(gOption);
const bOption = document.createElement("OPTION");
bOption.value = mode;
bOption.textContent = mode;
bSelect.appendChild(bOption);
const allOption = document.createElement("OPTION");
allOption.value = mode;
allOption.textContent = mode;
setAll.appendChild(allOption);
});
};
populateOptions();