Hi guys, I’m currently working on a personal project. Basically, I have a Voronoi map and I plan to create a GUI: whenever the user clicks on a voronoi polygon, a window appears and show its informations (height, moisture, biome etc…).
In addition, I need the window to contain a “zoomed version” of the selected polygon with its neighbors.
The following screen represents what I have so far:
As you can see, I almost manage to do it. However, the set of polygon exceeds the black rectangle behind it.
My question is, how do I “limit” my polygons inside the black rectangle?
I’m using ControlP5 to generate my GUI, and the polygons+rectangle are drawing inside a CDrawable instance.
If I understand your question correctly, you’re asking how to clip the shape so it doesn’t go outside the black box, right?
If so, then you could draw the shape to a PGraphics instead of drawing it directly to your screen. This would allow you to set the dimensions you want to use. Then you’d draw that PGraphics to the screen. In fact, looking at your screenshot, it sounds like PGraphics could help you out quite a bit.
Anyway, the createGraphics() function is your friend. Take a look at the reference.
If so, then you could draw the shape to a PGraphics instead of drawing it directly to your screen. This would allow you to set the dimensions you want to use. Then you’d draw that PGraphics to the screen. In fact, looking at your screenshot, it sounds like PGraphics could help you out quite a bit.
I actually managed to do it manually before seing your solution…
I’m using Sutherland–Hodgman algorithm to clip my polygons, so I can draw them directly on the screen without going outside the black rectangle.
In the future, I’ll try to use PGraphics to make it easier.
Thank you!
…and, in addition to creating a PGraphics of the proper frame size and just drawing to it – which seems like what you want here – you could also create a larger PGraphics pg and call pg.clip()
