public void drawImage(Image img, float alpha, double[] _xyzSW, double[] _xyzSE, double[] _xyzNW) {
Composite cs = comp2D.getComposite();
comp2D.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha));
AffineTransform t =
getAffineTransform(img.getWidth(canvas), img.getHeight(canvas), _xyzSW, _xyzSE, _xyzNW);
if (t != null) {
comp2D.drawImage(img, t, canvas);
}
comp2D.setComposite(cs);
}
/**
* Prepare a buffer for the image, return if the canvas is ready Only need to call this when the
* size of the canvas is changed, Since we automatically detect the size change in paint() only
* call this on start
*/
public boolean newImgBuf() {
Dimension sz = getSize();
if (sz.width == 0 || sz.height == 0) return false;
// quit if the current image already has the right size
if (img != null && imgG != null && sz.equals(imgSize)) return true;
img = createImage(sz.width, sz.height);
if (imgG != null) imgG.dispose();
imgG = img.getGraphics();
imgSize = sz;
return true;
}