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| import javax.vecmath.Point2d;
import javax.vecmath.Vector2d;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseMoveListener;
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.Point;
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 {
private final static double AXE_MAX = 1000;
private final static int SECTOR_NB = 8;
private final static double DX = 100;
private final static double DY = 60;
private final static int NX = 50;
private final static int NY = 60;
private static float angle = 0;
private static boolean isDrag = false;
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();
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() {
@Override
public void paintControl(PaintEvent e) {
GC gc = e.gc;
gc.setAdvanced(true);
int width = canvas.getSize().x;
int height = canvas.getSize().y;
Point center = new Point(width / 2, height / 2);
double maxGrid = Math.max(NX * DX, NY * DY);
double max = Math.max(maxGrid / 2.0, AXE_MAX);
int unit = Math.min(width, height);
double ratio = unit / 2.0 / max;
double valueMax = ratio * AXE_MAX;
double valueMin = valueMax * 0.5;
Transform transform = new Transform(display);
transform.translate(center.x, center.y);
transform.rotate(angle);
gc.setTransform(transform);
// the sector lines
gc.drawLine(0, 0, 0, (int) (-valueMax));
gc.setForeground(display.getSystemColor(SWT.COLOR_DARK_GRAY));
double stepSector = 2.0 * Math.PI / (1.0 * SECTOR_NB);
for (int i = 1; i < SECTOR_NB; i++) {
int xEnd = (int) (Math.cos(Math.PI / 2 - i * stepSector) * valueMin);
int yEnd = (int) (Math.sin(Math.PI / 2 - i * stepSector) * valueMax);
gc.drawLine(0, 0, xEnd, -yEnd);
}
// the ellipse
gc.drawOval((int) -valueMin, (int) -valueMax, (int) (2 * valueMin), (int) (2 * valueMax));
// image
gc.drawImage(image, 30, 30);
transform.dispose();
}
});
canvas.addMouseListener(new MouseAdapter() {
@Override
public void mouseDown(MouseEvent e) {
isDrag = (e.button == 1);
}
@Override
public void mouseUp(MouseEvent e) {
isDrag = false;
}
});
canvas.addMouseMoveListener(new MouseMoveListener() {
@Override
public void mouseMove(MouseEvent e) {
if (isDrag) {
int width = canvas.getSize().x;
int height = canvas.getSize().y;
Point2d center = new Point2d(width / 2., height / 2.);
Vector2d vectOld = new Vector2d(1, 0);
Vector2d vectNew = new Vector2d(e.x - center.x, center.y - e.y);
if (vectNew.y < 0) {
angle = (float) (180. * vectOld.angle(vectNew) / Math.PI);
} else {
angle = (float) (360 - 180. * vectOld.angle(vectNew) / Math.PI);
}
canvas.redraw();
}
}
});
shell.setSize(350, 550);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
image.dispose();
display.dispose();
}
} |
