Example usage for org.eclipse.swt.widgets Canvas Canvas

List of usage examples for org.eclipse.swt.widgets Canvas Canvas

  1. HOME
  2. Java
  3. org.eclipse.swt
  4. org.eclipse.swt.widgets.*
  5. Canvas
  6. Canvas

Introduction

In this page you can find the example usage for org.eclipse.swt.widgets Canvas Canvas.

Prototype

public Canvas(Composite parent, int style)

Source Link

Document

Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.

Usage

From source file:GroupImageAdding.java

public static void main(String[] args) {
    final Display display = new Display();

    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    Group group = new Group(shell, SWT.NONE);
    group.setLayout(new FillLayout());
    group.setText("a square");
    Canvas canvas = new Canvas(group, SWT.NONE);
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            e.gc.drawImage(new Image(display, "yourFile.gif"), 0, 0);
        }//  w  w  w .jav  a2  s  .com
    });

    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }

    display.dispose();
}

From source file:FontMetricsPaintSWT.java

public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Canvas Example");
    shell.setLayout(new FillLayout());

    Canvas canvas = new Canvas(shell, SWT.NONE);

    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {

            Font font = new Font(shell.getDisplay(), new FontData("Helvetica", 18, SWT.NORMAL));
            e.gc.setFont(font);/*from   w w w  .  j  a  va 2s.  c  om*/
            e.gc.drawText("My Text", 0, 0);

            FontMetrics fm = e.gc.getFontMetrics();
            int bHeight = fm.getLeading() + fm.getAscent();
            int oHeight = fm.getAscent();
            int yHeight = fm.getAscent() + fm.getDescent();
            int totalHeight = fm.getHeight(); // Equals fm.getLeading() + fm.getAscent()
                                              // + fm.getDescent();

            e.gc.drawLine(10, bHeight, 100, bHeight);
            e.gc.drawLine(10, oHeight, 100, oHeight);
            e.gc.drawLine(10, yHeight, 100, yHeight);
            e.gc.drawLine(10, totalHeight, 100, totalHeight);

            font.dispose();

        }
    });

    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }
    display.dispose();
}

From source file:ImagePartDraw.java

public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Canvas Example");
    shell.setLayout(new FillLayout());

    Canvas canvas = new Canvas(shell, SWT.NONE);

    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            Image image = new Image(display, "yourFile.gif");
            System.out.println(image.getImageData().scanlinePad);
            image.getImageData().scanlinePad = 40;
            System.out.println(image.getImageData().scanlinePad);

            e.gc.drawImage(image, 0, 0);
            // Determine how big the drawing area is
            Rectangle rect = shell.getClientArea();

            // Get information about the image
            ImageData data = image.getImageData();

            // Calculate drawing values
            int srcX = data.width / 4;
            int srcY = data.height / 4;
            int srcWidth = data.width / 2;
            int srcHeight = data.height / 2;
            int destWidth = 2 * srcWidth;
            int destHeight = 2 * srcHeight;

            // Draw the image
            e.gc.drawImage(image, srcX, srcY, srcWidth, srcHeight, rect.width - destWidth,
                    rect.height - destHeight, destWidth, destHeight);
        }/*from   w  w  w  . j av  a2  s.c  o m*/
    });

    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }
    display.dispose();
}

From source file:FontSizeString.java

public static void main(String[] a) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Extents");

    final Canvas canvas = new Canvas(shell, SWT.NONE);

    shell.addControlListener(new ControlAdapter() {
        public void controlResized(ControlEvent event) {
            canvas.setBounds(shell.getClientArea());
        }/*w  w w.j  a  v  a  2 s.c  om*/
    });
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent event) {
            event.gc.setFont(font);
            Point pt = event.gc.stringExtent(STRING);

            System.out.println(pt);
        }
    });

    // Create an editor to house the dropdown
    ControlEditor editor = new ControlEditor(canvas);

    // Create the combo and fill it
    final Combo combo = new Combo(canvas, SWT.READ_ONLY);
    for (int i = 0, n = SIZES.length; i < n; i++) {
        combo.add(SIZES[i]);
    }

