java – SWT GC：在Windows上未正确绘制颜色

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仍在寻找解决方案

我有以下问题：我使用SWT GC将GraphNodes中包含的数字绘制到Zest图.
就Linux和MacOS而言,一切正常.但是当我在Windows上运行我的jar时,节点看起来很奇怪.颜色没有正确绘制,没有透明度(通过GC的setAlpha()实现).

这是两个截图来说明我的问题：

Linux的：

视窗：

编辑：

我刚刚创建了这个工作“迷你”的例子来测试.如果有人有想法,为什么矩形在窗户上是黑色的,我会非常感谢答案.这是back.png图片：

import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.Figure;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.Label;
import org.eclipse.draw2d.ToolbarLayout;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.zest.core.widgets.Graph;
import org.eclipse.zest.core.widgets.GraphNode;
import org.eclipse.zest.core.widgets.IContainer;

public class MiniExample
{
    public static void main(String[] args)
    {
        Display display = Display.getDefault();
        Shell shell = new Shell(display);

        Graph graph = new Graph(shell, SWT.NONE);
        graph.setSize(100, 100);

        CustomFigure fig = new CustomFigure(new Label());
        fig.setSize(-1, -1);
        CustomNode node = new CustomNode(graph, SWT.NONE, fig);
        node.setLocation(5, 5);

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

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

    /* Minimal helper class for the figure */
    static class CustomFigure extends Figure
    {
        private Image background = new Image(Display.getDefault(), "back.png");
        private GC gcBack = new GC(background);
        private Label all = new Label(background);
        private Color blau =  new Color(Display.getDefault(), 19, 59, 94);

        public CustomFigure(Label label)
        {
            ToolbarLayout layout = new ToolbarLayout();
            setLayoutManager(layout);
            setMiddle(3);
            add(all);
        }

        /* The problem has to occur somewhere here... */
        public void setMiddle(int value)
        {
            gcBack.setBackground(blau);
            gcBack.setForeground(blau);
            gcBack.setAlpha(255);

            /* color background blue and draw the nr of connections */
            gcBack.drawRoundRectangle(6, 6, 15, 15, 3, 3);
            gcBack.fillRoundRectangle(6, 6, 15, 15, 3, 3);
            gcBack.setForeground(ColorConstants.white);
            gcBack.drawText(value+"", 9, 6, true);

            gcBack.setAlpha(255);

            all.repaint();
        }
    }

    /* Minimal helper class for the node */
    static class CustomNode extends GraphNode
    {
        public CustomNode(IContainer graphModel, int style, CustomFigure figure)
        {
            super(graphModel, style, figure);
        }
        @Override
        protected IFigure createFigureForModel()
        {
            return (IFigure) this.getData();
        }
    }
}

解决方法:

这绝对是你背景图片导致问题的原因.我用以下示例运行了一些测试.我使用纯白色背景图像和背景图像.使用白色背景图像一切都很好,但如果我使用背景图像,则仅绘制黑色.它很可能是SWT中的一个错误.

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class MiniExample {
    public static void main( String[] args ) {
        Display display = Display.getDefault();
        Shell shell = new Shell( display );

        ACanvas canvas = new ACanvas( shell, SWT.None );
        canvas.setSize( 150, 150 );

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

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

static class ACanvas extends Canvas {

    public ACanvas( Composite parent, int style ) {
        super( parent, style );

        this.addPaintListener( new PaintListener() {

            @Override
            public void paintControl( PaintEvent arg0 ) {
                int value = 5;
                Image background = new Image( Display.getDefault(), "back2.png" );
                GC gcBack = new GC( background );
                //Color blue = Display.getDefault().getSystemColor( SWT.COLOR_BLUE );
                Color blue = new Color( Display.getDefault(), 0, 0, 255 );

                gcBack.setBackground( blue );
                gcBack.setForeground( blue );
                gcBack.setAlpha( 255 );

                gcBack.drawRoundRectangle( 6, 6, 15, 15, 3, 3 );
                gcBack.fillRoundRectangle( 6, 6, 15, 15, 3, 3 );

                gcBack.setForeground( Display.getDefault().getSystemColor( SWT.COLOR_WHITE ) );
                gcBack.drawText( value + "", 9, 6, true );

                gcBack.setAlpha( 255 );

                arg0.gc.drawImage( background, 0, 0 );
            }

        } );
    }

}

}

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