artworld/examples/dataclock.html
2025-03-09 22:57:34 -05:00

58 lines
1.8 KiB
HTML

<html>
<head> </head>
<body>
<canvas id="mainCanvas" width="500" height="500"></canvas>
<script type="module">
import {
World,
Color,
Pico8,
Group,
Rect,
Random,
Vector2,
Line,
Circle,
Var,
degToRad,
} from "../artworld/index.js";
let world = new World("mainCanvas");
window.world = world;
// This is an experiment to separate the declaration of
// "what the data does" from "what it looks like".
// First we use `Var` to define "what the data does"
// variables are expected to regularly *vary*!
// Variables are defined as functions that update with time.
// It is also possible to define static variables.
let color = world.var(
(t) =>
[Pico8.RED, Pico8.ORANGE, Pico8.GREEN, Pico8.BLUE][
Math.floor(t / 60) % 4
],
);
// We can create dependencies between them: here the inner & outer
// radii should be 10 pixels apart.
let outerR = world.var((t) => Math.sin(t / 100) * 50 + 200);
let innerR = world.var(() => outerR.getValue() - 10);
// We take this composition a bit further here, the radius of the clock
// hand grows & shrinks with the edge.
let lineTo = world.var((t) => {
let angle = (t / 6000) * Math.PI * 2;
return Vector2.polar(innerR.getValue(), angle);
});
let g = new Group().pos(new Vector2(250, 250));
world.drawable(g);
new Circle(g).fill(Pico8.BLACK).z(1).radius(outerR);
new Circle(g).z(10).fill(color).radius(innerR);
new Circle(g).radius(20).fill(Pico8.BLACK).z(50);
new Line(g).to(lineTo).z(100);
world.loopStep();
</script>
</body>
</html>