    // Set up the editor
    editor.horizontalAlignment = SWT.CENTER;
    editor.verticalAlignment = SWT.TOP;
    Point size = combo.computeSize(SWT.DEFAULT, SWT.DEFAULT);
    editor.minimumWidth = size.x;
    editor.minimumHeight = size.y;
    editor.setEditor(combo);

    combo.addSelectionListener(new SelectionAdapter() {
        public void widgetSelected(SelectionEvent event) {
            if (font != null)
                font.dispose();
            font = new Font(shell.getDisplay(), "Helvetica", new Integer(combo.getText()).intValue(), SWT.BOLD);
            canvas.redraw();
        }
    });

    // Select the first item in the combo
    combo.select(0);

    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }
    if (font != null)
        font.dispose();
    display.dispose();
}

From source file:org.eclipse.swt.snippets.Snippet242.java

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Snippet 242");
    shell.setBounds(10, 10, 200, 200);//from   w w  w .j a va2s. com
    Canvas canvas = new Canvas(shell, SWT.BORDER);
    canvas.setBounds(10, 50, 150, 100);
    canvas.addPaintListener(e -> e.gc.drawString("hide Cursor here", 10, 10));

    // create a cursor with a transparent image
    Color white = display.getSystemColor(SWT.COLOR_WHITE);
    Color black = display.getSystemColor(SWT.COLOR_BLACK);
    PaletteData palette = new PaletteData(white.getRGB(), black.getRGB());
    ImageData sourceData = new ImageData(16, 16, 1, palette);
    sourceData.transparentPixel = 0;
    Cursor cursor = new Cursor(display, sourceData, 0, 0);

    shell.open();
    canvas.setCursor(cursor);
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    cursor.dispose();
    display.dispose();
}

From source file:Snippet21.java

public static void main(String[] args) {
    Display display = new Display();
    final Color red = display.getSystemColor(SWT.COLOR_RED);
    final Color blue = display.getSystemColor(SWT.COLOR_BLUE);
    Shell shell = new Shell(display);
    Button b = new Button(shell, SWT.PUSH);
    b.setBounds(10, 10, 100, 32);/* w ww. j a  v  a2s  .com*/
    b.setText("Button");
    shell.setDefaultButton(b);
    final Canvas c = new Canvas(shell, SWT.BORDER);
    c.setBounds(10, 50, 100, 32);
    c.addListener(SWT.Traverse, new Listener() {
        public void handleEvent(Event e) {
            switch (e.detail) {
            /* Do tab group traversal */
            case SWT.TRAVERSE_ESCAPE:
            case SWT.TRAVERSE_RETURN:
            case SWT.TRAVERSE_TAB_NEXT:
            case SWT.TRAVERSE_TAB_PREVIOUS:
            case SWT.TRAVERSE_PAGE_NEXT:
            case SWT.TRAVERSE_PAGE_PREVIOUS:
                e.doit = true;
                break;
            }
        }
    });
    c.addListener(SWT.FocusIn, new Listener() {
        public void handleEvent(Event e) {
            c.setBackground(red);
        }
    });
    c.addListener(SWT.FocusOut, new Listener() {
        public void handleEvent(Event e) {
            c.setBackground(blue);
        }
    });
    c.addListener(SWT.KeyDown, new Listener() {
        public void handleEvent(Event e) {
            System.out.println("KEY");
            for (int i = 0; i < 64; i++) {
                Color c1 = red, c2 = blue;
                if (c.isFocusControl()) {
                    c1 = blue;
                    c2 = red;
                }
                c.setBackground(c1);
                c.update();
                c.setBackground(c2);
            }
        }
    });
    Text t = new Text(shell, SWT.SINGLE | SWT.BORDER);
    t.setBounds(10, 85, 100, 32);

    Text r = new Text(shell, SWT.MULTI | SWT.BORDER);
    r.setBounds(10, 120, 100, 32);

    c.setFocus();
    shell.setSize(200, 200);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

From source file:org.eclipse.swt.snippets.Snippet286.java

public static void main(java.lang.String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Snippet 286");
    shell.setLayout(new GridLayout());

    Canvas blankCanvas = new Canvas(shell, SWT.BORDER);
    blankCanvas.setLayoutData(new GridData(200, 200));
    final Label statusLine = new Label(shell, SWT.NONE);
    statusLine.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));

    Menu bar = new Menu(shell, SWT.BAR);
    shell.setMenuBar(bar);//w  ww  .jav  a  2  s  .com

