java - SWT GC : Color not correctly drawn on Windows

Question

仍在寻找解决方案

我有以下问题:我使用 SWT GC 将 GraphNodes 中包含的图形绘制到 Zest Graph。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。颜色未正确绘制且没有透明度(通过 GC 的 setAlpha() 实现)。

这里有两个截图来说明我的问题:

Linux:

Windows :

编辑:

我刚刚创建了这个有效的“迷你”示例来进行测试。如果有人知道为什么矩形在 Windows 上是黑色的，我将不胜感激。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();
        }
    }
}

Answer 1

您的程序中使用的灰色图像与 Tobias Willig 发布的白色图像明显不同:

灰色:

Image Width: 28 Image Length: 28
Bitdepth (Bits/Sample): 1
Channels (Samples/Pixel): 1
Pixel depth (Pixel Depth): 1
Colour Type (Photometric Interpretation): PALETTED COLOUR (1 colours, 0 transparent)
Image filter: Single row per byte filter
Interlacing: No interlacing
Compression Scheme: Deflate method 8, 32k window
Resolution: 2835, 2835 (pixels per meter)
FillOrder: msb-to-lsb
Byte Order: Network (Big Endian)
Number of text strings: 0 of 0

白色:

Image Width: 28 Image Length: 28
Bitdepth (Bits/Sample): 8
Channels (Samples/Pixel): 3
Pixel depth (Pixel Depth): 24
Colour Type (Photometric Interpretation): RGB
Image filter: Single row per byte filter
Interlacing: No interlacing
Compression Scheme: Deflate method 8, 32k window
Resolution: 2835, 2835 (pixels per meter)
FillOrder: msb-to-lsb
Byte Order: Network (Big Endian)
Number of text strings: 0 of 0

如您所见，灰色图像的颜色类型仅包含一种颜色，而白色图像的一种颜色是 RGB。

所以肯定是图像导致了您的问题。