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index.js
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index.js
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import { canvas } from "./canvas";
// Load image drag and drop
document.getElementById("dragAndDropZone").addEventListener("dragover", (e) => {
e.preventDefault();
});
document.getElementById("dragAndDropZone").addEventListener("drop", (e) => {
e.preventDefault();
function loadImage(src) {
const image = new Image();
image.src = src;
image.onload = () => {
document.querySelector(".drag-helper").classList.add("invisible");
document.getElementById("controls").classList.remove("no-events");
canvas.drawImage(image);
};
}
const file = e.dataTransfer.files[0];
if (file) {
const reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = (e) => {
loadImage(e.target.result);
};
}
const url = e.dataTransfer.getData("url");
if (url) loadImage(url);
});
// Drawings
document.getElementById("ellipseDraw").addEventListener("click", () => {
canvas.performWhileMouseDown(() => {
const image = new Image();
let x0, y0, position;
const onmousedown = ({ pageX, pageY }) => {
position = canvas.getPosition();
x0 = pageX - position.left;
y0 = pageY - position.top;
image.src = canvas.getOctetStream();
};
const onmousemove = ({ pageX, pageY }) => {
canvas.drawWithoutCommit((context) => {
const { width, height } = canvas.getSize();
context.drawImage(image, 0, 0, width, height);
const x = pageX - position.left;
const y = pageY - position.top;
context.beginPath();
context.moveTo(x0, y0 + (y - y0) / 2);
context.bezierCurveTo(x0, y0, x, y0, x, y0 + (y - y0) / 2);
context.bezierCurveTo(x, y, x0, y, x0, y0 + (y - y0) / 2);
context.closePath();
context.stroke();
});
};
return { onmousedown, onmousemove };
});
});
document.getElementById("rectangleDraw").addEventListener("click", () => {
canvas.performWhileMouseDown(() => {
const image = new Image();
let startX, startY, position;
const onmousedown = ({ pageX, pageY }) => {
position = canvas.getPosition();
// save the starting x/y of the rectangle
startX = pageX - position.left;
startY = pageY - position.top;
image.src = canvas.getOctetStream();
};
const onmousemove = ({ pageX, pageY }) => {
const mouseX = pageX - position.left;
const mouseY = pageY - position.top;
const width = mouseX - startX;
const height = mouseY - startY;
canvas.drawWithoutCommit((context) => {
// Draw the initial image on the canvas
// to get rid of the previous rectangle
const canvasSize = canvas.getSize();
context.drawImage(image, 0, 0, canvasSize.width, canvasSize.height);
if (!width || !height) return;
context.strokeRect(startX, startY, width, height);
});
};
return { onmousedown, onmousemove };
});
});
document.getElementById("penDraw").addEventListener("click", () => {
canvas.performWhileMouseDown(() => {
const onmousedown = ({ offsetX, offsetY }) => {
canvas.drawWithoutCommit((context) => {
context.beginPath();
context.moveTo(offsetX, offsetY);
});
};
const onmousemove = (event) => {
canvas.drawWithoutCommit((context) => {
context.lineTo(event.offsetX, event.offsetY);
context.stroke();
});
};
return { onmousedown, onmousemove };
});
});
document.getElementById("lineDraw").addEventListener("click", () => {
canvas.performWhileMouseDown(() => {
const image = new Image();
let x, y, position;
const onmousedown = ({ pageX, pageY }) => {
position = canvas.getPosition();
x = pageX - position.left;
y = pageY - position.top;
image.src = canvas.getOctetStream();
};
const onmousemove = ({ pageX, pageY }) => {
canvas.drawWithoutCommit((context) => {
const canvasSize = canvas.getSize();
context.drawImage(image, 0, 0, canvasSize.width, canvasSize.height);
context.beginPath();
context.moveTo(x, y);
context.lineTo(pageX - position.left, pageY - position.top);
context.stroke();
context.closePath();
});
};
return { onmousedown, onmousemove };
});
});
// Crop
document.getElementById("cropButton").addEventListener("click", () => {
canvas.performWhileMouseDown(() => {
const image = new Image();
