/**
* 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;
}
static Icon reescala(Icon ic, int maxW, int maxH) {
if (ic == null) {
return null;
}
if (ic.getIconHeight() == maxH && ic.getIconWidth() == maxW) {
return ic;
}
BufferedImage bi =
new BufferedImage(ic.getIconHeight(), ic.getIconWidth(), BufferedImage.TYPE_INT_ARGB);
Graphics g = bi.createGraphics();
ic.paintIcon(null, g, 0, 0);
g.dispose();
Image bf = bi.getScaledInstance(maxW, maxH, Image.SCALE_SMOOTH);
return new ImageIcon(bf);
}