I’ve made a number of really nice enhancements to my earlier Radar demo.
- The original demo used collision_line() to detect when the radar sweep collided with the radar blips to refresh them. This meant that the collision detection could skip over smaller objects at great distances from the antenna, since the space between steps is not scanned. The new one uses an approach based on the angle difference between the mappable object and the sweep’s current and previous positions, and is therefore much more accurate.
- The original radar used a classic looking monochrome green radar screen. The new one implements IFF (Identify Friend or Foe) color coding. This system is flexible in that it allows you to change the value of the color variables used in the color key, or even a unique color if desired. oMappable child objects must have two instance variables, blip_alpha and blip_color. The demo only uses color for IFF, but for colorblind players it would be helpful to modify the routine to use shape as well as color to identify the blips.
- I’m particularly proud of how understandable and well-commented the code is, so if you’re a developer and want to modify it for your own needs, it should be quite easy to do so.
I still can’t get it to run in HTML5 builds, so a screen shot will have to do.