actual camera code this time

1 files changed, 41 insertions, 0 deletions

diff --git a/src/camera.lua b/src/camera.lua
new file mode 100644
index 0000000..a328099
--- /dev/null
+++ b/src/camera.lua
@@ -0,0 +1,41 @@
+local DEFAULT_CAMERA_SMOOTHING = 30
+
+Cam = {}
+Cam.__index = Cam
+
+function Cam.new(x, y)
+  local self = setmetatable({}, Cam)
+
+  self.x = x or 0
+  self.y = y or 0
+  self.realx = self.x
+  self.realy = self.y
+  self.zoom = 2
+
+  self.smoothing = DEFAULT_CAMERA_SMOOTHING
+
+  return self
+end
+
+function Cam:update(dt)
+  self.realx = dlerp(self.realx, self.x, self.smoothing * dt)
+  self.realy = dlerp(self.realy, self.y, self.smoothing * dt)
+end
+
+local active_cam = Cam.new()
+
+function get_active_camera()
+  return active_cam
+end
+
+function set_active_camera(new_cam)
+  active_cam = new_cam
+end
+
+function use_camera_transform()
+  local w, h = SCR_WIDTH / 2, SCR_HEIGHT / 2
+  lg.scale(active_cam.zoom)
+  lg.translate(
+    -active_cam.realx + w / active_cam.zoom,
+    -active_cam.realy + h / active_cam.zoom)
+end