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Hey I was writing a quick program and something came across where I need to use a circle for collision detection. But as far as I know, there is only the Rectangle class that has the .intersects(Point p) method. Is there anything like a circle that I could use the same way?
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The Circle class creates a new circle with the specified radius and center location measured in pixels. Example usage. The following code creates a circle with radius of 50 pixels centered at (100,100). import javafx.
Class Rectangle. A Rectangle specifies an area in a coordinate space that is enclosed by the Rectangle object's upper-left point (x,y) in the coordinate space, its width, and its height. A Rectangle object's width and height are public fields.
The Shape interface provides definitions for objects that represent some form of geometric shape. The Shape is described by a PathIterator object, which can express the outline of the Shape as well as a rule for determining how the outline divides the 2D plane into interior and exterior points.
In Java, to draw a rectangle (outlines) onto the current graphics context, we can use the following methods provided by the Graphics/Graphics2D class: drawRect(int x, int y, int width, int height) draw3DRect(int x, int y, int width, int height, boolean raised) draw(Rectangle2D)
There is a class called Ellipse2D in the java.awt.geom package that you can use, since it has some methods that appears to be what you're looking for. An ellipse with a width equal to its height is a circle.
One of the overloads for contains allows you to test for circle-point collisions:
boolean contains(double x, double y)Tests if the specified coordinates are inside the boundary of the
Shape, as described by the definition of insideness.
Another function called intersects allows you to test for circle-rectangle collisions:
boolean intersects(double x, double y, double w, double h)Tests if the interior of the
Shapeintersects the interior of a specified rectangular area.
Note that Ellipse2D is an abstract class; you would use one of its nested subclasses Ellipse2D.Double or Ellipse2D.Float, the only difference being the data type used to store the dimensions.
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There is an ellipse2D, this is in the same way that a square is a rectangle a circle is an ellipse.
http://docs.oracle.com/javase/7/docs/api/java/awt/geom/Ellipse2D.html
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