/**
* Return the axis values for the given pixel location on this graph.
*
* @param x The x pixel location on the graph.
* @param y The y pixel location on the graph.
* @return the x and y values for the given pixel location.
*/
public double[] getValueAt(int x, int y) {
Insets insets = getInsets();
double v[] = new double[2];
v[0] = xAxis != null ? xAxis.getValue(x - insets.left) : 0.;
v[1] = yAxis != null ? yAxis.getValue(getHeight() - y - insets.bottom) : 0.;
return v;
}
public void componentResized(ComponentEvent e) {
Dimension dim = getSize();
Insets insets = getInsets();
Rectangle dataArea =
new Rectangle(
insets.left,
insets.top,
dim.width - insets.left - insets.right - 1,
dim.height - insets.top - insets.bottom - 1);
if (xAxis.getSize() != dataArea.width - 2) {
xAxis.setSize(dataArea.width);
}
if (yAxis.getSize() != dataArea.height - 2) {
yAxis.setSize(dataArea.height);
}
}
/**
* Called by the paint method to draw the graph and its graph items.
*
* @param g the graphics context.
*/
public void paintComponent(Graphics g) {
Dimension dim = getSize();
Insets insets = getInsets();
dataArea =
new Rectangle(
insets.left,
insets.top,
dim.width - insets.left - insets.right - 1,
dim.height - insets.top - insets.bottom - 1);
// background
if (isOpaque()) {
g.setColor(getBackground());
g.fillRect(0, 0, dim.width, dim.height);
}
g.setColor(getForeground());
// get axis tickmarks
double xticks[] = xAxis.getTicks();
double yticks[] = yAxis.getTicks();
int yb = dataArea.y + dataArea.height;
// draw grid
if (showGrid) {
g.setColor(gridColor != null ? gridColor : getBackground().darker());
// vertical x grid lines
for (int i = 0; i < xticks.length; i += 2) {
int x = dataArea.x + (int) Math.round(xticks[i]);
g.drawLine(x, dataArea.y, x, dataArea.y + dataArea.height);
}
// horizontal y grid lines
for (int i = 0; i < yticks.length; i += 2) {
int y = yb - (int) Math.round(yticks[i]);
g.drawLine(dataArea.x, y, dataArea.x + dataArea.width, y);
}
}
for (int i = 0; i < graphItems.size(); i++) {
((GraphItem) graphItems.elementAt(i)).draw(this, g, dataArea, xAxis, yAxis);
}
if (sPt != null && ePt != null) {
g.setColor(getForeground());
g.drawRect(
Math.min(sPt.x, ePt.x), Math.min(sPt.y, ePt.y),
Math.abs(ePt.x - sPt.x), Math.abs(ePt.y - sPt.y));
}
}
public int showDialog(JChart chart) {
JOptionPane optionPane =
new JOptionPane(
optionPanel,
JOptionPane.QUESTION_MESSAGE,
JOptionPane.OK_CANCEL_OPTION,
null,
null,
null);
optionPane.setBorder(new EmptyBorder(12, 12, 12, 12));
Axis xAxis = chart.getXAxis();
Axis yAxis = chart.getYAxis();
if (canLogXAxis) {
logXAxis.setSelected(xAxis instanceof LogAxis);
}
if (canLogYAxis) {
logYAxis.setSelected(yAxis instanceof LogAxis);
}
if (!manualXAxis.isSelected()) {
minXValue.setValue(xAxis.getMinAxis());
maxXValue.setValue(xAxis.getMaxAxis());
}
if (!manualYAxis.isSelected()) {
minYValue.setValue(yAxis.getMinAxis());
maxYValue.setValue(yAxis.getMaxAxis());
}
final JDialog dialog = optionPane.createDialog(frame, "Setup Chart");
dialog.pack();
dialog.setVisible(true);
final Integer value = (Integer) optionPane.getValue();
final int result = (value != null && value != -1) ? value : JOptionPane.CANCEL_OPTION;
if (result == JOptionPane.OK_OPTION) {
applySettings(chart);
}
return result;
}
public void applySettings(JChart chart) {
Axis xAxis = chart.getXAxis();
Axis yAxis = chart.getYAxis();
if (canLogXAxis) {
if (logXAxis.isSelected()) {
xAxis = new LogAxis();
} else {
xAxis = new LinearAxis();
}
chart.setXAxis(xAxis);
}
if (manualXAxis.isSelected()) {
xAxis.setManualRange(minXValue.getValue(), maxXValue.getValue());
xAxis.setAxisFlags(Axis.AT_VALUE, Axis.AT_VALUE);
} else {
xAxis.setAxisFlags(defaultMinXAxisFlag, defaultMaxXAxisFlag);
}
if (canLogYAxis) {
if (logYAxis.isSelected()) {
yAxis = new LogAxis();
} else {
yAxis = new LinearAxis();
}
chart.setYAxis(yAxis);
}
if (manualYAxis.isSelected()) {
yAxis.setManualRange(minYValue.getValue(), maxYValue.getValue());
yAxis.setAxisFlags(Axis.AT_VALUE, Axis.AT_VALUE);
} else {
yAxis.setAxisFlags(defaultMinYAxisFlag, defaultMaxYAxisFlag);
}
}
/**
* high-level method for drawing a chart axis line plus labeled tic marks. introduces a dependancy
* on AWT because it takes a Graphics parameter. perhaps this method belongs in some higher-level
* class but i added it here since it's highly related with the tic lable generation code.
