/**
* Draws a double headed arrow with arrow heads of a given width and height.
*
* @param aG the canvas to draw on;
* @param aX1 the starting X position of the arrow;
* @param aY1 the starting Y position of the arrow;
* @param aX2 the ending X position of the arrow;
* @param aY2 the ending Y position of the arrow;
* @param aArrowWidth the total width of the arrow head;
* @param aArrowHeight the total height of the arrow head.
*/
public static final void drawDoubleHeadedArrow(
final Graphics aG,
final int aX1,
final int aY1,
final int aX2,
final int aY2,
final int aArrowWidth,
final int aArrowHeight) {
final Graphics2D g2d = (Graphics2D) aG.create();
final int lineWidth = Math.abs(aX2 - aX1);
final int threshold = (2 * aArrowWidth) + 2;
try {
int x1 = aX1;
int x2 = aX2;
if (lineWidth > threshold) {
drawArrowHead(g2d, aX1, aY1, LEFT_FACING, aArrowWidth, aArrowHeight);
// why x2 needs to be shifted by one pixel is beyond me...
drawArrowHead(g2d, aX2 + 1, aY2, RIGHT_FACING, aArrowWidth, aArrowHeight);
x1 += aArrowWidth - 1;
x2 -= aArrowWidth + 1;
}
g2d.drawLine(x1, aY1, x2, aY2);
} finally {
g2d.dispose();
}
}
@Override
public void paintIcon(Component c, Graphics g, int x, int y) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.translate(x, y);
g2.setStroke(new BasicStroke(BORDER_WIDTH));
g2.setPaint(LINE_COLOR);
g2.draw(BORDER);
g2.setStroke(new BasicStroke(SLIT_WIDTH));
g2.setColor(UIManager.getColor("Panel.background"));
int n = SLIT_NUM + 1;
int v = ICON_SIZE / n;
int m = n * v;
for (int i = 1; i < n; i++) {
int a = i * v;
g2.drawLine(a, 0, a, m);
g2.drawLine(0, a, m, a);
}
// g2.drawLine(1 * v, 0 * v, 1 * v, 4 * v);
// g2.drawLine(2 * v, 0 * v, 2 * v, 4 * v);
// g2.drawLine(3 * v, 0 * v, 3 * v, 4 * v);
// g2.drawLine(0 * v, 1 * v, 4 * v, 1 * v);
// g2.drawLine(0 * v, 2 * v, 4 * v, 2 * v);
// g2.drawLine(0 * v, 3 * v, 4 * v, 3 * v);
g2.setPaint(LINE_COLOR);
Rectangle2D b = ARROW.getBounds();
Point2D p = new Point2D.Double(b.getX() + b.getWidth() / 2d, b.getY() + b.getHeight() / 2d);
AffineTransform toCenterAT =
AffineTransform.getTranslateInstance(ICON_SIZE / 2d - p.getX(), ICON_SIZE / 2d - p.getY());
g2.fill(toCenterAT.createTransformedShape(ARROW));
g2.dispose();
}