1、点击鼠标左键在shell里画线。
public static void main(String[] args)
{
Display display = new Display();
final Shell shell = new Shell(display);
Listener listener = new Listener() {
int lastX = 0, lastY = 0;
public void handleEvent(Event event)
{
switch (event.type)
{
case SWT.MouseMove :
if ((event.stateMask & SWT.BUTTON1) == 0)
break; // 判断是否为鼠标左键，如果不是跳出
GC gc = new GC(shell);
gc.drawLine(lastX, lastY, event.x, event.y);
gc.dispose();
// FALL THROUGH
case SWT.MouseDown :
lastX = event.x;
lastY = event.y;
break;
}
}
};
shell.addListener(SWT.MouseDown, listener);
shell.addListener(SWT.MouseMove, listener);
shell.open();
while (!shell.isDisposed())
{
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
2、在弹出窗口中显示表的当时图像状态。
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setText("Widget");
//建立一个简单的表
final Table table = new Table(shell, SWT.MULTI);
table.setLinesVisible(true);
table.setBounds(10, 10, 100, 100);
for (int i = 0; i < 9; i++) {
new TableItem(table, SWT.NONE).setText("item" + i);
}
//建立捕捉图像的按钮
Button button = new Button(shell, SWT.PUSH);
button.setText("Capture");
button.pack();
button.setLocation(10, 140);
button.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
Point tableSize = table.getSize(); //获取表的大小
GC gc = new GC(table); //建立表的GC对象
final Image image =
new Image(display, tableSize.x, tableSize.y); //建立表大小的图像image
gc.copyArea(image, 0, 0); //利用表的GC对象把表的图像复制到image中
gc.dispose();
//建立一个弹出面板Shell对象popup
Shell popup = new Shell(shell);
popup.setText("Image");
popup.addListener(SWT.Close, new Listener() {
public void handleEvent(Event e) {
image.dispose();
}
});
//在popup上建立画布对象canvas
Canvas canvas = new Canvas(popup, SWT.NONE);
canvas.setBounds(10, 10, tableSize.x+10, tableSize.y+10);
canvas.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
e.gc.drawImage(image, 0, 0); //在画布上绘出表的图像image
}
});
popup.pack();
popup.open();
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
3、获取整个窗口的图像并显示。
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
Button button = new Button(shell, SWT.PUSH);
button.setText("Capture");
button.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
/* Take the screen shot */
GC gc = new GC(display);
final Image image = new Image(display, display.getBounds());
gc.copyArea(image, 0, 0);
gc.dispose();
Shell popup = new Shell(shell, SWT.SHELL_TRIM);
popup.setLayout(new FillLayout());
popup.setText("Image");
popup.setBounds(50, 50, 200, 200);
popup.addListener(SWT.Close, new Listener() {
public void handleEvent(Event e) {
image.dispose();
}
});
ScrolledComposite sc = new ScrolledComposite (popup, SWT.V_SCROLL | SWT.H_SCROLL);
Canvas canvas = new Canvas(sc, SWT.NONE);
sc.setContent(canvas);
canvas.setBounds(display.getBounds ());
canvas.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
e.gc.drawImage(image, 0, 0);
}
});
popup.open();
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
4、使用transform、alpha和paths混合技术绘图。注意：必须在项目中import“swt-gdip-win32-3139.dll”。
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setText("Advanced Graphics");
FontData fd = shell.getFont().getFontData()[0];
final Font font = new Font(display, fd.getName(), 60, SWT.BOLD | SWT.ITALIC);
final Image image = new Image(display, 640, 480);
final Rectangle rect = image.getBounds();
GC gc = new GC(image);
gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
gc.fillOval(rect.x, rect.y, rect.width, rect.height);
gc.dispose();
shell.addListener(SWT.Paint, new Listener() {
public void handleEvent(Event event) {
GC gc = event.gc;
Transform tr = new Transform(display);
tr.translate(50, 120);
tr.rotate(-30);
gc.drawImage(image, 0, 0, rect.width, rect.height, 0, 0, rect.width / 2, rect.height / 2);
gc.setAlpha(100);
gc.setTransform(tr);
Path path = new Path(display);
path.addString("SWT", 0, 0, font);
gc.setBackground(display.getSystemColor(SWT.COLOR_GREEN));
gc.setForeground(display.getSystemColor(SWT.COLOR_BLUE));
gc.fillPath(path);
gc.drawPath(path);
tr.dispose();
path.dispose();
}
});
shell.setSize(shell.computeSize(rect.width / 2, rect.height / 2));
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
image.dispose();
font.dispose();
display.dispose();
}
5、对图像进行旋转。
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);
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);
// Note that the tranform is applied to the whole GC therefore
// the coordinates need to be adjusted too.
// Reflect around the y axis.
transform.setElements(-1, 0, 0, 1, 0 ,0);
gc.setTransform(transform);
gc.drawImage(image, -1*x-rect.width, y);
x = 30; y += rect.height + 30;
// Reflect around the x axis.
transform.setElements(1, 0, 0, -1, 0, 0);
gc.setTransform(transform);
gc.drawImage(image, x, -1*y-rect.height);
x += rect.width + 30;
// Reflect around the x and y axes
transform.setElements(-1, 0, 0, -1, 0, 0);
gc.setTransform(transform);
gc.drawImage(image, -1*x-rect.width, -1*y-rect.height);
x = 30; y += rect.height + 30;
// 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);
// Rotate by 45 degrees
float cos45 = (float)Math.cos(45);
float sin45 = (float)Math.sin(45);
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();
}