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Contents
package toxi.geom;
import java.util.ArrayList;
import java.util.List;
import toxi.math.ScaleMap;
/**
* A concrete implementation of the abstract {@link GridTesselator} using a grid
* in polygon-local coordinate space for generating additional points within a
* polygon. The resolution setting of this class defines number of desired grid
* points in X & Y direction. E.g. a resolution of 10 means up to 10x10 grid
* points are created a within the polygon bounding rect. For smaller polygons,
* the resulting triangles will simply be smaller too. This resolution is used
* independently on polygon size. Use the {@link GlobalGridTesselator} for an
* alternative behavior, resulting in more uniformly sized triangles.
*
* @see GridTesselator
* @see GlobalGridTesselator
* @see PolygonTesselator
*/
public class LocalGridTesselator extends GridTesselator {
/**
*
* @param res
*/
public LocalGridTesselator(int res) {
super(res);
}
/**
*
* @param poly
* @param bounds
* @return
*/
@Override
protected List<Vec2D> createInsidePoints(Polygon2D poly, Rect bounds) {
List<Vec2D> points = new ArrayList<>();
int ires = (int) res;
ScaleMap xmap = new ScaleMap(0, ires, bounds.getLeft(),
bounds.getRight());
ScaleMap ymap = new ScaleMap(0, ires, bounds.getTop(),
bounds.getBottom());
for (int y = 0; y < ires; y++) {
float yy = (float) ymap.getMappedValueFor(y);
for (int x = 0; x < ires; x++) {
Vec2D p = new Vec2D((float) xmap.getMappedValueFor(x), yy);
if (poly.containsPoint(p)) {
points.add(p);
}
}
}
return points;
}
}
Version data entries
11 entries across 11 versions & 1 rubygems