doodle/render/sdl
Noah Petherbridge 5434484b6e Abstract Drawing Canvas into Reusable Widget
The `level.Canvas` is a widget that holds onto its Palette and Grid and
has interactions to allow scrolling and editing the grid using the
swatches available on the palette.

Thus all of the logic in the Editor Mode for drawing directly onto the
root SDL surface are now handled inside a level.Canvas instance.

The `level.Canvas` widget has the following properties:
* Like any widget it has an X,Y position and a width/height.
* It has a Scroll position to control which slice of its drawing will be
  visible inside its bounding box.
* It supports levels having negative coordinates for their pixels. It
  doesn't care. The default Scroll position is (0,0) at the top left
  corner of the widget but you can scroll into the negatives and see the
  negative pixels.
* Keyboard keys will scroll the viewport inside the canvas.
* The canvas draws only the pixels that are visible inside its bounding
  box.

This feature will eventually pave the way toward:
* Doodads being dropped on top of your map, each Doodad being its own
  Canvas widget.
* Using drawings as button icons for the user interface, as the Canvas
  is a normal widget.
2018-08-16 20:37:19 -07:00
..
canvas.go Abstract Drawing Canvas into Reusable Widget 2018-08-16 20:37:19 -07:00
fps.go Abstract away all SDL logic into isolated package 2018-07-21 17:12:22 -07:00
log.go Implement Developer Console with Initial Commands 2018-07-21 20:43:01 -07:00
sdl.go Menu Toolbar for Editor + Shell Prompts + Theme 2018-08-11 17:30:00 -07:00
text.go Menu Toolbar for Editor + Shell Prompts + Theme 2018-08-11 17:30:00 -07:00
utils.go Add ui.Supervisor for Widget Event Handling 2018-07-25 20:25:02 -07:00