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import { BASE_TIMELINE_PIXELS_PER_SECOND } from "@/lib/timeline/scale";
export const TIMELINE_INDICATOR_LINE_WIDTH_PX = 2;
function getDevicePixelRatio({
devicePixelRatio,
}: {
devicePixelRatio?: number;
}): number {
if (
typeof devicePixelRatio === "number" &&
Number.isFinite(devicePixelRatio) &&
devicePixelRatio > 0
) {
return devicePixelRatio;
}
if (typeof window === "undefined") {
return 1;
}
if (Number.isFinite(window.devicePixelRatio) && window.devicePixelRatio > 0) {
return window.devicePixelRatio;
}
return 1;
}
export function getTimelinePixelsPerSecond({
zoomLevel,
}: {
zoomLevel: number;
}): number {
return BASE_TIMELINE_PIXELS_PER_SECOND * zoomLevel;
}
export function timelineTimeToPixels({
time,
zoomLevel,
}: {
time: number;
zoomLevel: number;
}): number {
return time * getTimelinePixelsPerSecond({ zoomLevel });
}
export function snapPixelToDeviceGrid({
pixel,
devicePixelRatio,
}: {
pixel: number;
devicePixelRatio?: number;
}): number {
const safeDevicePixelRatio = getDevicePixelRatio({ devicePixelRatio });
return Math.round(pixel * safeDevicePixelRatio) / safeDevicePixelRatio;
}
export function timelineTimeToSnappedPixels({
time,
zoomLevel,
devicePixelRatio,
}: {
time: number;
zoomLevel: number;
devicePixelRatio?: number;
}): number {
const rawPixel = timelineTimeToPixels({ time, zoomLevel });
return snapPixelToDeviceGrid({ pixel: rawPixel, devicePixelRatio });
}
export function getCenteredLineLeft({
centerPixel,
lineWidthPx = TIMELINE_INDICATOR_LINE_WIDTH_PX,
}: {
centerPixel: number;
lineWidthPx?: number;
}): number {
return centerPixel - lineWidthPx / 2;
}
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