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Rotate.javaAPI DocApache Ant 1.704487Wed Dec 13 06:16:18 GMT 2006org.apache.tools.ant.types.optional.image

Rotate

public class Rotate extends TransformOperation implements DrawOperation
ImageOperation to rotate an image by a certain degree
see
org.apache.tools.ant.taskdefs.optional.image.Image

Fields Summary
private static final float
HALF_CIRCLE
protected float
angle
Constructors Summary
Methods Summary
public javax.media.jai.PlanarImageexecuteDrawOperation()
Performs the image rotation when being handled as a DrawOperation. It absolutely requires that there be a DrawOperation nested beneath it, but only the FIRST DrawOperation will be handled since it can only return ONE image.

return
the image.

        for (int i = 0; i < instructions.size(); i++) {
            ImageOperation instr = ((ImageOperation) instructions.elementAt(i));
            if (instr instanceof DrawOperation) {
                // If this TransformOperation has DrawOperation children
                // then Rotate the first child and return.
                PlanarImage op = ((DrawOperation) instr).executeDrawOperation();
                op = performRotate(op);
                return op;
            }
        }
        return null;
public javax.media.jai.PlanarImageexecuteTransformOperation(javax.media.jai.PlanarImage image)
Performs the image rotation when being handled as a TransformOperation.

param
image The image to perform the transformation on.
return
the transformed image.

        BufferedImage bi = null;
        Graphics2D graphics = null;
        for (int i = 0; i < instructions.size(); i++) {
            ImageOperation instr = ((ImageOperation) instructions.elementAt(i));
            if (instr instanceof DrawOperation) {
                // If this TransformOperation has DrawOperation children
                // then Rotate the first child and return.
                System.out.println("Execing Draws");
                PlanarImage op = ((DrawOperation) instr).executeDrawOperation();
                image = performRotate(op);
                return image;
            } else if (instr instanceof TransformOperation) {
                bi = image.getAsBufferedImage();
                graphics = (Graphics2D) bi.getGraphics();
                System.out.println("Execing Transforms");
                image = ((TransformOperation) instr)
                    .executeTransformOperation(PlanarImage.wrapRenderedImage(bi));
                bi = image.getAsBufferedImage();
            }
        }
        System.out.println("Execing as TransformOperation");
        image = performRotate(image);
        System.out.println(image);
        return image;
public javax.media.jai.PlanarImageperformRotate(javax.media.jai.PlanarImage image)
Rotate an image.

param
image the image to rotate.
return
the rotated image.

        float tAngle = (float) (angle * (Math.PI / HALF_CIRCLE));
        ParameterBlock pb = new ParameterBlock();
        pb.addSource(image);
        pb.add(0.0F);
        pb.add(0.0F);
        pb.add(tAngle);
        pb.add(new InterpolationNearest());
        return JAI.create("Rotate", pb, null);
public voidsetAngle(java.lang.String ang)
Sets the angle of rotation in degrees.

param
ang The angle at which to rotate the image

    // CheckStyle:VisibilityModifier ON

                          
        
        angle = Float.parseFloat(ang);