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  • 用JFreeChart画仪表盘

    DefaultValueDataset data = new DefaultValueDataset(32.0);
    MeterPlot plot = new MeterPlot(data);
    plot.setDialShape(DialShape.CHORD);
    plot.setDialBackgroundPaint(Color.WHITE);
    plot.setRange(new Range(0, 120));
    plot.setDialOutlinePaint(Color.GRAY);
    plot.setNeedlePaint(Color.BLACK);
    plot.setTickLabelsVisible(true);
    plot.setTickLabelPaint(Color.BLACK);
    plot.setTickPaint(Color.GRAY);
    plot.setTickLabelFormat(NumberFormat.getNumberInstance());
    plot.setTickSize(10);
    plot.setValuePaint(Color.BLACK);
    plot.addInterval(new MeterInterval("Low", new Range(0, 70), null, null,new Color(128, 255, 128,90) ));
    plot.addInterval(new MeterInterval("Normal", new Range(70, 100), null, null, new Color(255, 255, 128,90)));
    plot.addInterval(new MeterInterval("High", new Range(100, 120), null, null, new Color(255, 128, 128,90)));
    
    //创建chart,最后一个参数决定是否显示图例
    final JFreeChart chart = new JFreeChart("Meter Chart", JFreeChart.DEFAULT_TITLE_FONT, plot, false);
    
    //放到SWT的Composite里,以前介绍过这个方法
    Composite drawarea = new Composite(tabFolder, SWT.EMBEDDED);
    drawarea.setLayout(new FillLayout());
    Frame canvasFrame = SWT_AWT.new_Frame(drawarea);
    java.awt.Canvas canvas = new java.awt.Canvas() {
        public void paint(Graphics g) {
            super.paint(g);
            if (chart != null)
                chart.draw((Graphics2D) g, getBounds());
        }
    };
    TabItem tab = new TabItem(tabFolder, SWT.NONE);
    tab.setControl(drawarea);
    tab.setText("Meter");
    canvasFrame.add(canvas);

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  • 原文地址:https://www.cnblogs.com/bjzhanghao/p/673303.html
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