Mega Code Archive
Demonstrates drawing lines
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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.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.layout.*;
/**
* This class demonstrates drawing lines
*/
public class LineExample {
/**
* Runs the application
*/
public void run() {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Line 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());
// Create a canvas to draw on
Canvas canvas = new Canvas(shell, SWT.NONE);
// Add a handler to do the drawing
canvas.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
// Get the canvas and its size
Canvas canvas = (Canvas) e.widget;
int maxX = canvas.getSize().x;
int maxY = canvas.getSize().y;
// Calculate the middle
int halfX = (int) maxX / 2;
int halfY = (int) maxY / 2;
// Set the drawing color to blue
e.gc.setForeground(e.display.getSystemColor(SWT.COLOR_BLUE));
// Set the width of the lines to draw
e.gc.setLineWidth(10);
// Draw a vertical line halfway across the canvas
e.gc.drawLine(halfX, 0, halfX, maxY);
// Draw a horizontal line halfway down the canvas
e.gc.drawLine(0, halfY, maxX, halfY);
}
});
}
/**
* The application entry point
*
* @param args the command line arguments
*/
public static void main(String[] args) {
new LineExample().run();
}
}
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