/**
* Return the graph items for this graph.
*
* @return the graph items for this graph.
*/
public GraphItem[] getGraphItems() {
GraphItem gia[] = new GraphItem[graphItems.size()];
for (int i = 0; i < graphItems.size(); i++) {
gia[i] = (GraphItem) graphItems.elementAt(i);
}
return gia;
}
/**
* Add the graph item to the graph.
*
* @param graphItem Item to be added to the graph.
*/
public void addGraphItem(GraphItem graphItem) {
if (graphItem != null) {
graphItems.addElement(graphItem);
graphItem.addGraphItemListener(graphItemListener);
}
repaint();
}
/**
* 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));
}
}
/**
* Remove the graph item from the graph.
*
* @param graphItem Item to be removed from the graph.
*/
public void removeGraphItem(GraphItem graphItem) {
graphItems.removeElement(graphItem);
graphItem.removeGraphItemListener(graphItemListener);
repaint();
}