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<script context="module">
const color = new Color(0x202020);
color.convertLinearToSRGB();
const color2 = color.clone();
color2.convertSRGBToLinear();
const circleMaterial = new MeshBasicMaterial({
color,
toneMapped: false,
});
</script>
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<script lang="ts">
import { T } from "@threlte/core";
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import { MeshLineGeometry, MeshLineMaterial } from "@threlte/extras";
import { MeshBasicMaterial, type Mesh, LineBasicMaterial } from "three";
import { Color } from "three/src/math/Color.js";
import { CubicBezierCurve } from "three/src/extras/curves/CubicBezierCurve.js";
import { Vector3 } from "three/src/math/Vector3.js";
import { Vector2 } from "three/src/math/Vector2.js";
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export let from: { x: number; y: number };
export let to: { x: number; y: number };
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let samples = 5;
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const curve = new CubicBezierCurve(
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new Vector2(from.x, from.y),
new Vector2(from.x + 2, from.y),
new Vector2(to.x - 2, to.y),
new Vector2(to.x, to.y),
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);
let points: Vector3[] = [];
let last_from_x = 0;
let last_from_y = 0;
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let mesh: Mesh;
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export const update = function (force = false) {
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if (!force) {
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const new_x = from.x + to.x;
const new_y = from.y + to.y;
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if (last_from_x === new_x && last_from_y === new_y) {
return;
}
last_from_x = new_x;
last_from_y = new_y;
}
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const mid = new Vector2((from.x + to.x) / 2, (from.y + to.y) / 2);
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const length = Math.floor(
Math.sqrt(Math.pow(to.x - from.x, 2) + Math.pow(to.y - from.y, 2)) / 4,
);
samples = Math.min(Math.max(10, length), 100);
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curve.v0.set(from.x, from.y);
curve.v1.set(mid.x, from.y);
curve.v2.set(mid.x, to.y);
curve.v3.set(to.x, to.y);
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points = curve.getPoints(samples).map((p) => new Vector3(p.x, 0, p.y));
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};
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update();
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$: if (from || to) {
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update();
}
</script>
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<T.Mesh
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position.x={from.x}
position.z={from.y}
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position.y={0.8}
rotation.x={-Math.PI / 2}
material={circleMaterial}
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>
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<T.CircleGeometry args={[0.3, 16]} />
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</T.Mesh>
<T.Mesh
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position.x={to.x}
position.z={to.y}
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position.y={0.8}
rotation.x={-Math.PI / 2}
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 position.y={0.5} bind:ref={mesh}>
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{#key samples}
<MeshLineGeometry {points} />
{/key}
<MeshLineMaterial
width={4}
attenuate={false}
color={color2}
toneMapped={false}
/>
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</T.Mesh>