/**
* Renders a label for the given rectangle. The label is fitted into the rectangle if possible.
*
* @param event the paint event to work with on
* @param text the text to render
* @param color the color to use
* @param bounds the rectangle bounds
*/
protected void render(
final PaintEvent event, final String text, final RGB color, final IRectangle<N> bounds) {
if (text != null) {
// quite strange to create a new font object all the time?
// it did not work when I tried to reuse a long-living font object!
final Font font = new Font(event.display, fontName, 16, SWT.BOLD);
try {
event.gc.setFont(font);
final Color c = new Color(event.display, color);
try {
event.gc.setForeground(c);
} finally {
c.dispose();
}
final Point p = event.gc.textExtent(text);
p.x = p.x * 12 / 10; // make some space
final float scale =
(float) Math.min(bounds.getWidth() / (double) p.x, bounds.getHeight() / (double) p.y);
final Transform transform = new Transform(event.display);
try {
transform.translate(
(int) (bounds.getX() + bounds.getWidth() / 12d),
bounds.getY() + (bounds.getHeight() - scale * p.y) / 2);
transform.scale(scale, scale);
event.gc.setTransform(transform);
event.gc.drawString(text, 0, 0, true);
} finally {
transform.dispose();
}
} finally {
font.dispose();
}
}
}
/**
* Applies a scale transform.
*
* @param scaleX the scale factor along the x-axis.
* @param scaleY the scale factor along the y-axis.
*/
@Override
public void scale(double scaleX, double scaleY) {
Transform swtTransform = new Transform(this.gc.getDevice());
this.gc.getTransform(swtTransform);
swtTransform.scale((float) scaleX, (float) scaleY);
this.gc.setTransform(swtTransform);
swtTransform.dispose();
}
