如何在java中用swt显示图像？
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How to show up an image with swt in java?
提问by lex
My try as follows,which doesn't come up with anything:
我的尝试如下，但没有任何结果：
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
Image image = new Image(display,
"D:/topic.png");
GC gc = new GC(image);
gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
gc.drawText("I've been drawn on",0,0,true);
gc.dispose();
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
// TODO Auto-generated method stub
}
回答by stacker
See the SWT-Snippetsfor examples. This oneuses an image label
有关示例，请参阅SWT-Snippets。这个使用图像标签
Shell shell = new Shell (display);
Label label = new Label (shell, SWT.BORDER);
label.setImage (image);
回答by Favonius
You are missing one thing in your code. Event Handlerfor paint. Normally when you create a component it generates a paint event. All the drawing related stuff should go in it. Also you need not to create the GC explicitly.. It comes with the event object :)
您的代码中缺少一件事。绘制的事件处理程序。通常，当您创建一个组件时，它会生成一个绘制事件。所有与绘图相关的东西都应该放在里面。此外，您无需显式创建 GC .. 它带有事件对象 :)
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class ImageX
{
public static void main (String [] args)
{
Display display = new Display ();
Shell shell = new Shell (display, SWT.SHELL_TRIM | SWT.DOUBLE_BUFFERED);
shell.setLayout(new FillLayout ());
final Image image = new Image(display, "C:\temp\flyimage1.png");
shell.addListener (SWT.Paint, new Listener ()
{
public void handleEvent (Event e) {
GC gc = e.gc;
int x = 10, y = 10;
gc.drawImage (image, x, y);
gc.dispose();
}
});
shell.setSize (600, 400);
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ())
display.sleep ();
}
if(image != null && !image.isDisposed())
image.dispose();
display.dispose ();
}
}
