52 lines
2.1 KiB
TypeScript
52 lines
2.1 KiB
TypeScript
/**
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* The viewport transforms used to be private methods of a Pixi widget and could only be
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* checked through the browser. They are plain geometry, so they are pinned here.
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*/
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import { describe, expect, it } from 'vitest';
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import { cameraView, freeView, isInside, screenToWorld, worldBounds, worldToScreen } from '../../src/viewport/view';
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describe('freeView', () => {
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it('puts the view centre in the middle of the widget', () => {
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const view = freeView(50, -20, 2, 800, 600);
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expect(worldToScreen(view, 50, -20)).toEqual({ x: 400, y: 300 });
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expect(screenToWorld(view, 400, 300)).toEqual({ x: 50, y: -20 });
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});
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it('scales distances by the zoom', () => {
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const view = freeView(0, 0, 2, 800, 600);
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expect(worldToScreen(view, 100, 0)).toEqual({ x: 600, y: 300 });
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});
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it('round-trips any point', () => {
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const view = freeView(13, -7, 0.35, 640, 480);
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const back = screenToWorld(view, ...Object.values(worldToScreen(view, 123, -456)) as [number, number]);
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expect(back.x).toBeCloseTo(123, 9);
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expect(back.y).toBeCloseTo(-456, 9);
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});
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it('covers the widget in world units', () => {
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const bounds = worldBounds(freeView(0, 0, 2, 800, 600));
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expect(bounds).toEqual({ left: -200, top: -150, right: 200, bottom: 150 });
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});
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});
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describe('cameraView', () => {
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const camera = { x: 10, y: 20, props: { width: 640, height: 360 } };
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it('fits the camera frame into the widget and centres it', () => {
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// 640×360 into 800×600: width is the tighter fit (1.25 vs 1.67), so bars top and bottom.
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const view = cameraView(camera, 800, 600);
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expect(view.scale).toBeCloseTo(1.25, 9);
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expect(view.rect).toEqual({ x: 0, y: 75, w: 800, h: 450 });
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// The camera position sits at the centre of the frame, not of the widget.
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expect(worldToScreen(view, 10, 20)).toEqual({ x: 400, y: 300 });
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});
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it('reports the letterbox as outside', () => {
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const view = cameraView(camera, 800, 600);
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expect(isInside(view, 400, 300)).toBe(true);
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expect(isInside(view, 400, 20)).toBe(false); // top bar
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expect(isInside(view, 400, 580)).toBe(false); // bottom bar
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});
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});
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