code / tomo-lost-signal

   1 # A camera module that wraps around raylib's built-in Camera2D
   2 use random
   3 use ./raylib.tm
   4 
   5 struct Camera(
   6     pos=Vector2(0,0),
   7     target=Vector2(0,0),
   8     forward=Vector2(1,0),
   9     anchor=Vector2(0.5, 0.5),
  10     rotation=Num32(0.0),
  11     zoom=Num32(1.0),
  12     shake=Num32(0.0),
  13 )
  14     func begin_drawing(c:Camera)
  15         pos := c.pos
  16         if c.shake > Num32(1.0)
  17             pos += Vector2(c.shake, 0).rotated(random.num32(0, Num32.TAU))
  18 
  19         BeginMode2D(Camera2D(
  20             target=c.pos,
  21             offset=Vector2(c.anchor.x * Num32(GetScreenWidth()), c.anchor.y * Num32(GetScreenHeight())),
  22             rotation=c.rotation,
  23             zoom=c.zoom,
  24         ))
  25 
  26     func draw(c:Camera)
  27         DrawCircleV(c.target, 10, Color(0xff,0,0))
  28         len := (Num32(50.)*(Num32(1.) _min_ c.forward.length()))
  29         DrawCircleV(c.target + len*c.forward.norm(), 10, Color(0xff,0xff,0,0x80))
  30 
  31     func end_drawing(c:Camera)
  32         EndMode2D()
  33 
  34     func update(c:&Camera, dt:Num32)
  35         len := (Num32(50.)*(Num32(1.) _min_ c.forward.length()))
  36         c.pos = c.pos.mix(c.target + len*c.forward.norm(), 0.9)
  37         c.shake -= dt*Num32(2.0)
  38 
  39     func add_shake(c:&Camera, amount:Num32)
  40         c.shake = (c.shake.exp() + amount).log() or Num32(0)
  41 
  42     func follow(c:&Camera, pos:Vector2)
  43         if not pos.dist(c.target).near(0, 1e-2, 1e-2)
  44             c.forward = c.forward.mix((pos - c.target).norm(), .05)
  45             c.target = pos