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feat: line preview #2

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feat: line preview #2

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5 changes: 4 additions & 1 deletion index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,10 @@
<title>Drawing App</title>
</head>
<body class="flex flex-col items-center justify-center h-full py-8 px-8 w-full lg:w-4/5 xl:w-3/4 2xl:w-2/3 mx-auto">
<canvas id="canvas" class="w-full max-h-full aspect-video border-2 border-black border-solid mb-8"></canvas>
<div class="relative w-full max-h-full aspect-video border-2 border-black border-solid mb-8">
<canvas id="canvas" class="absolute w-full h-full"></canvas>
<canvas id="preview" class="absolute w-full h-full"></canvas>
</div>
<div class="w-full flex flex-row justify-between">
<div id="colors" class="grid grid-rows-2 grid-cols-4 gap-1 justify-self-start">
<button id="black" class="bg-black setting"></button>
Expand Down
57 changes: 49 additions & 8 deletions js/main.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,20 +3,31 @@ import { colors } from "./colors";

const container = document.getElementById("canvas-container");
const canvas = document.getElementById("canvas");
const preview = document.getElementById("preview");
const width = 1920;
const height = 1080;

// context of the canvas
const context = canvas.getContext("2d");
context.imageSmoothingEnabled = true;
function setupCanvas(canvasToSetup) {
// context of the canvas
const context = canvasToSetup.getContext("2d");
context.imageSmoothingEnabled = true;

// resize canvas (CSS does scale it up or down)
canvas.height = height;
canvas.width = width;
// resize canvas (CSS does scale it up or down)
canvasToSetup.height = height;
canvasToSetup.width = width;
return context;
}

const context = setupCanvas(canvas);
const previewCtx = setupCanvas(preview);

function setColor(e, color) {
context.strokeStyle = colors[color];
context.fillStyle = colors[color];

previewCtx.strokeStyle = colors[color];
previewCtx.fillStyle = colors[color];

selectColor(e);
}

Expand Down Expand Up @@ -76,9 +87,11 @@ function setMode(e, mode) {
case 'path':
window.addEventListener("mousedown", startPath);
window.addEventListener("mouseup", endPath);
window.addEventListener("mousemove", updatePath);

activeEvents['mousedown'] = startPath;
activeEvents['mouseup'] = endPath;
activeEvents['mousemove'] = updatePath;
break;
case 'polygon':
window.addEventListener("mousedown", startPolygon);
Expand Down Expand Up @@ -110,6 +123,9 @@ const sizes = {

function setSize(e, size) {
context.lineWidth = size;

previewCtx.lineWidth = size;

selectSize(e);
}

Expand Down Expand Up @@ -170,12 +186,36 @@ function draw(e) {

// --- Path ---

const startPos = {
x: 0,
y: 0
}

function startPath(e) {
drawing = true;
context.beginPath();

let { x, y } = getMousePos(canvas, e);
startPos.x = x;
startPos.y = y;

draw(e)
}

function updatePath(e) {
if (!drawing) return;
clearCanvas(previewCtx);

let { x: startX, y: startY } = startPos;
let { x, y } = getMousePos(canvas, e);
console.log(startX, startY, x, y);

previewCtx.beginPath();
previewCtx.moveTo(startX, startY);
previewCtx.lineTo(x, y);
previewCtx.stroke();
}

function endPath(e) {
drawing = false;
let { x, y } = getMousePos(canvas, e);
Expand Down Expand Up @@ -242,7 +282,8 @@ function endRect(e) {

// --- Clear ---

function clearCanvas() {
function clearCanvas(context) {
console.log("Clearing canvas");
context.clearRect(0, 0, canvas.width, canvas.height);
}

Expand All @@ -262,7 +303,7 @@ function initialize() {
sizeButton.addEventListener('click', (e) => { setSize(e, sizes[sizeButton.id])} );
}

document.getElementById('clear').addEventListener('click', clearCanvas);
document.getElementById('clear').addEventListener('click', (e) => clearCanvas(context));

// set default settings
context.lineCap = 'round';
Expand Down
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