/** * 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)); } }