Tilemap and "minus" scrollRect?

Haxe
#1

Is Tilemap supposed to work with scrollRect?
No matter what is scrolled to negative values - parent container or Tilemap itself - rendered tiles are always cropped to “0 and plus” area.

I hope I’m testing it correctly - I can draw using Graphics on negative area, but no Tile can be put there…

#2

Looks like the only way to achieve this is to:

  1. Use scrollRect on parent
  2. Use Matrix on Tilemap with translation (modified tx, ty)
#3

Could you share source for what we should change on BunnyMark to reproduce this?

#4

My goal was to be able to use negative x/y Tile values (or in other words to use 0,0 point that is not in the top-left corner of the Window).

So, in BunnyMark we (luckily) have minX, maxX, minY and maxY variables. Changing them in new() like this:

minX = -100;
maxX = stage.stageWidth - 100;
minY = -100;
maxY = stage.stageHeight - 100;

…and changing Tilemap like this:

tilemap.scrollRect = new openfl.geom.Rectangle(-100, -100, stage.stageWidth, stage.stageHeight);

…doesn’t work as one might expect - Tiles are cropped.

Is this intended for scrollRect to behave like this when used on Tilemap?

#5

Tilemap crops based on the width and height, almost like if the Tilemap was actually an animated bitmap. Perhaps this is what is causing the apparent cropping?

#6

So is it a bug or what? :wink:

#7

No, I think this is the expected behavior :slight_smile:

Tilemap works a bit like Bitmap, you would not expect this to work

bitmapData.setPixel (-100, -100, 0xFF0000);

BitmapData is valid between (0, 0) and (width, height), Tilemap is designed the same way :slight_smile:

#8

Thanks for clarifying @singmajesty!