ADD: click function to draw dots

pull/55/head
Eli-b-good 4 years ago
parent 4dd2f9dd57
commit 0b09b37039

@ -1,86 +1,96 @@
const canvas = document.getElementById('canvas');
const increaseBtn = document.getElementById('increase');
const decreaseBtn = document.getElementById('decrease');
const sizeEL = document.getElementById('size');
const colorEl = document.getElementById('color');
const clearEl = document.getElementById('clear');
const canvas = document.getElementById("canvas");
const increaseBtn = document.getElementById("increase");
const decreaseBtn = document.getElementById("decrease");
const sizeEL = document.getElementById("size");
const colorEl = document.getElementById("color");
const clearEl = document.getElementById("clear");
const ctx = canvas.getContext('2d');
const ctx = canvas.getContext("2d");
let size = 10
let isPressed = false
colorEl.value = 'black'
let color = colorEl.value
let x
let y
let size = 10;
let isPressed = false;
colorEl.value = "black";
let color = colorEl.value;
let x;
let y;
canvas.addEventListener('mousedown', (e) => {
isPressed = true
canvas.addEventListener("mousedown", (e) => {
isPressed = true;
x = e.offsetX
y = e.offsetY
})
x = e.offsetX;
y = e.offsetY;
});
canvas.addEventListener('mouseup', (e) => {
isPressed = false
canvas.addEventListener("mouseup", (e) => {
isPressed = false;
x = undefined
y = undefined
})
x = undefined;
y = undefined;
});
canvas.addEventListener('mousemove', (e) => {
canvas.addEventListener("mousemove", (e) => {
if (isPressed) {
const x2 = e.offsetX
const y2 = e.offsetY
const x2 = e.offsetX;
const y2 = e.offsetY;
drawCircle(x2, y2)
drawLine(x, y, x2, y2)
drawCircle(x2, y2);
drawLine(x, y, x2, y2);
x = x2
y = y2
x = x2;
y = y2;
}
})
});
//draw dot when clicked
canvas.addEventListener("click", (e) => {
x = e.offsetX;
y = e.offsetY;
drawCircle(x, y);
});
function drawCircle(x, y) {
ctx.beginPath();
ctx.arc(x, y, size, 0, Math.PI * 2)
ctx.fillStyle = color
ctx.fill()
ctx.arc(x, y, size, 0, Math.PI * 2);
ctx.fillStyle = color;
ctx.fill();
}
function drawLine(x1, y1, x2, y2) {
ctx.beginPath()
ctx.moveTo(x1, y1)
ctx.lineTo(x2, y2)
ctx.strokeStyle = color
ctx.lineWidth = size * 2
ctx.stroke()
ctx.beginPath();
ctx.moveTo(x1, y1);
ctx.lineTo(x2, y2);
ctx.strokeStyle = color;
ctx.lineWidth = size * 2;
ctx.stroke();
}
function updateSizeOnScreen() {
sizeEL.innerText = size
sizeEL.innerText = size;
}
increaseBtn.addEventListener('click', () => {
size += 5
increaseBtn.addEventListener("click", () => {
size += 5;
if (size > 50) {
size = 50
size = 50;
}
updateSizeOnScreen()
})
updateSizeOnScreen();
});
decreaseBtn.addEventListener('click', () => {
size -= 5
decreaseBtn.addEventListener("click", () => {
size -= 5;
if (size < 5) {
size = 5
size = 5;
}
updateSizeOnScreen()
})
updateSizeOnScreen();
});
colorEl.addEventListener('change', (e) => color = e.target.value)
colorEl.addEventListener("change", (e) => (color = e.target.value));
clearEl.addEventListener('click', () => ctx.clearRect(0,0, canvas.width, canvas.height))
clearEl.addEventListener("click", () =>
ctx.clearRect(0, 0, canvas.width, canvas.height)
);

Loading…
Cancel
Save