protected void paintComponent(Graphics g) {
int width = getWidth();
// Paint background if we're opaque.
if (isOpaque()) {
g.setColor(getBackground());
g.fillRect(0, 0, width, getHeight());
}
g.setColor(getForeground());
double step = ((double) width) / fvar.getStepNumber();
double lastX = 0;
double newX;
int lastY = getY(fvar.getStepValue(0));
int newy;
for (int i = 0; i < fvar.getStepNumber(); i++) {
newy = getY(fvar.getStepValue(i + 1));
newX = lastX + step;
g.drawLine((int) lastX, lastY, (int) newX, newy);
lastY = newy;
lastX = newX;
}
if (lastX < (double) width) {
g.drawLine((int) lastX, lastY, width, lastY);
}
}
/** converts the mouse's y into the corresponding value in the function's range */
protected double realY(int mouseY) {
if (fvar.isConstant()) return fvar.getYmax();
int h = getHeight();
double ymax = fvar.getYmax();
return ymax
+ (fvar.getYmin() - ymax) * (mouseY - h * (1 - croppingFactor) * 0.5) / h / croppingFactor;
}
/** converts some y in the fun's range into a mouse y coordinate */
protected int getY(double y) {
int h = getHeight();
if (fvar.isConstant()) return (int) h / 2;
else {
double ymax = fvar.getYmax();
return (int)
((h * (1 - croppingFactor) / 2.0)
+ h * croppingFactor * (y - ymax) / (fvar.getYmin() - ymax));
}
}
/**
* Builds a top-level window from the variations of a function
*
* @see FunctionVariations
*/
public CurveFrame(FunctionVariations fvar) {
super("Curve");
tracer = new CurveTracer(fvar);
infos = new CurveInfos(fvar);
controls = new CurveControls(fvar, this);
JPanel mainPane = new JPanel(new BorderLayout());
mainPane.add(tracer, BorderLayout.CENTER);
mainPane.add(infos, BorderLayout.SOUTH);
mainPane.add(controls, BorderLayout.EAST);
tracer.addMouseListener(
new MouseAdapter() {
CurveFrame cf = CurveFrame.this;
public void mouseEntered(MouseEvent e) {
cf.infos.xmouse.setText("x = " + cf.tracer.realX(e.getX()));
cf.infos.ymouse.setText("y = " + cf.tracer.realY(e.getY()));
cf.infos.repaint();
}
public void mouseExited(MouseEvent e) {
cf.infos.xmouse.setText("");
cf.infos.ymouse.setText("");
cf.infos.repaint();
}
});
tracer.addMouseMotionListener(
new MouseMotionAdapter() {
CurveFrame cf = CurveFrame.this;
public void mouseMoved(MouseEvent e) {
cf.infos.xmouse.setText("x = " + cf.tracer.realX(e.getX()));
cf.infos.ymouse.setText("y = " + cf.tracer.realY(e.getY()));
// cf.infos.repaint();
}
public void mouseDragged(MouseEvent e) {
cf.infos.xmouse.setText("x = " + cf.tracer.realX(e.getX()));
cf.infos.ymouse.setText("y = " + cf.tracer.realY(e.getY()));
cf.infos.repaint();
}
});
fvar.tabulate(controls.currentPrecision());
setContentPane(mainPane);
pack();
infos.update();
setVisible(true);
}
/** converts the mouse's x into some value of the considered interval. correction 29/03/1999 */
protected double realX(int mouseX) {
double xmin = fvar.getXmin();
return xmin + (mouseX * (fvar.getXmax() - xmin) / getWidth());
}