let startX, startY, position, width, height;
const onmousedown = ({ pageX, pageY }) => {
position = canvas.getPosition();
// save the starting x/y of the rectangle
startX = pageX - position.left;
startY = pageY - position.top;
image.src = canvas.getOctetStream();
};
const onmousemove = ({ pageX, pageY }) => {
const mouseX = pageX - position.left;
const mouseY = pageY - position.top;
width = mouseX - startX;
height = mouseY - startY;
canvas.drawWithoutCommit((context) => {
// Draw the initial image on the canvas
// to get rid of the previous rectangle
const canvasSize = canvas.getSize();
context.drawImage(image, 0, 0, canvasSize.width, canvasSize.height);
if (!width || !height) return;
context.strokeRect(startX, startY, width, height);
});
};
const onmouseup = () => {
canvas.drawWithoutCommit((context) => {
const absoluteWidth = Math.abs(width);
const absoluteHeight = Math.abs(height);
canvas.resize({ width: absoluteWidth, height: absoluteHeight });
context.drawImage(
image,
startX,
startY,
width,
height,
0,
0,
absoluteWidth,
absoluteHeight
);
});
};
return { onmousedown, onmousemove, onmouseup };
});
});
// Resize modal
const modal = new bootstrap.Modal(document.getElementById("resolutionModal"));
document
.getElementById("resolutionModal")
.addEventListener("show.bs.modal", () => {
const image = new Image();
const widthInput = document.getElementById("width-size");
const heightInput = document.getElementById("height-size");
const ratioCheckbox = document.getElementById("checkbox-img-ratio");
// Update values with current resolution
const canvasSize = canvas.getSize();
widthInput.value = canvasSize.width;
heightInput.value = canvasSize.height;
// Keep image ratio if selected
const ratio = canvasSize.width / canvasSize.height;
widthInput.addEventListener("keyup", () => {
if (!ratioCheckbox.checked) return;
heightInput.value = widthInput.value / ratio;
});
heightInput.addEventListener("keyup", () => {
if (!ratioCheckbox.checked) return;
widthInput.value = heightInput.value * ratio;
});
// Redraw image with new resolution values
document.getElementById("saveResolution").addEventListener("click", () => {
image.src = canvas.getOctetStream();
image.width = widthInput.value;
image.height = heightInput.value;
image.onload = () => canvas.drawImage(image);
modal.hide();
});
});
// Image filters
document.getElementById("grayscale").addEventListener("click", () => {
canvas.applyPixelTransformation((pixels) => {
for (let i = 0; i < pixels.length; i += 4)
pixels[i] =
pixels[i + 1] =
pixels[i + 2] =
Math.round((pixels[i] + pixels[i + 1] + pixels[i + 2]) / 3);
});
});
document.getElementById("threshold").addEventListener("click", () => {
canvas.applyPixelTransformation((pixels) => {
for (let i = 0; i < pixels.length; i += 4) {
const [r, g, b] = getRGB(pixels, i);
const v = 0.2126 * r + 0.7152 * g + 0.0722 * b >= 180 ? 255 : 0;
pixels[i] = pixels[i + 1] = pixels[i + 2] = v;
}
});
});
document.getElementById("sephia").addEventListener("click", () => {
canvas.applyPixelTransformation((pixels) => {
for (let i = 0; i < pixels.length; i += 4) {
const [r, g, b] = getRGB(pixels, i);
pixels[i] = r * 0.393 + g * 0.769 + b * 0.189;
pixels[i + 1] = r * 0.349 + g * 0.686 + b * 0.168;
pixels[i + 2] = r * 0.272 + g * 0.534 + b * 0.131;
}
});
});
document.getElementById("invert").addEventListener("click", () => {
canvas.applyPixelTransformation((pixels) => {
for (let i = 0; i < pixels.length; i += 4) {
const [r, g, b] = getRGB(pixels, i);
pixels[i] = 255 - r;
pixels[i + 1] = 255 - g;
pixels[i + 2] = 255 - b;
}
});
});
function getRGB(pixel, position) {
return [pixel[position], pixel[position + 1], pixel[position + 2]];
}
// History buttons
document
.getElementById("redoButton")
.addEventListener("click", () => canvas.redo());
document
.getElementById("undoButton")
.addEventListener("click", () => canvas.undo());
// Download
document.getElementById("linkDownload").addEventListener("click", (e) => {
if (canvas.isEmpty()) e.preventDefault();
e.currentTarget.setAttribute("href", canvas.getOctetStream());
});