moved from h4570/tyra

src/samples/floors/camera.cpp

@@ -0,0 +1,82 @@
+/*
+# ______       ____   ___
+#   |     \/   ____| |___|    
+#   |     |   |   \  |   |       
+#-----------------------------------------------------------------------
+# Copyright 2020, tyra - https://github.com/h4570/tyra
+# Licenced under Apache License 2.0
+# Sandro Sobczyński <sandro.sobczynski@gmail.com>
+*/
+
+#include "camera.hpp"
+
+#include <utils/debug.hpp>
+#include <fastmath.h>
+
+const float CAMERA_Y = 30.0F;
+
+// ----
+// Constructors/Destructors
+// ----
+
+Camera::Camera(ScreenSettings *t_screen) : CameraBase(t_screen, &position, &up, &unitCirclePosition)
+{
+    PRINT_LOG("Initializing camera");
+    verticalLevel = 80.0F;
+    up.x = 0.0F;
+    up.y = 1.0F;
+    up.z = 0.0F;
+    PRINT_LOG("Camera initialized!");
+}
+
+Camera::~Camera() {}
+
+// ----
+// Methods
+// ----
+
+void Camera::update(Pad &t_pad, Mesh &t_mesh)
+{
+    rotate(t_pad);
+    followBy(t_mesh);
+    updatePlanes(t_mesh.position);
+    worldView.lookAt(up, position, t_mesh.position);
+}
+
+/** Set camera rotation by pad right joy and update unit circle
+ * https://en.wikipedia.org/wiki/Unit_circle
+ * https://www.desmos.com/calculator/3e7iypw4ow
+ */
+void Camera::rotate(Pad &t_pad)
+{
+    if (t_pad.rJoyH <= 50)
+        horizontalLevel -= 0.08;
+    else if (t_pad.rJoyH >= 200)
+        horizontalLevel += 0.04;
+    if (t_pad.rJoyV <= 50 && verticalLevel > 25.0F)
+        verticalLevel -= 0.9F;
+    else if (t_pad.rJoyV >= 200 && verticalLevel < 80.0F)
+        verticalLevel += 0.9F;
+    unitCirclePosition.x = (sin(horizontalLevel) * verticalLevel);
+    unitCirclePosition.y = CAMERA_Y;
+    unitCirclePosition.z = (cos(horizontalLevel) * verticalLevel);
+}
+
+/** Rotate camera around 3D object */
+void Camera::followBy(Mesh &t_mesh)
+{
+    position.x = unitCirclePosition.x + t_mesh.position.x;
+    position.y = unitCirclePosition.y + t_mesh.position.y;
+    position.z = unitCirclePosition.z + t_mesh.position.z;
+
+    if (position.x > (-0.04F * verticalLevel) &&
+        position.x < 0.0F &&
+        position.z > (0.998F * verticalLevel))
+    {
+        // TODO
+        // position.x = 0.0F;
+        // position.y = 0.0F;
+        // position.z = 0.0F;
+        // horizontalLevel = 0.0F;
+    }
+}