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import { describe, expect, test } from "bun:test";
import { registerDefaultEffects } from "@/effects";
import { buildDefaultEffectInstance } from "@/effects";
import { applyMotionEffects, sampleEasingBezier } from "@/effects/motion";
import type { Transform } from "@/rendering";
import { GraphicNode } from "@/services/renderer/nodes/graphic-node";
import { resolveRenderTree } from "@/services/renderer/resolve";
import type { CanvasRenderer } from "@/services/renderer/canvas-renderer";
registerDefaultEffects();
const baseTransform: Transform = {
scaleX: 1,
scaleY: 1,
position: { x: 0, y: 0 },
rotate: 0,
};
function applyZoomIn({
localTime,
duration = 10,
intensity = 100,
easing = "linear",
}: {
localTime: number;
duration?: number;
intensity?: number;
easing?: string;
}) {
const effect = buildDefaultEffectInstance({ effectType: "zoom-in" });
effect.params.intensity = intensity;
effect.params.easing = easing;
return applyMotionEffects({
baseTransform,
effects: [effect],
animations: undefined,
localTime,
duration,
canvasWidth: 1920,
canvasHeight: 1080,
});
}
describe("sampleEasingBezier", () => {
test("linear easing is identity", () => {
expect(sampleEasingBezier({ bezier: [0, 0, 1, 1], x: 0.37 })).toBeCloseTo(
0.37,
5,
);
});
test("preserves endpoints", () => {
expect(sampleEasingBezier({ bezier: [0.4, 0, 0.2, 1], x: 0 })).toBeCloseTo(
0,
5,
);
expect(sampleEasingBezier({ bezier: [0.4, 0, 0.2, 1], x: 1 })).toBeCloseTo(
1,
5,
);
});
test("ease-in lags behind linear progress mid-way", () => {
const eased = sampleEasingBezier({ bezier: [0.8, 0, 1, 1], x: 0.5 });
expect(eased).toBeLessThan(0.5);
});
});
describe("applyMotionEffects", () => {
test("zoom-in ramps scale from 1 to full range over the clip", () => {
expect(applyZoomIn({ localTime: 0 }).scaleX).toBeCloseTo(1, 5);
expect(applyZoomIn({ localTime: 10 }).scaleX).toBeCloseTo(1.35, 5);
});
test("intensity scales the effect proportionally", () => {
const full = applyZoomIn({ localTime: 10, intensity: 100 });
const fifth = applyZoomIn({ localTime: 10, intensity: 20 });
expect(fifth.scaleX).toBeCloseTo(1.07, 5);
expect((fifth.scaleX - 1) / (full.scaleX - 1)).toBeCloseTo(0.2, 5);
});
test("eased zoom is non-linear at the midpoint", () => {
const eased = applyZoomIn({ localTime: 5, easing: "ease-in" });
expect(eased.scaleX).toBeLessThan(1.175);
expect(eased.scaleX).toBeGreaterThan(1);
});
test("zoom-out starts zoomed and settles at 1", () => {
const effect = buildDefaultEffectInstance({ effectType: "zoom-out" });
effect.params.easing = "linear";
const apply = (localTime: number) =>
applyMotionEffects({
baseTransform,
effects: [effect],
animations: undefined,
localTime,
duration: 10,
canvasWidth: 1920,
canvasHeight: 1080,
});
expect(apply(0).scaleX).toBeCloseTo(1.35, 5);
expect(apply(10).scaleX).toBeCloseTo(1, 5);
});
test("pan-right drifts position across the canvas with zoom headroom", () => {
const effect = buildDefaultEffectInstance({ effectType: "pan-right" });
effect.params.easing = "linear";
const apply = (localTime: number) =>
applyMotionEffects({
baseTransform,
effects: [effect],
animations: undefined,
localTime,
duration: 10,
canvasWidth: 1920,
canvasHeight: 1080,
});
const start = apply(0);
const end = apply(10);
expect(start.position.x).toBeCloseTo(-0.06 * 1920, 3);
expect(end.position.x).toBeCloseTo(0.06 * 1920, 3);
expect(end.scaleX).toBeCloseTo(1.15, 5);
expect(end.scaleX).toBe(end.scaleY);
});
test("multiplies onto an existing base transform", () => {
const scaledBase: Transform = { ...baseTransform, scaleX: 2, scaleY: 2 };
const effect = buildDefaultEffectInstance({ effectType: "zoom-in" });
effect.params.easing = "linear";
const resolved = applyMotionEffects({
baseTransform: scaledBase,
effects: [effect],
animations: undefined,
localTime: 10,
duration: 10,
canvasWidth: 1920,
canvasHeight: 1080,
});
expect(resolved.scaleX).toBeCloseTo(2.7, 5);
});
test("ignores disabled effects and effects without motion", () => {
const motion = buildDefaultEffectInstance({ effectType: "zoom-in" });
motion.enabled = false;
const blur = buildDefaultEffectInstance({ effectType: "blur" });
const resolved = applyMotionEffects({
baseTransform,
effects: [motion, blur],
animations: undefined,
localTime: 5,
duration: 10,
canvasWidth: 1920,
canvasHeight: 1080,
});
expect(resolved).toEqual(baseTransform);
});
});
describe("renderer wiring", () => {
test("resolveRenderTree applies motion presets to the resolved transform", async () => {
const effect = buildDefaultEffectInstance({ effectType: "zoom-in" });
effect.params.easing = "linear";
const node = new GraphicNode({
definitionId: "rectangle",
params: {},
duration: 10,
timeOffset: 0,
trimStart: 0,
trimEnd: 0,
transform: baseTransform,
opacity: 1,
effects: [effect],
});
const renderer = { width: 1920, height: 1080 } as CanvasRenderer;
await resolveRenderTree({ node, renderer, time: 0 });
expect(node.resolved?.transform.scaleX).toBeCloseTo(1, 5);
await resolveRenderTree({ node, renderer, time: 5 });
expect(node.resolved?.transform.scaleX).toBeCloseTo(1.175, 5);
});
});
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