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1   package ca.uhn.hl7v2.testpanel.ui.conn;
2   
3   import static org.apache.commons.lang.StringUtils.*;
4   
5   import java.awt.BorderLayout;
6   import java.awt.Color;
7   import java.awt.FontMetrics;
8   import java.awt.Graphics;
9   import java.awt.Graphics2D;
10  import java.util.ArrayList;
11  import java.util.Arrays;
12  import java.util.List;
13  
14  import javax.swing.JComponent;
15  import javax.swing.JFrame;
16  import javax.swing.JLabel;
17  import javax.swing.JPanel;
18  
19  public class JGraph extends JComponent {
20  
21  	private List<Integer> myValues;
22  	private float myMax;
23  	private Color myLineColor;
24  	private String myText;
25  	private Color myTextColor;
26  
27  	public JGraph() {
28  		setBackground(new Color(0.2f, 0.2f, 0.7f));
29  		myLineColor = new Color(0.9f, 0.9f, 1.0f);
30  		myTextColor = new Color(0.3f, 0.6f, 1.0f);
31  	}
32  
33  	/**
34  	 * @param theValues
35  	 *            the values to set
36  	 */
37  	public void setValues(List<Integer> theValues) {
38  		myValues = theValues;
39  		myMax = -1;
40  		repaint();
41  	}
42  
43  	public void setText(String theText) {
44  		myText = theText;
45  		repaint();
46  	}
47  
48  	/*
49  	 * (non-Javadoc)
50  	 * 
51  	 * @see javax.swing.JComponent#paint(java.awt.Graphics)
52  	 */
53  	@Override
54  	public void paintComponent(Graphics theG) {
55  
56  		Graphics2D g = (Graphics2D) getGraphics().create();
57  
58  		if (myValues == null || myValues.size() == 0) {
59  			 myValues = new ArrayList<Integer>();
60  			 myValues.add(0);
61  		}
62  
63  		if (myMax <= 0) {
64  			for (Integer next : myValues) {
65  				myMax = Math.max(myMax, next);
66  			}
67  		}
68  		myMax = Math.max(myMax, 1);
69  
70  		g.setColor(getBackground());
71  		g.fillRect(0, 0, getWidth(), getHeight());
72  
73  		if (isNotBlank(myText)) {
74  			FontMetrics metrics = g.getFontMetrics();
75  			int hgt = metrics.getHeight();
76  			int adv = metrics.stringWidth(myText);
77  			g.setColor(myTextColor);
78  			int x = (getWidth() / 2) - (adv / 2);
79  			x = Math.max(0, x);
80  			int y = (getHeight() / 2) - (hgt / 2);
81  			y = Math.max(0, y);
82  			y = getHeight() - y;
83  			g.drawString(myText, x, y);
84  		}
85  
86  		int nextLeft = 0;
87  		int prevY = -1;
88  		int width = getWidth() / myValues.size();
89  		for (int i = 0; i < myValues.size(); i++) {
90  			int nextValue = myValues.get(i);
91  			float heightProp = ((float) nextValue / myMax);
92  			int componentHeight = getHeight();
93  			int top = (int) (componentHeight - (getHeight() * heightProp));
94  
95  			g.setColor(myLineColor);
96  
97  			if (prevY == -1) {
98  				prevY = top;
99  			}
100 
101 			g.drawLine(nextLeft, prevY, nextLeft + width, top);
102 
103 			nextLeft += width;
104 			prevY = top;
105 		}
106 
107 		g.dispose();
108 	}
109 
110 	public void setValues(Integer... theValues) {
111 		setValues(Arrays.asList(theValues));
112 	}
113 
114 	public static void main(String[] args) {
115 
116 		JFrame jfr = new JFrame();
117 		jfr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
118 		jfr.setSize(200, 100);
119 
120 		JPanel cpanel = new JPanel(new BorderLayout());
121 		jfr.add(cpanel);
122 
123 		cpanel.add(new JLabel("West"), BorderLayout.WEST);
124 		cpanel.add(new JLabel("East"), BorderLayout.EAST);
125 		cpanel.add(new JLabel("North"), BorderLayout.NORTH);
126 		cpanel.add(new JLabel("South"), BorderLayout.SOUTH);
127 
128 		JGraph graph = new JGraph();
129 		cpanel.add(graph);
130 
131 		graph.setValues(1, 2, 3);
132 		graph.setText("some teXT");
133 
134 		jfr.setVisible(true);
135 
136 	}
137 
138 }