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index.js
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index.js
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let tool = "pen";
let isPressed = false;
const canvas = document.getElementById('box');
const ctx = canvas.getContext('2d');
const elementPen = document.getElementById("pen");
const elementErase = document.getElementById('eraser');
const palette = document.querySelectorAll('.color');
const tools = document.querySelectorAll('.tools');
const radius = document.querySelectorAll('.size');
const firstColor = document.getElementById('black');
const firstRadiusSize = document.getElementById('standart');
//Select new cursor :
function ChangeCursor(cursor) {
document.body.style.cursor = `url('./img/${cursor}.png'), auto`;
}
//Get mouse pos :
function getMousePos(mouse) {
const rect = canvas.getBoundingClientRect();
return {
x: mouse.x - rect.left,
y: mouse.y - rect.top
};
}
//This function allow us to load all the stuff on begin :
function OnBegin() {
//Some default value :
let lastColor = null;
let lastTool = null;
let lastRadius = null;
bMouseDown = false;
firstColor.style.border = '1px solid white';
elementPen.style.border = '1px solid white';
firstRadiusSize.style.border = '1px solid white';
ctx.lineWidth = 1;
ctx.lineCap = "round";
ChangeCursor("pen_cursor");
//Loop for each color item :
palette.forEach(element => {
element.addEventListener('click', function() {
if (lastColor) lastColor.style.border = '1px solid black';
ctx.strokeStyle = this.id;
firstColor.style.border = '1px solid black';
this.style.border = '1px solid white';
lastColor = this;
})
});
//Loop for each tool item :
tools.forEach(element => {
element.addEventListener('click', function() {
if (lastTool) lastTool.style.border = 'none';
elementPen.style.border = 'none';
this.style.border = '1px solid white';
lastTool = this;
})
});
//Loop for each radius item :
radius.forEach(element => {
element.addEventListener('click', function() {
if (lastRadius) lastRadius.style.border = '1px solid black';
firstRadiusSize.style.border = '1px solid black';
this.style.border = '1px solid white';
lastRadius = this;
console.log(this.id)
switch (this.id) {
case "standart":
ctx.lineWidth = 1;
break;
case "small":
ctx.lineWidth = 5;
break;
case "normal":
ctx.lineWidth = 15;
break;
case "bigger":
ctx.lineWidth = 25;
break;
default:
ctx.lineWidth = 1;
}
})
});
}
//Here we draw the line and erase depending on the tool selected :
function draw(e) {
e.preventDefault();
if (tool == "pen")
ctx.globalCompositeOperation = "source-over";
else
ctx.globalCompositeOperation = "destination-out";
ctx.lineTo(getMousePos(e).x, getMousePos(e).y);
ctx.stroke();
}
//Event :
window.addEventListener('load', () => {
OnBegin();
})
canvas.addEventListener("mouseover", () => {
ctx.beginPath();
isPressed = false;
})
canvas.addEventListener('mouseup', () => {
isPressed = false;
ctx.beginPath();
})
elementPen.addEventListener('click', () => {
tool = "pen";
ChangeCursor("pen_cursor");
})
elementErase.addEventListener('click', () => {
tool = "eraser";
ChangeCursor("eraser_cursor");
})
canvas.addEventListener("mousedown", (e) => {
isPressed = true;
draw(e);
})
canvas.addEventListener("mousemove", (e) => {
if (!isPressed) return;
draw(e);
})