/**
* This is a stripped-down version of the Canvas class from the
* BlueJ team, retaining only the most fundamental features.
*
* @author BlueJ team with modifications by Gordon Royle
* @version July 2003
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class SimpleCanvas
{
private JFrame frame;
private CanvasPane canvas;
private Graphics2D graphic;
private Image canvasImage;
private boolean autoRepaint;
/**
* Creates and displays a SimpleCanvas of the specified size
* with a white background. The client specifies whether repainting
* after a drawing command should be manual or automatic.
*
* @param title title for the window
* @param width the desired width of the SimpleCanvas
* @param height the desired height of the SimpleCanvas
* @param autoRepaint true for automatic repainting
*
*/
public SimpleCanvas(String title, int width, int height, boolean autoRepaint) {
frame = new JFrame();
canvas = new CanvasPane();
frame.setContentPane(canvas);
frame.setTitle(title);
canvas.setPreferredSize(new Dimension(width,height));
frame.pack();
Dimension size = canvas.getSize();
canvasImage = canvas.createImage(size.width,size.height);
graphic = (Graphics2D) canvasImage.getGraphics();
graphic.setColor(Color.white);
graphic.fillRect(0,0,size.width,size.height);
graphic.setColor(Color.black);
frame.setVisible(true);
frame.setVisible(true);
// frame.show();
frame.setVisible(true);
this.autoRepaint = autoRepaint;
}
/**
* Creates and displays a SimpleCanvas with a white background and
* with automatic repainting after drawing commands.
*
* @param title title for the window
* @param width the desired width of the SimpleCanvas
* @param height the desired height of the SimpleCanvas
*
*/
public SimpleCanvas(String title, int width, int height) {
this(title,width,height,true);
}
/**
* Creates and displays a SimpleCanvas of size 400x400 with the
* default title "SimpleCanvas" and with automatic repainting
* enabled.
*
* @param title title for the window
* @param width the desired width of the SimpleCanvas
* @param height the desired height of the SimpleCanvas
*
*/
public SimpleCanvas() {
this("SimpleCanvas",400,400);
}
/**
* Draws a line on the SimpleCanvas between two points.
*
* @param x1 x-coordinate of the first point
* @param y1 y-coordinate of the first point
* @param x2 x-coordinate of the second point
* @param y2 y-coordinate of the second point
*
*/
public void drawLine(int x1, int y1, int x2, int y2) {
graphic.drawLine(x1,y1,x2,y2);
if (autoRepaint) canvas.repaint();
}
/**
* Changes the colour for subsequent
* drawing on this SimpleCanvas.
*
* @param newColour the new drawing colour
*
*/
public void setForegroundColour(Color newColour) {
graphic.setColor(newColour);
}
/**
* Gets the colour currently used for
* drawing on this SimpleCanvas.
*
*/
public Color getForegroundColour() {
return graphic.getColor();
}
/**
* Changes the font for subsequent String
* drawing on this SimpleCanvas.
*
* @param newFont the new Font
*
*/
public void setFont(Font newFont) {
graphic.setFont(newFont);
}
/**
* Gets the font currently used for
* String drawing on this Canvas
*/
public Font getFont() {
return graphic.getFont();
}
/**
* Draws the specified String at the specified
* location on this SimpleCanvas
*/
public void drawString(String text, int x, int y) {
graphic.drawString(text, x, y);
if (autoRepaint) canvas.repaint();
}
/**
* Sets the repaint mode to either manual or automatic.
*
* @param autoRepaint automatic repainting if this is true
*
*/
public void setAutoRepaint(boolean autoRepaint) {
this.autoRepaint = autoRepaint;
}
/**
* If this SimpleCanvas does not automatically repaint
* after each drawing command, then this method can be
* used to cause a manual repaint.
*/
public void repaint() {
canvas.repaint();
}
/**
* Causes execution to pause for the specified amount of time.
* This is usually used to produce animations in an easy
* manner, by repeatedly drawing, pausing, and then redrawing
* an object.
*/
public void wait(int millis) {
try {
Thread.sleep(millis);
} catch (InterruptedException ie) {
System.out.println("Interrruption in SimpleCanvas: "+ie);
}
}
public void addMouseListener(MouseListener ml) {
canvas.addMouseListener(ml);
}
class CanvasPane extends JPanel {
public void paint(Graphics g) {
g.drawImage(canvasImage,0,0,null);
}
}
}
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Java error "Another <identifier> expected"
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Much thanks. I'll definately be back here if I can't work anything out.
