Пример #1
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 /**
  * Set the canvas visibility and brings canvas to the front of screen when made visible. This
  * method can also be used to bring an already visible canvas to the front of other windows.
  *
  * @param visible boolean value representing the desired visibility of the canvas (true or false)
  */
 public void setVisible(boolean visible) {
   if (graphic == null) {
     // first time: instantiate the offscreen image and fill it with
     // the background color
     Dimension size = canvas.getSize();
     canvasImage = canvas.createImage(size.width, size.height);
     graphic = (Graphics2D) canvasImage.getGraphics();
     graphic.setColor(backgroundColor);
     graphic.fillRect(0, 0, size.width, size.height);
     graphic.setColor(Color.black);
   }
   frame.setVisible(visible);
 }
Пример #2
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 /** Erase the whole canvas. (Does not repaint.) */
 private void erase() {
   Color original = graphic.getColor();
   graphic.setColor(backgroundColor);
   Dimension size = canvas.getSize();
   graphic.fill(new Rectangle(0, 0, size.width, size.height));
   graphic.setColor(original);
 }
Пример #3
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 /**
  * Erases a String on the Canvas.
  *
  * @param text the String to be displayed
  * @param x x co-ordinate for text placement
  * @param y y co-ordinate for text placement
  */
 public void eraseString(String text, int x, int y) {
   Color original = graphic.getColor();
   graphic.setColor(backgroundColour);
   graphic.drawString(text, x, y);
   graphic.setColor(original);
   canvas.repaint();
 }
Пример #4
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 /** Redraw ell shapes currently on the Canvas. */
 private void redraw() {
   erase();
   for (Object shape : objects) {
     shapes.get(shape).draw(graphic);
   }
   canvas.repaint();
 }
Пример #5
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 /**
  * Erases a given shape's outline on the screen.
  *
  * @param shape the shape object to be erased
  */
 public void eraseOutline(Shape shape) {
   Color original = graphic.getColor();
   graphic.setColor(backgroundColour);
   graphic.draw(shape); // erase by drawing background colour
   graphic.setColor(original);
   canvas.repaint();
 }
Пример #6
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 /** Redraw ell shapes currently on the Canvas. */
 private void redraw() {
   erase();
   for (Iterator i = objects.iterator(); i.hasNext(); ) {
     shapes.get(i.next()).draw(graphic);
   }
   canvas.repaint();
 }
Пример #7
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 /**
  * Create a Canvas.
  *
  * @param title title to appear in Canvas Frame
  * @param width the desired width for the canvas
  * @param height the desired height for the canvas
  * @param bgClour the desired background colour of the canvas
  */
 private Canvas(String title, int width, int height, Color bgColour) {
   frame = new JFrame();
   canvas = new CanvasPane();
   frame.setContentPane(canvas);
   frame.setTitle(title);
   canvas.setPreferredSize(new Dimension(width, height));
   backgroundColour = bgColour;
   frame.pack();
 }
Пример #8
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 /**
  * Create a Canvas.
  *
  * @param title title to appear in Canvas Frame
  * @param width the desired width for the canvas
  * @param height the desired height for the canvas
  * @param bgClour the desired background colour of the canvas
  */
 private Canvas(String title, int width, int height, Color bgColour) {
   frame = new JFrame();
   canvas = new CanvasPane();
   frame.setContentPane(canvas);
   frame.setTitle(title);
   canvas.setPreferredSize(new Dimension(width, height));
   backgroundColour = bgColour;
   frame.pack();
   objects = new ArrayList<Object>();
   shapes = new HashMap<Object, ShapeDescription>();
 }
Пример #9
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 /**
  * Fills the internal dimensions of a given shape with the current foreground colour of the
  * canvas.
  *
  * @param shape the shape object to be filled
  */
 public void fill(Shape shape) {
   graphic.fill(shape);
   canvas.repaint();
 }
Пример #10
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 /**
  * Draws a given shape onto the canvas.
  *
  * @param shape the shape object to be drawn on the canvas
  */
 public void draw(Shape shape) {
   graphic.draw(shape);
   canvas.repaint();
 }
Пример #11
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 /**
  * Returns the size of the canvas.
  *
  * @return The current dimension of the canvas
  */
 public Dimension getSize() {
   return canvas.getSize();
 }
Пример #12
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 /**
  * Sets the size of the canvas.
  *
  * @param width new width
  * @param height new height
  */
 public void setSize(int width, int height) {
   canvas.setPreferredSize(new Dimension(width, height));
   frame.pack();
 }
Пример #13
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 /**
  * Draws a line on the Canvas.
  *
  * @param x1 x co-ordinate of start of line
  * @param y1 y co-ordinate of start of line
  * @param x2 x co-ordinate of end of line
  * @param y2 y co-ordinate of end of line
  */
 public void drawLine(int x1, int y1, int x2, int y2) {
   graphic.drawLine(x1, y1, x2, y2);
   canvas.repaint();
 }
Пример #14
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 /**
  * Draws a String on the Canvas.
  *
  * @param text the String to be displayed
  * @param x x co-ordinate for text placement
  * @param y y co-ordinate for text placement
  */
 public void drawString(String text, int x, int y) {
   graphic.drawString(text, x, y);
   canvas.repaint();
 }
Пример #15
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 /**
  * Draws an image onto the canvas.
  *
  * @param image the Image object to be displayed
  * @param x x co-ordinate for Image placement
  * @param y y co-ordinate for Image placement
  * @return returns boolean value representing whether the image was completely loaded
  */
 public boolean drawImage(Image image, int x, int y) {
   boolean result = graphic.drawImage(image, x, y, null);
   canvas.repaint();
   return result;
 }