/** Initialize the canvas in the appropriate part of the window */
public void initCanvas() {
canvas = new Canvas(shell, SWT.NO_BACKGROUND | SWT.BORDER);
GridData gridData = new GridData();
gridData.horizontalAlignment = GridData.FILL;
gridData.verticalAlignment = GridData.FILL;
gridData.grabExcessHorizontalSpace = true;
gridData.grabExcessVerticalSpace = true;
canvas.setLayoutData(gridData);
}
public static void main(String[] args) {
final ImageFileNameProvider filenameProvider =
new ImageFileNameProvider() {
@Override
public String getImagePath(int zoom) {
switch (zoom) {
case 150:
return IMAGE_PATH_150;
case 200:
return IMAGE_PATH_200;
default:
return IMAGE_PATH_100;
}
}
};
final ImageDataProvider imageDataProvider =
new ImageDataProvider() {
@Override
public ImageData getImageData(int zoom) {
switch (zoom) {
case 150:
return new ImageData(IMAGE_PATH_150);
case 200:
return new ImageData(IMAGE_PATH_200);
default:
return new ImageData(IMAGE_PATH_100);
}
}
};
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new GridLayout(2, false));
new Label(shell, SWT.NONE).setText(IMAGE_200 + ":");
new Label(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_200));
new Label(shell, SWT.NONE).setText(IMAGE_150 + ":");
new Label(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_150));
new Label(shell, SWT.NONE).setText(IMAGE_100 + ":");
new Label(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_100));
new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
new Label(shell, SWT.NONE).setText("ImageFileNameProvider:");
new Label(shell, SWT.NONE).setImage(new Image(display, filenameProvider));
new Label(shell, SWT.NONE).setText("ImageDataProvider:");
new Label(shell, SWT.NONE).setImage(new Image(display, imageDataProvider));
new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
new Label(shell, SWT.NONE).setText("Canvas\n(PaintListener)");
final Point size = new Point(550, 35);
final Canvas canvas = new Canvas(shell, SWT.NONE);
canvas.addPaintListener(
new PaintListener() {
@Override
public void paintControl(PaintEvent e) {
Point size = canvas.getSize();
paintImage(e.gc, size);
}
});
canvas.setLayoutData(new GridData(size.x, size.y));
new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
new Label(shell, SWT.NONE).setText("Painted image\n (default resolution)");
Image image = new Image(display, size.x, size.y);
GC gc = new GC(image);
try {
paintImage(gc, size);
} finally {
gc.dispose();
}
new Label(shell, SWT.NONE).setImage(image);
new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
new Label(shell, SWT.NONE).setText("Painted image\n(multi-res, unzoomed paint)");
new Label(shell, SWT.NONE)
.setImage(
new Image(
display,
new ImageDataProvider() {
@Override
public ImageData getImageData(int zoom) {
Image temp = new Image(display, size.x * zoom / 100, size.y * zoom / 100);
GC gc = new GC(temp);
try {
paintImage(gc, size);
return temp.getImageData();
} finally {
gc.dispose();
temp.dispose();
}
}
}));
new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
new Label(shell, SWT.NONE).setText("Painted image\n(multi-res, zoomed paint)");
new Label(shell, SWT.NONE)
.setImage(
new Image(
display,
new ImageDataProvider() {
@Override
public ImageData getImageData(int zoom) {
Image temp = new Image(display, size.x * zoom / 100, size.y * zoom / 100);
GC gc = new GC(temp);
try {
paintImage2(
gc, new Point(size.x * zoom / 100, size.y * zoom / 100), zoom / 100);
return temp.getImageData();
} finally {
gc.dispose();
temp.dispose();
}
}
}));
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}