| 1 | class ZoomHistory {
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| 2 | lastZoom: number;
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| 3 | lastFloorZoom: number;
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| 4 | lastIntegerZoom: number;
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| 5 | lastIntegerZoomTime: number;
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| 6 | first: boolean;
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| 7 |
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| 8 | constructor() {
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| 9 | this.first = true;
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| 10 | }
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| 11 |
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| 12 | update(z: number, now: number) {
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| 13 | const floorZ = Math.floor(z);
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| 14 |
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| 15 | if (this.first) {
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| 16 | this.first = false;
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| 17 | this.lastIntegerZoom = floorZ;
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| 18 | this.lastIntegerZoomTime = 0;
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| 19 | this.lastZoom = z;
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| 20 | this.lastFloorZoom = floorZ;
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| 21 | return true;
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| 22 | }
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| 23 |
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| 24 | if (this.lastFloorZoom > floorZ) {
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| 25 | this.lastIntegerZoom = floorZ + 1;
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| 26 | this.lastIntegerZoomTime = now;
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| 27 | } else if (this.lastFloorZoom < floorZ) {
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| 28 | this.lastIntegerZoom = floorZ;
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| 29 | this.lastIntegerZoomTime = now;
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| 30 | }
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| 31 |
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| 32 | if (z !== this.lastZoom) {
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| 33 | this.lastZoom = z;
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| 34 | this.lastFloorZoom = floorZ;
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| 35 | return true;
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| 36 | }
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| 37 |
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| 38 | return false;
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| 39 | }
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| 40 | }
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| 41 |
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| 42 | export default ZoomHistory;
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