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Zerebos
31 lines
969 B
TypeScript
31 lines
969 B
TypeScript
export const ZOOM_MIN = 0.25;
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export const ZOOM_MAX = 4.0;
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export const ZOOM_STEP = 0.1;
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/**
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* Clamp a zoom value between the reader's min/max bounds.
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*/
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export function clampZoom(value: number, min = ZOOM_MIN, max = ZOOM_MAX): number {
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return Math.max(min, Math.min(max, value));
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}
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/**
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* Return the next zoom level after applying a delta, clamped to valid bounds.
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* Rounded to avoid floating point drift.
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*/
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export function adjustZoom(current: number, delta: number): number {
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return clampZoom(Math.round((current + delta) * 1000) / 1000);
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}
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/**
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* Snap to a list of named presets (0.25, 0.5, 0.75, 1.0, 1.5, 2.0, 3.0, 4.0).
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* Returns the nearest preset value to the given zoom.
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*/
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export const ZOOM_PRESETS = [0.25, 0.5, 0.75, 1.0, 1.5, 2.0, 3.0, 4.0] as const;
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export function snapToPreset(value: number): number {
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return ZOOM_PRESETS.reduce((best, preset) =>
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Math.abs(preset - value) < Math.abs(best - value) ? preset : best
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);
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}
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