Mega Code Archive
Demonstrates drawing polygons
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//Send questions, comments, bug reports, etc. to the authors:
//Rob Warner (rwarner@interspatial.com)
//Robert Harris (rbrt_harris@yahoo.com)
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
/**
* This class demonstrates drawing polygons
*/
public class PolygonExample {
private Text txtWidth = null;
private Text txtHeight = null;
/**
* Runs the application
*/
public void run() {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Polygon Example");
createContents(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
/**
* Creates the main window's contents
*
* @param shell the main window
*/
private void createContents(Shell shell) {
shell.setLayout(new FillLayout(SWT.VERTICAL));
// Create the canvas to draw the polygons on
Canvas drawingCanvas = new Canvas(shell, SWT.NONE);
drawingCanvas.addPaintListener(new PolygonExamplePaintListener());
}
/**
* This class gets the user input and draws the requested oval
*/
private class PolygonExamplePaintListener implements PaintListener {
public void paintControl(PaintEvent e) {
// Get the canvas for drawing and its dimensions
Canvas canvas = (Canvas) e.widget;
int x = canvas.getBounds().width;
int y = canvas.getBounds().height;
// Set the drawing color
e.gc.setBackground(e.display.getSystemColor(SWT.COLOR_BLACK));
// Create the points for drawing a triangle in the upper left
int[] upper_left = { 0, 0, 200, 0, 0, 200};
// Create the points for drawing a triangle in the lower right
int[] lower_right = { x, y, x, y - 200, x - 200, y};
// Draw the triangles
e.gc.fillPolygon(upper_left);
e.gc.fillPolygon(lower_right);
}
}
/**
* The application entry point
*
* @param args the command line arguments
*/
public static void main(String[] args) {
new PolygonExample().run();
}
}
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