?? sketchview.java
字號:
import javax.swing.*;
import java.util.*; // For Observer
import java.awt.*; // For Graphics
import java.awt.geom.*;
class SketchView extends JComponent
implements Observer
{
public void paint(Graphics g)
{
// Temporary code
Graphics2D g2D = (Graphics2D)g; // Get a Java 2D device context
Point2D.Double position = new Point2D.Double(50,10); // Initial position
double width = 150; // Width of ellipse
double height = 100; // Height of ellipse
double start = 30; // Start angle for arc
double extent = 120; // Extent of arc
double diameter = 40; // Diameter of circle
// Define open arc as an upper segment of an ellipse
Arc2D.Double top = new Arc2D.Double(position.x, position.y,
width, height,
start, extent,
Arc2D.OPEN);
// Define open arc as lower segment of ellipse shifted up relative to 1st
Arc2D.Double bottom = new Arc2D.Double(
position.x, position.y - height + diameter,
width, height,
start + 180, extent,
Arc2D.OPEN);
// Create a circle centered between the two arcs
Ellipse2D.Double circle1 = new Ellipse2D.Double(
position.x + width/2 - diameter/2,position.y,
diameter, diameter);
// Create a second circle concentric with the first and half the diameter
Ellipse2D.Double circle2 = new Ellipse2D.Double(
position.x + width/2 - diameter/4, position.y + diameter/4,
diameter/2, diameter/2);
// Draw all the shapes
g2D.setPaint(Color.black); // Draw in black
g2D.draw(top);
g2D.draw(bottom);
g2D.setPaint(Color.blue); // Draw in blue
g2D.draw(circle1);
g2D.draw(circle2);
g2D.drawString("Arcs and ellipses", 80, 100); // Draw some text
}
public SketchView(Sketcher theApp)
{
this.theApp = theApp;
}
// Method called by Observable object when it changes
public void update(Observable o, Object rectangle)
{
// Code to respond to changes in the model...
}
private Sketcher theApp; // The application object
}
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