[英]Custom graph - Java Swing
我正在尝试在Java中创建自定义动态直方图类型条形图。 我进行了很多搜索,但找不到实现此目的的方法。
我知道JFreeChart库,但它不能满足我的需求。 这就是JFreeChart直方图的样子:
但是我想要的是仅具有X轴的动态直方图。
这张经过photoshop处理的图像将使它更易于理解。
JFrame将具有固定的边界。 如您所见,不应有Y轴。 钢筋的高度应根据这些值自动调整。
请帮我建立这个! 提前致谢。
我再看一下JFreeChart
。 您可以使范围轴不可见,而改用项目标签。 没有图例,重写getItemPaint()
可以提供任意颜色。 这里显示了一种替代方法。
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Paint;
import javax.swing.JFrame;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.renderer.category.StandardBarPainter;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.TextAnchor;
/**
* @see https://stackoverflow.com/a/29709153/230513
*/
public class BarChart {
private CategoryDataset createDataset() {
String row = "Row";
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(350, row, "A");
dataset.addValue(690, row, "B");
dataset.addValue(510, row, "C");
dataset.addValue(570, row, "D");
dataset.addValue(180, row, "E");
dataset.addValue(504, row, "F");
return dataset;
}
private JFreeChart createChart(CategoryDataset dataset) {
CategoryAxis categoryAxis = new CategoryAxis("");
ValueAxis valueAxis = new NumberAxis("");
valueAxis.setVisible(false);
BarRenderer renderer = new BarRenderer() {
@Override
public Paint getItemPaint(int row, int column) {
switch (column) {
case 0:
return Color.red;
case 1:
return Color.yellow;
case 2:
return Color.blue;
case 3:
return Color.orange;
case 4:
return Color.gray;
case 5:
return Color.green.darker();
default:
return Color.red;
}
}
};
renderer.setDrawBarOutline(false);
renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(
ItemLabelAnchor.OUTSIDE12, TextAnchor.BOTTOM_CENTER));
renderer.setBaseItemLabelsVisible(Boolean.TRUE);
renderer.setBarPainter(new StandardBarPainter());
CategoryPlot plot = new CategoryPlot(dataset, categoryAxis, valueAxis, renderer);
JFreeChart chart = new JFreeChart("", JFreeChart.DEFAULT_TITLE_FONT, plot, false);
chart.setBackgroundPaint(Color.white);
return chart;
}
private void display() {
JFrame f = new JFrame("BarChart");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new ChartPanel(createChart(createDataset())));
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
new BarChart().display();
});
}
}
穷人的直方图:
import java.awt.*;
import java.util.List;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.border.*;
public class HistogramPanel extends JPanel
{
private int histogramHeight = 200;
private int barWidth = 50;
private int barGap = 10;
private JPanel barPanel;
private JPanel labelPanel;
private List<Bar> bars = new ArrayList<Bar>();
public HistogramPanel()
{
setBorder( new EmptyBorder(10, 10, 10, 10) );
setLayout( new BorderLayout() );
barPanel = new JPanel( new GridLayout(1, 0, barGap, 0) );
Border outer = new MatteBorder(1, 1, 1, 1, Color.BLACK);
Border inner = new EmptyBorder(10, 10, 0, 10);
Border compound = new CompoundBorder(outer, inner);
barPanel.setBorder( compound );
labelPanel = new JPanel( new GridLayout(1, 0, barGap, 0) );
labelPanel.setBorder( new EmptyBorder(5, 10, 0, 10) );
add(barPanel, BorderLayout.CENTER);
add(labelPanel, BorderLayout.PAGE_END);
}
public void addHistogramColumn(String label, int value, Color color)
{
Bar bar = new Bar(label, value, color);
bars.add( bar );
}
public void layoutHistogram()
{
barPanel.removeAll();
labelPanel.removeAll();
int maxValue = 0;
for (Bar bar: bars)
maxValue = Math.max(maxValue, bar.getValue());
for (Bar bar: bars)
{
JLabel label = new JLabel(bar.getValue() + "");
label.setHorizontalTextPosition(JLabel.CENTER);
label.setHorizontalAlignment(JLabel.CENTER);
label.setVerticalTextPosition(JLabel.TOP);
label.setVerticalAlignment(JLabel.BOTTOM);
int barHeight = (bar.getValue() * histogramHeight) / maxValue;
Icon icon = new ColorIcon(bar.getColor(), barWidth, barHeight);
label.setIcon( icon );
barPanel.add( label );
JLabel barLabel = new JLabel( bar.getLabel() );
barLabel.setHorizontalAlignment(JLabel.CENTER);
labelPanel.add( barLabel );
}
}
private class Bar
{
private String label;
private int value;
private Color color;
public Bar(String label, int value, Color color)
{
this.label = label;
this.value = value;
this.color = color;
}
public String getLabel()
{
return label;
}
public int getValue()
{
return value;
}
public Color getColor()
{
return color;
}
}
private class ColorIcon implements Icon
{
private int shadow = 3;
private Color color;
private int width;
private int height;
public ColorIcon(Color color, int width, int height)
{
this.color = color;
this.width = width;
this.height = height;
}
public int getIconWidth()
{
return width;
}
public int getIconHeight()
{
return height;
}
public void paintIcon(Component c, Graphics g, int x, int y)
{
g.setColor(color);
g.fillRect(x, y, width - shadow, height);
g.setColor(Color.GRAY);
g.fillRect(x + width - shadow, y + shadow, shadow, height - shadow);
}
}
private static void createAndShowGUI()
{
HistogramPanel panel = new HistogramPanel();
panel.addHistogramColumn("A", 350, Color.RED);
panel.addHistogramColumn("B", 690, Color.YELLOW);
panel.addHistogramColumn("C", 510, Color.BLUE);
panel.addHistogramColumn("D", 570, Color.ORANGE);
panel.addHistogramColumn("E", 180, Color.MAGENTA);
panel.addHistogramColumn("F", 504, Color.CYAN);
panel.layoutHistogram();
JFrame frame = new JFrame("Histogram Panel");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add( panel );
frame.setLocationByPlatform( true );
frame.pack();
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
}
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