This is a small collection of mostly game example source codes. These source codes are made available to help PlayBasic programmers kick start their game programming journey.
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This is an older code snippet that was originally written by Crystal Noir, it creates a type of 3D particle explosion using animated 2d sprites. I've tweaking the code and fixed some logic errors and this was the end result.
This example recreates a popular demo effect known as meta balls/blobs. The scene is calculated by working out the amount of energy that each pixel receives from the surround 'blobs' or lights. The more lights the more work each pixel has to be do.
So if you did all the work (calc the distance etc) in the inner most loops, you’d get a pretty heavy per pixel calculation. Such a loop would run slowly even in assembly/machine code. So what we need to do is come up with some ways we can simplify the inner loop to get the cost per pixel down as much as possible.
This example breaks away from the concept that depth is straight into the screen. In fact, Sprite Depth/ Scene Depth are just a sort order keys for the object. We can set the depth key to anything we like (0 to $ffff). Here i'm creating a scene where the sprites drawn vertically sorted upon their Y values.
To do this, we're using the sprites screen position on the Y axis, and inverting it for our depth value. We need to invert the value as the sorting engine draws things in highest to lowest. So smaller z values are drawn after higher ones.
What this means is that characters further down the screen (represented as some coloured ellipses) are drawn after characters above them. So foreground characters can appear to walk in front of other characters.
This example creates a layered infinitely scrollable star field using shapes. The star field can move/wrap in all 8 directions, much like you'd see in Asteroids arcade style games.. Here we're using Shapes to batch render dots, rather than trying to brute force them individually
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