In this code points can be moved along a vertical line:
| Код |
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
public class Translation extends JPanel
{
JLabel xLabel;
JLabel yLabel;
NumberFormat nf;
double[] data = { 16.0, 32.9, 7.4, 18.9, 12.3 };
final int Y_GRADS = 5;
final int PAD = 35;
final int SPAD = 3;
final int TICK = 2;
boolean caught = false;
double maxVal;
int pointChanged = -1;
public Translation()
{
nf = NumberFormat.getInstance();
nf.setMinimumFractionDigits(1);
nf.setMaximumFractionDigits(1);
maxVal = getMaxValue();
addMouseMotionListener(sweep);
addMouseMotionListener(myMouseMotionListener);
addMouseListener(myMouseListener);
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
drawAxes(g2);
plotData(g2);
}
private void plotData(Graphics2D g2) {
for(int j = 0; j < data.length; j++) {
Point2D.Double p = modelToView(j, data[j]);
if(j < data.length-1) {
Point2D.Double next = modelToView(j+1, data[j+1]);
g2.setPaint(Color.blue);
g2.draw(new Line2D.Double(p, next));
}
g2.setPaint(Color.red);
g2.fill(new Ellipse2D.Double(p.x-2, p.y-2, 4, 4));
}
}
private Point2D.Double modelToView(double x, double y) {
double h = getHeight();
Point2D.Double p = new Point2D.Double();
p.x = PAD + x*(getWidth() - 2*PAD)/(data.length-1);
p.y = h-PAD - y*(h - 2*PAD)/maxVal;
return p;
}
public Point2D.Double viewToModel(double x, double y)
{
double h = getHeight();
Point2D.Double p = new Point2D.Double();
p.x = (x - PAD) * (data.length-1) / (getWidth() - 2*PAD);
p.y = (h - PAD - y) * maxVal / (h - 2*PAD);
return p;
}
private void drawAxes(Graphics2D g2)
{
int w = getWidth();
int h = getHeight();
double xInc = (double)(w - 2*PAD)/(data.length-1);
double yInc = (double)(h - 2*PAD)/Y_GRADS;
// Abcissa
g2.draw(new Line2D.Double(PAD, h-PAD, w-PAD, h-PAD));
// Tick marks
double y1 = h-PAD, y2 = y1+TICK;
for(int j = 0; j <= data.length; j++) {
double x = PAD + j*xInc;
g2.draw(new Line2D.Double(x, y1, x, y2));
}
// Labels
Font font = g2.getFont().deriveFont(14f);
g2.setFont(font);
FontRenderContext frc = g2.getFontRenderContext();
LineMetrics lm = font.getLineMetrics("0", frc);
float sx, sy = h - PAD + SPAD + lm.getAscent();
for(int j = 0; j < data.length; j++) {
String s = String.valueOf(j);
float width = (float)font.getStringBounds(s, frc).getWidth();
sx = (float)(PAD + j*xInc - width/2);
g2.drawString(s, sx, sy);
}
// Ordinate
g2.draw(new Line2D.Double(PAD, PAD, PAD, h-PAD));
// Tick marks
double x1 = PAD, x2 = PAD-TICK;
for(int j = 0; j <= Y_GRADS; j++)
{
double y = PAD + j*yInc;
g2.draw(new Line2D.Double(x1, y, x2, y));
}
// Labels
for(int j = 0; j <= data.length; j++)
{
String s = nf.format(maxVal*(1.0 - (double)j/data.length));
float width = (float)font.getStringBounds(s, frc).getWidth();
sx = (float)(PAD - SPAD - width);
sy = (float)(PAD + j*yInc + lm.getAscent()/3);
g2.drawString(s, sx, sy);
}
}
private double getMaxValue() {
double max = -Double.MAX_VALUE;
for(int j = 0; j < data.length; j++) {
if(data[j] > max) {
max = data[j];
}
}
return max;
}
MouseMotionListener sweep = new MouseMotionAdapter()
{
public void mouseMoved(MouseEvent e)
{
Point2D.Double p = viewToModel(e.getX(), e.getY());
xLabel.setText(nf.format(p.x));
yLabel.setText(nf.format(p.y));
}
};
MouseMotionListener myMouseMotionListener = new MouseMotionAdapter()
{
public void mouseDragged(MouseEvent e)
{
//checkForCaught(e);
}
};
private void checkForCaught(MouseEvent e)
{
Point2D.Double p = viewToModel(e.getX(), e.getY());
System.out.println(p.x+" "+p.y);
double dx = 0.5;//further calculateDx();
double dy = 0.5;//
for (int i=0;i<data.length;i++)
{
if ( (p.x>(i-dx)) && (p.x<(i+dx)) && (p.y>(data[i]-dy))&& (p.y<(data[i]+dy)))
{
System.out.println("Caught");
caught = true;
pointChanged = i;
}
}
}
MouseListener myMouseListener = new MouseAdapter()
{
public void mouseReleased(MouseEvent e)
{
Point2D.Double p = viewToModel(e.getX(), e.getY());
if (caught)
{
data[pointChanged] = p.y;
caught = false;
System.out.println("data changed");
redraw();
}
}
public void mousePressed(MouseEvent e)
{
System.out.println("Pressed");
checkForCaught(e);
}
};
public void redraw()
{
paintComponent(this.getGraphics());
}
private JPanel getLast()
{
xLabel = new JLabel();
yLabel = new JLabel();
Dimension d = new Dimension(45, 25);
JPanel panel = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(2,2,2,2);
addComponents(new JLabel("x ="), xLabel, panel, gbc, d, true);
addComponents(new JLabel("y ="), yLabel, panel, gbc, d, false);
return panel;
}
private void addComponents(JComponent c1, JComponent c2, Container c,
GridBagConstraints gbc, Dimension d, boolean b) {
gbc.weightx = b ? 1.0 : 0;
gbc.anchor = GridBagConstraints.EAST;
c.add(c1, gbc);
c2.setPreferredSize(d);
gbc.weightx = b ? 0 : 1.0;
gbc.anchor = GridBagConstraints.WEST;
c.add(c2, gbc);
}
public static void main(String[] args)
{
Translation test = new Translation();
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(test);
f.getContentPane().add(test.getLast(), "Last");
f.setSize(500,400);
f.setLocation(200,200);
f.setVisible(true);
}
}
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