HGE:Tutorials:Rectangle Class

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hgeRect class

hgeRect is an HGE helper class for implementing rectangles. It is useful for collision detection.

hgeRect has 4 member variables: x1, y1, x2, y2

x1: The top-left corner X-coordinate.
y1: The top-left corner Y-coordinate.
x2: The bottom-right corner X-coordinate.
y2: The bottom-right corner Y-coordinate.
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Constructor:

hgeRect(float x1, float y1, float x2, float y2);

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Member functions:

TestPoint(float x, float y): Returns true if the specified point (x, y) is in the rectangle.

Intersect(hgeRect *r): Returns true if the specified rectangle (r) intersects the rectangle.

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Creating an hgeRect

Create an hgeRect instance in one of the following ways. They are all performing the same operation: setting the myRect's coordinates to (0, 0, 64, 64).

1. Use the constructor 

hgeRect myRect;
myRect = hgeRect(0, 0, 64, 64);

2. Single statement 

hgeRect myRect(0, 0, 64, 64);

3. Individually populating the member variables 

hgeRect myRect;
myRect.x1=0;
myRect.y1=0;
myRect.x2=64;
myRect.y2=64;

Next section: Simple 2D Game

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