122 lines
3.7 KiB
JavaScript
122 lines
3.7 KiB
JavaScript
goog.provide('ol.geom.flat.transform');
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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 {ol.Transform} transform Transform.
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* @param {Array.<number>=} opt_dest Destination.
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* @return {Array.<number>} Transformed coordinates.
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*/
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ol.geom.flat.transform.transform2D = function(flatCoordinates, offset, end, stride, transform, opt_dest) {
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var dest = opt_dest ? opt_dest : [];
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var i = 0;
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var j;
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for (j = offset; j < end; j += stride) {
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var x = flatCoordinates[j];
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var 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 (opt_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>=} opt_dest Destination.
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* @return {Array.<number>} Transformed coordinates.
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*/
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ol.geom.flat.transform.rotate = function(flatCoordinates, offset, end, stride, angle, anchor, opt_dest) {
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var dest = opt_dest ? opt_dest : [];
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var cos = Math.cos(angle);
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var sin = Math.sin(angle);
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var anchorX = anchor[0];
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var anchorY = anchor[1];
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var i = 0;
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for (var j = offset; j < end; j += stride) {
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var deltaX = flatCoordinates[j] - anchorX;
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var 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 (var 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 (opt_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>=} opt_dest Destination.
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* @return {Array.<number>} Transformed coordinates.
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*/
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ol.geom.flat.transform.scale = function(flatCoordinates, offset, end, stride, sx, sy, anchor, opt_dest) {
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var dest = opt_dest ? opt_dest : [];
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var anchorX = anchor[0];
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var anchorY = anchor[1];
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var i = 0;
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for (var j = offset; j < end; j += stride) {
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var deltaX = flatCoordinates[j] - anchorX;
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var 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 (var 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 (opt_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>=} opt_dest Destination.
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* @return {Array.<number>} Transformed coordinates.
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*/
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ol.geom.flat.transform.translate = function(flatCoordinates, offset, end, stride, deltaX, deltaY, opt_dest) {
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var dest = opt_dest ? opt_dest : [];
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var i = 0;
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var j, k;
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for (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 (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 (opt_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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