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Html5 #17

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Merged
wcski merged 2 commits into from
Nov 2, 2017
Merged

Html5 #17

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9c6a341
started HTML5 canvas work
Nov 1, 2017
80768ff
added working canvas drawer
Nov 2, 2017
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48 changes: 48 additions & 0 deletions 08 - Fun with HTML5 Canvas/index-START.html
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,54 @@
<body>
<canvas id="draw" width="800" height="800"></canvas>
<script>
const canvas = document.querySelector('#draw');
const ctx = canvas.getContext('2d');
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
ctx.strokeStyle='#BADA55';
ctx.lineJoin = 'round';
ctx.lineCap = 'round';
ctx.lineWidth = 100;


let isDrawing = false;
let lastX = 0;
let lastY = 0;
let hue = 0;
let direction = true;

function draw(e) {
if (!isDrawing)
return; // stop the function from running when they are not moused down
console.log(e);
ctx.strokeStyle = `hsl(${hue}, 100%, 50%)`;
ctx.beginPath();
ctx.moveTo(lastX, lastY);
ctx.lineTo(e.offsetX, e.offsetY);
ctx.stroke();
[lastX, lastY] = [e.offsetX, e.offsetY];

hue++;
if (hue >= 360) {
hue = 0;
}
if (ctx.lineWidth >= 100 || ctx.lineWidth <= 1) {
direction = !direction;
}
if (direction) {
ctx.lineWidth++;
} else {
ctx.lineWidth--;
}
};

canvas.addEventListener('mousemove', draw);
canvas.addEventListener('mousedown', (e) => {
isDrawing = true;
[lastX, lastY] = [e.offsetX, e.offsetY];
});
canvas.addEventListener('mouseup', () => isDrawing = false);
canvas.addEventListener('mouseout', () => isDrawing = false);
</script>

<style>
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