import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.Transform;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class Rotate45Degrees {
public static void main(String[] args) {
final Display display = new Display();
final Image image = new Image(display, 110, 60);
GC gc = new GC(image);
Font font = new Font(display, "Times", 30, SWT.BOLD);
gc.setFont(font);
gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
gc.fillRectangle(0, 0, 110, 60);
gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
gc.drawText("SWT", 10, 10, true);
font.dispose();
gc.dispose();
final Rectangle rect = image.getBounds();
Shell shell = new Shell(display);
shell.setText("Matrix Tranformations");
shell.setLayout(new FillLayout());
final Canvas canvas = new Canvas(shell, SWT.DOUBLE_BUFFERED);
canvas.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
GC gc = e.gc;
gc.setAdvanced(true);
if (!gc.getAdvanced()) {
gc.drawText("Advanced graphics not supported", 30, 30, true);
return;
}
// Original image
int x = 30, y = 30;
gc.drawImage(image, x, y);
x += rect.width + 30;
Transform transform = new Transform(display);
// Rotate by 45 degrees
//float cos45 = (float)Math.cos(45);
float cos45 = (float)Math.cos(Math.PI/4);
//float sin45 = (float)Math.sin(45);
float sin45 = (float)Math.sin(Math.PI/4);
transform.setElements(cos45, sin45, -sin45, cos45, 0, 0);
gc.setTransform(transform);
gc.drawImage(image, 350, 100);
transform.dispose();
}
});
shell.setSize(350, 550);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
image.dispose();
display.dispose();
}
}