Java Utililty Methods Polygon Rotate

List of utility methods to do Polygon Rotate

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Description

The list of methods to do Polygon Rotate are organized into topic(s).

Method

voidrotate(Polygon poly, double theta)
rotate 
double sin = Math.sin(theta);
double cos = Math.cos(theta);
for (int i = 0; i < poly.npoints; i++) {
    double x = poly.xpoints[i];
    double y = poly.ypoints[i];
    poly.xpoints[i] = (int) (x * cos - y * sin);
    poly.ypoints[i] = (int) (x * sin + y * cos);
voidrotateCW(Polygon polygon, int height)
rotate CW 
for (int i = 0; i < polygon.npoints; i++) {
    int tmp = polygon.ypoints[i];
    polygon.ypoints[i] = polygon.xpoints[i];
    polygon.xpoints[i] = height - 1 - tmp;
voidrotatePolygon(Polygon pg, double rotAngle, Point centroid, Polygon original)
Rotates a polygon by an angle alpha. 
double x, y;
for (int i = 0; i < pg.npoints; i++) {
    if (original != null) {
        x = original.xpoints[i] - centroid.x;
        y = original.ypoints[i] - centroid.y;
    } else {
        x = pg.xpoints[i] - centroid.x;
        y = pg.ypoints[i] - centroid.y;
...
voidrotatePolygon(Polygon poly, double degree)
Rotates a polygon. 
int[] nx = new int[poly.npoints];
int[] ny = new int[poly.npoints];
for (int i = 0; i < poly.npoints; i++) {
    nx[i] = (int) Math.round(
            ((double) poly.xpoints[i]) * Math.cos(degree) + ((double) poly.ypoints[i]) * Math.sin(degree));
    ny[i] = (int) Math.round(
            ((double) poly.xpoints[i]) * Math.sin(degree) - ((double) poly.ypoints[i]) * Math.cos(degree));
poly.xpoints = nx;
poly.ypoints = ny;