150 lines
3.6 KiB
JavaScript
150 lines
3.6 KiB
JavaScript
/**
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* @module ol/geom/flat/transform
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*/
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/**
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* @param {Array<number>} flatCoordinates Flat coordinates.
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* @param {number} offset Offset.
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* @param {number} end End.
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* @param {number} stride Stride.
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* @param {import("../../transform.js").Transform} transform Transform.
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* @param {Array<number>} [dest] Destination.
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* @return {Array<number>} Transformed coordinates.
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*/
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export function transform2D(
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flatCoordinates,
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offset,
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end,
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stride,
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transform,
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dest
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) {
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dest = dest ? dest : [];
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let i = 0;
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for (let j = offset; j < end; j += stride) {
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const x = flatCoordinates[j];
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const y = flatCoordinates[j + 1];
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dest[i++] = transform[0] * x + transform[2] * y + transform[4];
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dest[i++] = transform[1] * x + transform[3] * y + transform[5];
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}
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if (dest && dest.length != i) {
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dest.length = i;
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}
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return dest;
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}
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/**
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* @param {Array<number>} flatCoordinates Flat coordinates.
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* @param {number} offset Offset.
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* @param {number} end End.
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* @param {number} stride Stride.
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* @param {number} angle Angle.
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* @param {Array<number>} anchor Rotation anchor point.
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* @param {Array<number>} [dest] Destination.
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* @return {Array<number>} Transformed coordinates.
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*/
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export function rotate(
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flatCoordinates,
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offset,
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end,
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stride,
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angle,
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anchor,
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dest
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) {
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dest = dest ? dest : [];
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const cos = Math.cos(angle);
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const sin = Math.sin(angle);
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const anchorX = anchor[0];
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const anchorY = anchor[1];
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let i = 0;
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for (let j = offset; j < end; j += stride) {
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const deltaX = flatCoordinates[j] - anchorX;
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const deltaY = flatCoordinates[j + 1] - anchorY;
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dest[i++] = anchorX + deltaX * cos - deltaY * sin;
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dest[i++] = anchorY + deltaX * sin + deltaY * cos;
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for (let k = j + 2; k < j + stride; ++k) {
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dest[i++] = flatCoordinates[k];
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}
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}
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if (dest && dest.length != i) {
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dest.length = i;
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}
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return dest;
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}
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/**
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* Scale the coordinates.
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* @param {Array<number>} flatCoordinates Flat coordinates.
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* @param {number} offset Offset.
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* @param {number} end End.
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* @param {number} stride Stride.
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* @param {number} sx Scale factor in the x-direction.
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* @param {number} sy Scale factor in the y-direction.
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* @param {Array<number>} anchor Scale anchor point.
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* @param {Array<number>} [dest] Destination.
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* @return {Array<number>} Transformed coordinates.
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*/
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export function scale(
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flatCoordinates,
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offset,
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end,
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stride,
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sx,
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sy,
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anchor,
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dest
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) {
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dest = dest ? dest : [];
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const anchorX = anchor[0];
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const anchorY = anchor[1];
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let i = 0;
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for (let j = offset; j < end; j += stride) {
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const deltaX = flatCoordinates[j] - anchorX;
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const deltaY = flatCoordinates[j + 1] - anchorY;
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dest[i++] = anchorX + sx * deltaX;
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dest[i++] = anchorY + sy * deltaY;
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for (let k = j + 2; k < j + stride; ++k) {
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dest[i++] = flatCoordinates[k];
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}
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}
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if (dest && dest.length != i) {
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dest.length = i;
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}
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return dest;
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}
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/**
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* @param {Array<number>} flatCoordinates Flat coordinates.
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* @param {number} offset Offset.
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* @param {number} end End.
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* @param {number} stride Stride.
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* @param {number} deltaX Delta X.
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* @param {number} deltaY Delta Y.
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* @param {Array<number>} [dest] Destination.
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* @return {Array<number>} Transformed coordinates.
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*/
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export function translate(
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flatCoordinates,
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offset,
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end,
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stride,
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deltaX,
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deltaY,
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dest
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) {
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dest = dest ? dest : [];
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let i = 0;
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for (let j = offset; j < end; j += stride) {
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dest[i++] = flatCoordinates[j] + deltaX;
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dest[i++] = flatCoordinates[j + 1] + deltaY;
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for (let k = j + 2; k < j + stride; ++k) {
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dest[i++] = flatCoordinates[k];
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}
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}
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if (dest && dest.length != i) {
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dest.length = i;
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}
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return dest;
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}
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