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import type { Camera } from "../cameras/Camera";
import { Matrix3 } from "../math/Matrix3";
import { Vector3 } from "../math/Vector3";
class OrbitControls {
minBeta: number = (5 * Math.PI) / 180;
maxBeta: number = (85 * Math.PI) / 180;
minZoom: number = 0.1;
maxZoom: number = 30;
orbitSpeed: number = 1;
panSpeed: number = 1;
zoomSpeed: number = 1;
dampening: number = 0.3;
update: () => void;
dispose: () => void;
constructor(camera: Camera, domElement: HTMLElement) {
let target = new Vector3();
let alpha = 0;
let beta = 0;
let radius = 5;
let desiredTarget = target.clone();
let desiredAlpha = alpha;
let desiredBeta = beta;
let desiredRadius = radius;
let dragging = false;
let panning = false;
let lastX = 0;
let lastY = 0;
const computeZoomNorm = () => {
return 0.1 + (0.9 * (desiredRadius - this.minZoom)) / (this.maxZoom - this.minZoom);
};
const onPointerDown = (e: PointerEvent) => {
e.preventDefault();
e.stopPropagation();
dragging = true;
if (e.pointerType === "touch") {
panning = e.pointerId === 2;
} else {
panning = e.button === 2;
}
lastX = e.clientX;
lastY = e.clientY;
window.addEventListener("pointerup", onPointerUp);
window.addEventListener("pointercancel", onPointerUp);
};
const onPointerUp = (e: PointerEvent) => {
e.preventDefault();
e.stopPropagation();
dragging = false;
panning = false;
window.removeEventListener("pointerup", onPointerUp);
window.removeEventListener("pointercancel", onPointerUp);
};
const onPointerMove = (e: PointerEvent) => {
e.preventDefault();
e.stopPropagation();
if (!dragging) return;
const dx = e.clientX - lastX;
const dy = e.clientY - lastY;
const zoomNorm = computeZoomNorm();
if (panning) {
const panX = -dx * this.panSpeed * 0.01 * zoomNorm;
const panY = -dy * this.panSpeed * 0.01 * zoomNorm;
const R = camera.rotation.buffer;
const right = new Vector3(R[0], R[3], R[6]);
const up = new Vector3(R[1], R[4], R[7]);
desiredTarget.add(right.multiply(panX));
desiredTarget.add(up.multiply(panY));
} else {
desiredAlpha -= dx * this.orbitSpeed * 0.005;
desiredBeta += dy * this.orbitSpeed * 0.005;
desiredBeta = Math.min(Math.max(desiredBeta, this.minBeta), this.maxBeta);
}
lastX = e.clientX;
lastY = e.clientY;
};
const onWheel = (e: WheelEvent) => {
e.preventDefault();
e.stopPropagation();
const zoomNorm = computeZoomNorm();
desiredRadius += e.deltaY * this.zoomSpeed * 0.02 * zoomNorm;
desiredRadius = Math.min(Math.max(desiredRadius, this.minZoom), this.maxZoom);
};
const lerp = (a: number, b: number, t: number) => {
return (1 - t) * a + t * b;
};
this.update = () => {
alpha = lerp(alpha, desiredAlpha, this.dampening);
beta = lerp(beta, desiredBeta, this.dampening);
radius = lerp(radius, desiredRadius, this.dampening);
target = target.lerp(desiredTarget, this.dampening);
const x = target.x + radius * Math.sin(alpha) * Math.cos(beta);
const y = target.y - radius * Math.sin(beta);
const z = target.z - radius * Math.cos(alpha) * Math.cos(beta);
camera.position.set(x, y, z);
const direction = target.clone().subtract(camera.position).normalize();
const rx = Math.asin(-direction.y);
const ry = Math.atan2(direction.x, direction.z);
camera.rotation = Matrix3.RotationFromEuler(new Vector3(rx, ry, 0));
};
this.dispose = () => {
domElement.removeEventListener("pointerdown", onPointerDown);
domElement.removeEventListener("pointermove", onPointerMove);
domElement.removeEventListener("wheel", onWheel);
};
domElement.addEventListener("pointerdown", onPointerDown);
domElement.addEventListener("pointermove", onPointerMove);
domElement.addEventListener("wheel", onWheel);
this.update();
}
}
export { OrbitControls };
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