gistfile1.java

public Circle getCircleAtPosition(MotionEvent event) {
	// List des distances des cercles candidats
		List<Float> distanceList = new ArrayList<Float>();

		// Listes des cercles candidats
		List<Circle> candidateList = new ArrayList<Circle>();
		int bestcandidate = 0;

		for (Circle c : circles) {
			// distance euclidienne
			float distance = (float) Math.sqrt(Math.pow(
					Math.abs(c.x - event.getX()), 2)
					+ Math.pow(Math.abs(c.y - event.getY()), 2));

			if (distance < c.radius) {
				distanceList.add(distance);
				candidateList.add(c);
			}
		}
		// selection du cercle le plus probable
		if (!candidateList.isEmpty()) {
			int counter = distanceList.size();
			int i;
			for (i = 1; i < counter; i++) {
				if (distanceList.get(i) - distanceList.get(bestcandidate) > 0) {
					bestcandidate = i;
				}
			}

			return circles.get(bestcandidate);
		} else {
			return null;
		}
	}