This entry is part 3 of 6 in the Collision Detection and Reaction Session

Difficulty: Basix
Platform: Flash (Flash Player 10.1)
Language: AS3
Software used: FlashDevelop
Estimated Completion Time: 15 minutes

We covered collision detection between an infinite line and circle in our previous Quick Tip. However, the issue that arose was that the line extends further than the visible line segment; in fact, it extends into a hyperplane. In this Quick Tip, we shall limit our collision detection to that of a line segment only.

This entry is part 1 of 6 in the Collision Detection and Reaction Session

Collision detection is a branch of algorithms that checks whether two shapes overlap. If you build physics or action games with ActionScript, you will certainly not escape acquaintance with this topic. This is the first of the series regarding collision detection. In this Quick Tip, we shall look at ActionScript’s built-in collision detection method, hitTestObject(), and write our own to detect overlap between two circles.

This entry is part 2 of 6 in the Collision Detection and Reaction Session

Difficulty: Basix
Platform: Flash (Flash Player 10.1)
Language: AS3
Software used: FlashDevelop
Estimated Completion Time: 15 minutes

In my previous Quick Tip, we looked at the idea of collision detection in general, and specifically at detecting collisions between a pair of circles. In this Quick Tip, we’ll look at detecting a collision between a circle and a line.

Game development often requires being able to detect more information than just, “two objects are overlapping”. We need to know how much they are overlapping, where they are overlapping, and what types of objects they are.