*
* @author Melinda Green
* @param axis is one of Axis.X_AXIS or Axis.Y_AXIS.
* @param maxTics is the maximum number of labeled tics to draw. note: the actual number drawn may
* be less.
* @param lowVal is the smallest value tic mark that may be drawn. note: the lowest valued tic
* label may be greater than this limit.
* @param highVal is the largest value tic mark that may be drawn. note: the highest valued tic
* label may be less than this limit.
* @param screenStart is the coordinate in the low valued direction.
* @param screenEnd is the coordinate in the high valued direction.
* @param offset is the coordinate in the direction perpendicular to the specified direction.
* @param logScale is true if a log scale axis is to be drawn, false for a linear scale.
* @param screenHeight is needed to flip Y coordinates.
* @param g is the AWT Graphics object to draw into. note: all drawing will be done in the current
* color of the given Graphics object.
*/
public static void drawAxis(
int axis,
int maxTics,
int ticLength,
float lowVal,
float highVal,
int screenStart,
int screenEnd,
int screenOffset,
boolean logScale,
int screenHeight,
Graphics g) {
if (logScale && (lowVal == 0 || highVal == 0))
throw new IllegalArgumentException("Axis.drawAxis: zero range value not allowed in log axes");
if (axis == X_AXIS) // horizontal baseline
g.drawLine(screenStart, screenHeight - screenOffset, screenEnd, screenHeight - screenOffset);
else
// vertical baseline
g.drawLine(screenOffset, screenStart, screenOffset, screenEnd);
Vector tics = Axis.computeTicks(lowVal, highVal, maxTics, logScale); // nice
// round
// numbers
// for
// tic
// labels
int last_label_end = axis == X_AXIS ? -88888 : 88888;
String dbgstr = "tics: ";
for (Enumeration e = tics.elements(); e.hasMoreElements(); ) {
String ticstr = (String) e.nextElement();
if (DEBUG) dbgstr += ticstr + ", ";
float ticval = Float.parseFloat(ticstr);
int tic_coord = screenStart;
Dimension str_size = stringSize(ticstr, g);
tic_coord +=
plotValue(ticval, lowVal, highVal, screenStart, screenEnd, logScale, screenHeight);
if (axis == X_AXIS) { // horizontal axis == vertical tics
g.drawLine(
tic_coord,
screenHeight - screenOffset,
tic_coord,
screenHeight - screenOffset + ticLength);
if (tic_coord - str_size.width / 2 > last_label_end) {
g.drawString(
ticstr,
tic_coord - str_size.width / 2,
screenHeight - screenOffset + str_size.height + 5);
last_label_end = tic_coord + str_size.width / 2 + str_size.height / 2;
}
} else { // vertical axis == horizontal tics
tic_coord = screenHeight - tic_coord; // flips Y coordinates
g.drawLine(screenOffset - ticLength, tic_coord, screenOffset, tic_coord);
if (tic_coord - str_size.height / 3 < last_label_end) {
g.drawString(
ticstr,
screenOffset - ticLength - str_size.width - 5,
tic_coord + str_size.height / 3);
last_label_end = tic_coord - str_size.height;
}
}
}
if (DEBUG) System.out.println(dbgstr);
} // end drawAxis
