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script.js
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script.js
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let canvas = document.getElementById("canvas");
let brush = document.getElementById("brush");
let tools = document.querySelectorAll(".tools");
let clear = document.getElementById("clear");
let save = document.getElementById("save");
let ctx = canvas.getContext("2d", { willReadFrequently: false });
let isDraw = false;
let preX, preY;
let sizeSlider = document.getElementById("mySize");
let fillCheck = document.getElementById("fillColor");
let colors = document.querySelectorAll(".color-circle");
let colorPicker = document.getElementById('color-picker')
let isfillColor;
let selectedTool,
selectedColor,
brushSize = sizeSlider.value;
var window_width = window.innerWidth;
var window_height = window.innerHeight;
canvas.width = window_width;
canvas.height = window_height;
window.onresize = () => {
var window_width = window.innerWidth;
var window_height = window.innerHeight;
canvas.width = window_width;
canvas.height = window_height;
};
const drawRect = (e) => {
// ctx.clearRect(0, 0, canvas.width, canvas.height);
// ctx.clearRect(preX, preY, e.x - preX, e.y - preY);
// ctx.strokeStyle = "black";
// ctx.fillStyle = 'transparent';
//draw
if (isfillColor) {
return ctx.fillRect(
e.offsetX,
e.offsetY,
preX - e.offsetX,
preY - e.offsetY
);
}
ctx.strokeRect(e.offsetX, e.offsetY, preX - e.offsetX, preY - e.offsetY);
};
const drawCicle = (e) => {
ctx.beginPath();
// ctx.clearRect(0, 0, canvas.width, canvas.height);
let radius = Math.sqrt(
Math.pow(preX - e.offsetX, 2) + Math.pow(preY - e.offsetY, 2)
);
// ctx.clearRect(preX, preY, e.x - preX, e.y - preY);
// ctx.strokeStyle = "black";
// ctx.fillStyle = 'transparent';
//draw
ctx.arc(preX, preY, radius, 0, 2 * Math.PI);
isfillColor ? ctx.fill() : ctx.stroke();
};
const drawTriangle = (e) => {
ctx.beginPath(); // creating new path to draw circle
ctx.moveTo(preX, preY); // moving triangle to the mouse pointer
ctx.lineTo(e.offsetX, e.offsetY); // creating first line according to the mouse pointer
ctx.lineTo(preX * 2 - e.offsetX, e.offsetY); // creating bottom line of triangle
ctx.closePath(); // closing path of a triangle so the third line draw automatically
// fillColor.checked ? ctx.fill() : ctx.stroke(); // if fillColor is checked fill triangle else draw border
isfillColor ? ctx.fill() : ctx.stroke();
};
const drawing = (e) => {
if (!isDraw) {
return;
}
ctx.putImageData(snapshot, 0, 0);
if (selectedTool === "brush" || selectedTool === "eraser") {
ctx.strokeStyle = selectedTool === "eraser" ? "#fff" : selectedColor;
ctx.lineTo(e.offsetX, e.offsetY);
ctx.stroke();
} else if (selectedTool === "rectangle") {
drawRect(e);
} else if (selectedTool === "circle") {
drawCicle(e);
} else if (selectedTool === "triangle") {
drawTriangle(e);
}
};
const startDrawing = (e) => {
isDraw = true;
preX = e.offsetX;
preY = e.offsetY;
ctx.beginPath();
ctx.lineWidth = brushSize;
ctx.lineJoin = 'round';
ctx.lineCap = 'round';
ctx.lineColor = selectedColor;
ctx.fillStyle = selectedColor;
ctx.strokeStyle = selectedColor;
ctx.moveTo(e.offsetX, e.offsetY);
snapshot = ctx.getImageData(0, 0, canvas.width, canvas.height);
};
tools?.forEach((btn) => {
// selectedTool = btn.id;
btn.addEventListener("click", () => {
selectedTool = btn.id;
document.querySelector(".selected")?.classList.remove("selected");
btn.classList.add("selected");
});
});
clear.addEventListener("click", (e) => {
ctx.clearRect(0, 0, canvas.width, canvas.height);
});
save.addEventListener("click", () => {
const link = document.createElement("a"); // creating <a> element
link.download = `${Date.now()}.png`; // passing current date as link download value
link.href = canvas.toDataURL(); // passing canvasData as link href value
link.click();
});
sizeSlider.addEventListener("change", () => {
brushSize = sizeSlider.value;
});
fillCheck.addEventListener("change", () => {
isfillColor = fillCheck.checked;
});
colors?.forEach((color) => {
color.addEventListener("click", () => {
document.querySelector(".color-selected")?.classList.remove("color-selected");
color.classList.add("color-selected");
if (color.id === 'multiColor'){
colorPicker.addEventListener("change",(e) => {
// Get the selected color value
selectedColor = e.target.value;
colorPicker.parentElement.style.background = selectedColor;
});
}else{
selectedColor = color.id;
}
// selectedColor = window.getComputedStyle(color).getPropertyValue("background-color");
});
});
canvas.addEventListener("mousedown", startDrawing);
canvas.addEventListener("mousemove", drawing);
canvas.addEventListener("mouseup", () => {
isDraw = false;
});