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Copy pathVideoMapUtil.js
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160 lines (138 loc) · 4.37 KB
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export const transformCoord = ({
videoPoint,
originCoordsRightBottom,
originCoordsLeftTop,
videoHeight,
videoWidth
}) => {
let perWidth = Math.abs(originCoordsRightBottom.lng - originCoordsLeftTop.lng) / videoWidth;
let perHeight = Math.abs(originCoordsRightBottom.lat - originCoordsLeftTop.lat) / videoHeight;
return [videoPoint[0] * perWidth + originCoordsLeftTop.lng, originCoordsLeftTop.lat - videoPoint[1] * perHeight];
};
export const transformCoordReverse = ({
coord,
originCoordsRightBottom,
originCoordsLeftTop,
videoHeight,
videoWidth
}) => {
let perWidth = Math.abs(originCoordsRightBottom.lng - originCoordsLeftTop.lng) / videoWidth;
let perHeight = Math.abs(originCoordsRightBottom.lat - originCoordsLeftTop.lat) / videoHeight;
return [(coord[0] - originCoordsLeftTop.lng) / perWidth, (originCoordsLeftTop.lat - coord[1]) / perHeight];
};
export const fovXToFx = (fovX, videoWidth) => {
return videoWidth / (2 * Math.tan(fovX / 2 * Math.PI / 180));
}
export const fovYToFy = (fovY, videoHeight) => {
return videoHeight / (2 * Math.tan(fovY / 2 * Math.PI / 180));
}
/**
* @private
*/
export class FastRangeSearcher {
constructor(sortedArray) {
this.data = sortedArray.map(n => Math.round(n * 1000));
}
findNearest(target) {
const targetInt = Math.round(target * 1000);
const minVal = targetInt;
const maxVal = targetInt + 3000;
let closestIndex = -1;
let minDiff = Infinity;
for (let i = 0; i < this.data.length; i++) {
const current = this.data[i];
if (current > maxVal) {
break
}
if (current >= minVal) {
const diff = current - targetInt;
if (diff < minDiff) {
minDiff = diff;
closestIndex = i;
}
}
}
if (closestIndex !== -1) {
return {
value: +(this.data[closestIndex] / 1000).toFixed(3)
};
}
return null;
}
}
/**
* @private
* @param {Object} params 配置参数
* @param {number} params.interval 目标时间间隔（秒，≥0.001）
* @param {Array} params.data 时间序列数据
* @returns {Array} 处理结果
*/
export function smartTimeProcessor(interval, data, properties = []) {
if (interval < 0.001) {
throw new Error("time interval can't' less than 0.001");
}
if (!data || data.length === 0) {
return [];
}
const processed = data.map(p => ({
...p,
time: Math.round(p.time * 1000)
}));
// 计算最小原始间隔和有效时间范围
let minInterval = Infinity;
for (let i = 1; i < processed.length; i++) {
minInterval = Math.min(minInterval, processed[i].time - processed[i-1].time);
}
const targetInterval = Math.round(interval * 1000);
const [startMs, endMs] = [
processed[0].time,
processed[processed.length - 1].time
];
if (targetInterval === minInterval) {
return data;
}
const useInterpolation = targetInterval < minInterval;
let result = [];
let dataPtr = 0;
for (let t = startMs; t <= endMs; t += targetInterval) {
while (dataPtr < processed.length - 1 && processed[dataPtr + 1].time < t) {
dataPtr++;
}
const current = processed[dataPtr];
const next = processed[dataPtr + 1] || current;
if (useInterpolation) {
const ratio = next.time === current.time ? 0 : (t - current.time) / (next.time - current.time);
let res = {};
properties.forEach(prop => {
if (prop === 'extent') {
res[prop] = current[prop].map((item, index) => {
return [current[prop][index].x + (next[prop][index].x - current[prop][index].x) * ratio, current[prop][index].y + (next[prop][index].y - current[prop][index].y) * ratio];
});
} else {
const value = current[prop] + (next[prop] - current[prop]) * ratio;
res[prop] = +value;
}
});
result.push({
...current,
time: +((t / 1000).toFixed(3)),
...res
});
} else {
if (current.time === t) {
result.push(formatPoint(current));
dataPtr++;
} else if (next.time === t) {
result.push(formatPoint(next));
dataPtr++;
}
}
}
return result;
}
function formatPoint(point) {
return {
...point,
time: +(point.time / 1000).toFixed(3)
};
}