PlotInstanceLegendCreator.java 文件源码

private static Paint createTransparentCheckeredPaint(Color color, int checkerSize) {
    int s = checkerSize;
    BufferedImage bufferedImage = new BufferedImage(2 * s, 2 * s, BufferedImage.TYPE_INT_ARGB);

    Graphics2D g2 = bufferedImage.createGraphics();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, // Anti-alias!
            RenderingHints.VALUE_ANTIALIAS_ON);

    Color c1 = DataStructureUtils.setColorAlpha(color, (int) (color.getAlpha() * .8));
    Color c2 = DataStructureUtils.setColorAlpha(color, (int) (color.getAlpha() * .2));
    g2.setStroke(new BasicStroke(0));
    g2.setPaint(c2);
    g2.setColor(c2);
    g2.fillRect(0, 0, s, s);
    g2.fillRect(s, s, s, s);
    g2.setPaint(c1);
    g2.setColor(c1);
    g2.fillRect(0, s, s, s);
    g2.fillRect(s, 0, s, s);

    // paint with the texturing brush
    Rectangle2D rect = new Rectangle2D.Double(0, 0, 2 * s, 2 * s);
    return new TexturePaint(bufferedImage, rect);
}