29 lines
1.1 KiB
TypeScript
29 lines
1.1 KiB
TypeScript
import { Data, Floor, Location, Polygon } from "./Components";
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import { Join } from "./Data";
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export function TransformCx(cx: CanvasRenderingContext2D, location: Location, dt = 0) {
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cx.translate(location.X + location.VX * dt, location.Y + location.VY * dt);
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cx.rotate(location.Angle + location.VAngle * dt);
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}
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export function TfPolygon({points}: Polygon, {X, Y, Angle}: Location): Polygon {
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const sin = Math.sin(Angle);
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const cos = Math.cos(Angle);
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const result: Polygon = {points: new Array(points.length)};
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for(let i = 0; i < points.length; i += 2) {
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const x = points[i];
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const y = points[i+1];
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result.points[i] = Floor(x*cos - y*sin + X);
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result.points[i+1] = Floor(x*sin + y*cos + Y);
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}
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return result;
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}
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export function DumbMotion(data: Data, interval: number) {
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Join(data, "location").forEach(([location]) => {
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location.X = Floor(location.X + location.VX * interval);
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location.Y = Floor(location.Y + location.VY * interval);
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location.Angle += location.VAngle * interval;
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});
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}
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