/**
* This utility function makes it easy to check whether the coordinates of the user's mouse click
* (px,py) are on (or very close to) the ellipse defined by the bounding box with corners at
* (x1,y1) and (x2,y2).
*
* @param px x coordinate of mouse click
* @param py y coordinate of mouse click
* @param x1 x point of the first coordinate of object to check for mouse click proximity
* @param y1 y point of the first coordinate of object to check for mouse click proximity
* @param x2 x point of the second coordinate of object to check for mouse click proximity
* @param y2 y point of the second coordinate of object to check for mouse click proximity
* @return true if the coordinates of the user's mouse click (px,py) are on close to the ellipse
* defined by the bounding box with corners at (x1,y1) and (x2,y2).
*/
public static boolean clickHitEllipse(int px, int py, int x1, int y1, int x2, int y2) {
int minX = (x1 < x2 ? x1 : x2);
int minY = (y1 < y2 ? y1 : y2);
int maxX = (x1 > x2 ? x1 : x2);
int maxY = (y1 > y2 ? y1 : y2);
Ellipse2D.Float innerEllipse =
new Ellipse2D.Float(
minX + SELECTION_DISTANCE,
minY + SELECTION_DISTANCE,
maxX - minX - 2 * SELECTION_DISTANCE,
maxY - minY - 2 * SELECTION_DISTANCE);
Ellipse2D.Float outerEllipse =
new Ellipse2D.Float(
minX - SELECTION_DISTANCE,
minY - SELECTION_DISTANCE,
maxX - minX + 2 * SELECTION_DISTANCE,
maxY - minY + 2 * SELECTION_DISTANCE);
return outerEllipse.contains(px, py) && !innerEllipse.contains(px, py);
}
