Java Utililty Methods Graphics Rotate

List of utility methods to do Graphics Rotate

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Description

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

Method

voidrotateArea(Area a, double rotation, Point2D rotateAround)
rotate Area 
AffineTransform at1 = AffineTransform.getTranslateInstance(rotateAround.getX(), rotateAround.getY());
at1.rotate(rotation);
at1.translate(-rotateAround.getX(), -rotateAround.getY());
a.transform(at1);
voidrotateBy(Vector points, double theta, Vector newPoints)
rotate By 
Point2D c = centroid(points);
Point2D ptSrc, ptDest;
for (int i = 0; i < points.size(); i++) {
    ptSrc = points.get(i);
    if (newPoints.size() > i) {
        ptDest = newPoints.get(i);
    } else {
        ptDest = new Point2D.Double();
...
Point2DrotateByAngle(final Point2D pos, final Point2D center, final double angle)
Rotates a point a given angle around the center. 
final AffineTransform at = AffineTransform.getRotateInstance(angle, center.getX(), center.getY());
return at.transform(pos, null);
voidrotateClockwise(Path source, Path target)
rotate Clockwise 
BufferedImage srcImage = ImageIO.read(source.toFile());
int width = srcImage.getWidth();
int height = srcImage.getHeight();
BufferedImage targetImage = new BufferedImage(height, width, srcImage.getType());
for (int x = 0; x < width; x++) {
    for (int y = 0; y < height; y++) {
        targetImage.setRGB(y, (width - x - 1), srcImage.getRGB(x, y));
ImageIO.write(targetImage, "jpeg", target.toFile());
Point2D.FloatrotateCoor(float x, float y, float theta)
rotates a point theta radians, returns a new point rotation is counterclockwise for positive theta in Cartesian system, clockwise in screen display coordinate system 
double sintheta = Math.sin(theta);
double costheta = Math.cos(theta);
return new Point2D.Float((float) (x * costheta - y * sintheta), (float) (x * sintheta + y * costheta));
Point2D.FloatrotateCoorAroundPoint(float x, float y, float xctr, float yctr, float theta)
rotates a point theta radians around a point (xctr, yctr), returns a new point rotation is counterclockwise for positive theta in Cartesian system, clockwise in screen display coordinate system 
double sintheta = Math.sin(theta);
double costheta = Math.cos(theta);
Point2D.Float pt = translateCoor(x, y, -xctr, -yctr);
pt.setLocation((pt.x * costheta - pt.y * sintheta), (pt.x * sintheta + pt.y * costheta));
return translateCoor(pt, xctr, yctr);
ColorrotateHue(Color color, float fraction)
rotate Hue 
float af[] = Color.RGBtoHSB(color.getRed(), color.getGreen(), color.getBlue(), null);
float hue = af[0];
float saturation = af[1];
float brightness = af[2];
float hueNew = hue + fraction;
if (hueNew > 1) {
    hueNew = hueNew - 1;
return Color.getHSBColor(hueNew, saturation, brightness);
ColorrotateHue(Color color, float fraction)
Rotate a color through HSB space 
float af[] = Color.RGBtoHSB(color.getRed(), color.getGreen(), color.getBlue(), null);
float hue = af[0];
float saturation = af[1];
float brightness = af[2];
float hueNew = hue + fraction;
Color hsb = Color.getHSBColor(hueNew, saturation, brightness);
return new Color(hsb.getRed(), hsb.getGreen(), hsb.getBlue(), color.getAlpha());
PointrotateMoveClockwise(Point move, int size)
rotate Move Clockwise 
return new Point(size - 1 - move.y, move.x);
Point2D.DoublerotatePoint(double x0, double y0, double x, double y, double a)
Turn of a point round other point counter-clockwise 
Point2D.Double p = new Point2D.Double();
double sina = Math.sin(a);
double cosa = Math.cos(a);
p.x = x0 + (x - x0) * cosa + (y0 - y) * sina;
p.y = y0 + (x - x0) * sina + (y - y0) * cosa;
return p;