113 lines
2.5 KiB
Svelte
113 lines
2.5 KiB
Svelte
<script context="module" lang="ts">
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const color = new Color(0x202020);
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color.convertLinearToSRGB();
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const color2 = color.clone();
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color2.convertSRGBToLinear();
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const circleMaterial = new MeshBasicMaterial({
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color,
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toneMapped: false,
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});
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const lineCache = new Map<number, BufferGeometry>();
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const curve = new CubicBezierCurve(
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new Vector2(0, 0),
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new Vector2(0, 0),
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new Vector2(0, 0),
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new Vector2(0, 0),
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);
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</script>
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<script lang="ts">
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import { T } from "@threlte/core";
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import { MeshLineMaterial } from "@threlte/extras";
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import { BufferGeometry, MeshBasicMaterial, Vector3 } from "three";
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import { Color } from "three/src/math/Color.js";
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import { CubicBezierCurve } from "three/src/extras/curves/CubicBezierCurve.js";
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import { Vector2 } from "three/src/math/Vector2.js";
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import { createEdgeGeometry } from "./createEdgeGeometry";
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export let from: { x: number; y: number };
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export let to: { x: number; y: number };
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let samples = 5;
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let geometry: BufferGeometry;
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let lastId: number | null = null;
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const primeA = 31;
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const primeB = 37;
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export const update = function () {
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const new_x = to.x - from.x;
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const new_y = to.y - from.y;
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const curveId = new_x * primeA + new_y * primeB;
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if (lastId === curveId) {
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return;
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}
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const mid = new Vector2(new_x / 2, new_y / 2);
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if (lineCache.has(curveId)) {
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geometry = lineCache.get(curveId)!;
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return;
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}
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const length = Math.floor(
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Math.sqrt(Math.pow(new_x, 2) + Math.pow(new_y, 2)) / 4,
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);
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samples = Math.min(Math.max(10, length), 60);
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curve.v0.set(0, 0);
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curve.v1.set(mid.x, 0);
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curve.v2.set(mid.x, new_y);
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curve.v3.set(new_x, new_y);
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const points = curve
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.getPoints(samples)
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.map((p) => new Vector3(p.x, 0, p.y))
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.flat();
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geometry = createEdgeGeometry(points);
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lineCache.set(curveId, geometry);
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};
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$: if (from || to) {
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update();
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}
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</script>
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<T.Mesh
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position.x={from.x}
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position.z={from.y}
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position.y={0.8}
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rotation.x={-Math.PI / 2}
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material={circleMaterial}
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>
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<T.CircleGeometry args={[0.3, 16]} />
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</T.Mesh>
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<T.Mesh
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position.x={to.x}
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position.z={to.y}
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position.y={0.8}
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rotation.x={-Math.PI / 2}
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material={circleMaterial}
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>
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<T.CircleGeometry args={[0.3, 16]} />
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</T.Mesh>
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{#if geometry}
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<T.Mesh position.x={from.x} position.z={from.y} position.y={0.1} {geometry}>
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<MeshLineMaterial
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width={4}
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attenuate={false}
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color={color2}
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toneMapped={false}
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/>
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</T.Mesh>
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{/if}
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