Reorganize code

game/camera.go

@@ -0,0 +1,55 @@
+package game
+
+import (
+	"math"
+
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+var (
+	cameraDistance = float32(20.0)
+	cameraYaw      = float32(145.0)
+	cameraPitch    = float32(45.0)
+)
+
+func UpdateCamera(camera *rl.Camera3D, player rl.Vector3, deltaTime float32) {
+	wheelMove := rl.GetMouseWheelMove()
+	if wheelMove != 0 {
+		cameraDistance += -wheelMove * 5
+		if cameraDistance < 10 {
+			cameraDistance = 10
+		}
+		if cameraDistance > 250 {
+			cameraDistance = 250
+		}
+	}
+
+	if rl.IsKeyDown(rl.KeyRight) {
+		cameraYaw += 100 * deltaTime
+	}
+	if rl.IsKeyDown(rl.KeyLeft) {
+		cameraYaw -= 100 * deltaTime
+	}
+	if rl.IsKeyDown(rl.KeyUp) {
+		cameraPitch -= 50 * deltaTime
+		if cameraPitch < 20 {
+			cameraPitch = 20
+		}
+	}
+	if rl.IsKeyDown(rl.KeyDown) {
+		cameraPitch += 50 * deltaTime
+		if cameraPitch > 85 {
+			cameraPitch = 85
+		}
+	}
+
+	cameraYawRad := float64(cameraYaw) * rl.Deg2rad
+	cameraPitchRad := float64(cameraPitch) * rl.Deg2rad
+
+	camera.Position = rl.Vector3{
+		X: player.X + cameraDistance*float32(math.Cos(cameraYawRad))*float32(math.Cos(cameraPitchRad)),
+		Y: player.Y + cameraDistance*float32(math.Sin(cameraPitchRad)),
+		Z: player.Z + cameraDistance*float32(math.Sin(cameraYawRad))*float32(math.Cos(cameraPitchRad)),
+	}
+	camera.Target = player
+}