Hi Reinhard,
You need to seperate your image generating logic from the wicket Image
Resource.
I'd create a test program or unit test to build verify that the image
you want is being built correctly and then bind it into wicket.
For example you can just use a BufferedDynamicImageResource with the
image you generate.
Here is some code I have for writing a string into an image. If you
pass backgroundColor = null it will emit a transparent background with
foregroundColor text on top.
public static BufferedImage writeString(String text, int height, int
width, Font font, Color backgroundColor, Color foregroundColor) {
// TYPE_INT_ARGB specifies the image format: 8-bit RGBA packed
// into integer pixels
BufferedImage bi = new BufferedImage(width, height,
BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics2D = bi.createGraphics();
graphics2D.setFont(font);
FontMetrics fontMetrics = graphics2D.getFontMetrics();
int stringWidth = fontMetrics.stringWidth(text);
int stringHeight = fontMetrics.getAscent();
if (backgroundColor != null) {
graphics2D.setBackground(backgroundColor);
graphics2D.clearRect(0, 0, width, height);
}
graphics2D.setPaint(foregroundColor);
graphics2D.drawString(text, (width - stringWidth) / 2, height
/ 2 + stringHeight / 4);
return bi;
}
These Wiki references that should also help you:
http://cwiki.apache.org/WICKET/how-to-create-dynamic-image-overlays.html
http://cwiki.apache.org/WICKET/how-to-stamp-an-image-template-with-context-specific-details.html
Regards,
Mike
I like to have a RenderedDynamicImageResource with a transparent background.
I tried serveral things google came up with. But none worked so far.
Let me show you what I do:
public RenderedDynamicImageResource getCity(final Long cityId){
RenderedDynamicImageResource image = new
RenderedDynamicImageResource(500, 570) {
private static final long serialVersionUID = 1L;
@Override
protected boolean render(Graphics2D mapGraphic) {
return renderCity(mapGraphic, cityId);
}
};
return image;
}
protected boolean renderCity(Graphics2D mapGraphic, final Long cityId) {
....
// Prepare g2 for transparency
//one of the approches I tried... without luck
mapGraphic.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC,
0.9f));
Rectangle2D.Double rect = new Rectangle2D.Double(0, 0, 500,
570);
mapGraphic.fill(rect);
.....
// Here I draw some shapes into the mapGraphic
....
//in the end I'd like to have a png with a transparent background
and some shapes on it
}
If anyone can provide me with help or even a working example, that would be
greatly apreciated.
cheers
reinhard
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