    MenuItem menuItem = new MenuItem(bar, SWT.CASCADE);
    menuItem.setText("Test");
    Menu menu = new Menu(bar);
    menuItem.setMenu(menu);

    for (int i = 0; i < 5; i++) {
        MenuItem item = new MenuItem(menu, SWT.PUSH);
        item.setText("Item " + i);
        item.addArmListener(e -> statusLine.setText(((MenuItem) e.getSource()).getText()));
    }

    shell.pack();
    shell.open();

    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

From source file:Snippet112.java

public static void main(String[] args) {
    Display display = new Display();
    final Image image = new Image(display, 20, 20);
    Color color = display.getSystemColor(SWT.COLOR_RED);
    GC gc = new GC(image);
    gc.setBackground(color);/*from www.j a va2 s  . c  o  m*/
    gc.fillRectangle(image.getBounds());
    gc.dispose();
    color.dispose();

    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    Group group = new Group(shell, SWT.NONE);
    group.setLayout(new FillLayout());
    group.setText("a square");
    Canvas canvas = new Canvas(group, SWT.NONE);
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            e.gc.drawImage(image, 0, 0);
        }
    });

    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    image.dispose();
    display.dispose();
}

From source file:SheerXYDirection.java

public static void main(String[] args) {
    final Display display = new Display();

    final Image image = new Image(display, 110, 60);
    GC gc = new GC(image);
    Font font = new Font(display, "Times", 30, SWT.BOLD);
    gc.setFont(font);/*from   www .j ava  2 s  . c  o  m*/
    gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
    gc.fillRectangle(0, 0, 110, 60);
    gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
    gc.drawText("SWT", 10, 10, true);
    font.dispose();
    gc.dispose();

    final Rectangle rect = image.getBounds();
    Shell shell = new Shell(display);
    shell.setText("Matrix Tranformations");
    shell.setLayout(new FillLayout());

    final Canvas canvas = new Canvas(shell, SWT.DOUBLE_BUFFERED);
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            GC gc = e.gc;
            gc.setAdvanced(true);
            if (!gc.getAdvanced()) {
                gc.drawText("Advanced graphics not supported", 30, 30, true);
                return;
            }

            // Original image
            int x = 30, y = 30;
            gc.drawImage(image, x, y);
            x += rect.width + 30;

            Transform transform = new Transform(display);

            // Shear in the x-direction
            transform.setElements(1, 0, -1, 1, 0, 0);
            gc.setTransform(transform);
            gc.drawImage(image, 300, y);

            // Shear in y-direction
            transform.setElements(1, -1, 0, 1, 0, 0);
            gc.setTransform(transform);
            gc.drawImage(image, 150, 475);

            transform.dispose();
        }
    });

    shell.setSize(350, 550);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    image.dispose();
    display.dispose();
}

From source file:Rotate45Degrees.java

public static void main(String[] args) {
    final Display display = new Display();

    final Image image = new Image(display, 110, 60);
    GC gc = new GC(image);
    Font font = new Font(display, "Times", 30, SWT.BOLD);
    gc.setFont(font);/*ww w.  j a v a2s .  co  m*/
    gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
    gc.fillRectangle(0, 0, 110, 60);
    gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
    gc.drawText("SWT", 10, 10, true);
    font.dispose();
    gc.dispose();

    final Rectangle rect = image.getBounds();
    Shell shell = new Shell(display);
    shell.setText("Matrix Tranformations");
    shell.setLayout(new FillLayout());

    final Canvas canvas = new Canvas(shell, SWT.DOUBLE_BUFFERED);
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            GC gc = e.gc;
            gc.setAdvanced(true);
            if (!gc.getAdvanced()) {
                gc.drawText("Advanced graphics not supported", 30, 30, true);
                return;
            }

            // Original image
            int x = 30, y = 30;
            gc.drawImage(image, x, y);
            x += rect.width + 30;

            Transform transform = new Transform(display);

            // Rotate by 45 degrees 
            //float cos45 = (float)Math.cos(45);
            float cos45 = (float) Math.cos(Math.PI / 4);

            //float sin45 = (float)Math.sin(45);
            float sin45 = (float) Math.sin(Math.PI / 4);

            transform.setElements(cos45, sin45, -sin45, cos45, 0, 0);
            gc.setTransform(transform);
            gc.drawImage(image, 350, 100);

            transform.dispose();
        }
    });

    shell.setSize(350, 550);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    image.dispose();
    display.dispose();
}