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Factor out ol.geom.flat.transform

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This commit is contained in:
Tom Payne
2014-03-12 13:18:29 +01:00
parent 6a00c14841
commit ca44c6328c
5 changed files with 43 additions and 39 deletions
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34
src/ol/geom/flat/transformflatgeom.js Normal file
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@@ -0,0 +1,34 @@
goog.provide('ol.geom.flat.transform');
goog.require('goog.vec.Mat4');
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} stride Stride.
* @param {goog.vec.Mat4.Number} transform Transform.
* @param {Array.<number>=} opt_dest Destination.
* @return {Array.<number>} Transformed coordinates.
*/
ol.geom.flat.transform.transform2D =
function(flatCoordinates, stride, transform, opt_dest) {
var m00 = goog.vec.Mat4.getElement(transform, 0, 0);
var m10 = goog.vec.Mat4.getElement(transform, 1, 0);
var m01 = goog.vec.Mat4.getElement(transform, 0, 1);
var m11 = goog.vec.Mat4.getElement(transform, 1, 1);
var m03 = goog.vec.Mat4.getElement(transform, 0, 3);
var m13 = goog.vec.Mat4.getElement(transform, 1, 3);
var dest = goog.isDef(opt_dest) ? opt_dest : [];
var i = 0;
var j, jj;
for (j = 0, jj = flatCoordinates.length; j < jj; j += stride) {
var x = flatCoordinates[j];
var y = flatCoordinates[j + 1];
dest[i++] = m00 * x + m01 * y + m03;
dest[i++] = m10 * x + m11 * y + m13;
}
if (goog.isDef(opt_dest) && dest.length != i) {
dest.length = i;
}
return dest;
};