From bb8be2a13ec6642edb408cba728378056b65da71 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Tue, 11 Sep 2018 10:12:31 +0200
Subject: [PATCH] Add flyby

---
 demo3.cpp | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/demo3.cpp b/demo3.cpp
index faf0349..4469723 100644
--- a/demo3.cpp
+++ b/demo3.cpp
@@ -239,6 +239,8 @@ inline void pixelFunc(PixelInfo pixel)
   *buf = c;
 }
 
+bool flyBy = true;
+
 void draw()
 {
   RayConstraints c;
@@ -250,6 +252,44 @@ void draw()
   player.mCamera.height += player.mHeadBob;
   render(player.mCamera,floorHeightAt,0,colorAt,pixelFunc,c);
   player.mCamera.height -= player.mHeadBob;
+
+  if (flyBy && (pokitto.frameCount >> 3) % 3 != 0)
+  {
+    pokitto.display.setCursor(25,5);
+    pokitto.display.setColor(rgbToIndex(1,0,0));
+    pokitto.display.invisiblecolor = 0;
+    pokitto.display.print("press any key");
+  }
+}
+
+void cameraFlyBy(uint32_t dt)
+{
+  Unit height = floorHeightAt(
+    divRoundDown(player.mCamera.position.x,UNITS_PER_SQUARE),
+    divRoundDown(player.mCamera.position.y,UNITS_PER_SQUARE)) + UNITS_PER_SQUARE * 3;
+
+  Unit heightDiff = player.mCamera.height - height;
+
+  Unit step = (100 * dt) / 1000;
+
+  if (heightDiff > UNITS_PER_SQUARE * 2)
+  {
+    player.mCamera.height -= step * heightDiff / 200;
+    player.mCamera.shear = max(player.mCamera.shear - 1,-80);
+  }
+  else
+  {
+    if (heightDiff < UNITS_PER_SQUARE)
+      player.mCamera.height += step * absVal(heightDiff / 70);
+
+    if (player.mCamera.shear < 0 && pokitto.frameCount % 2 == 0)
+      player.mCamera.shear++;
+  }
+
+  player.mCamera.position.x += step * 30;
+  player.mCamera.position.y += step * 15;
+
+  player.mCamera.direction = sinInt(pokitto.frameCount / 4);
 }
 
 int main()
@@ -264,6 +304,7 @@ int main()
   squareColors[3] = rgbToIndex(4,4,0);
 
   player.setPositionSquare(4,5);
+  player.mCamera.height = floorHeightAt(4,5);
 
   // init changes
 
@@ -297,6 +338,18 @@ int main()
       dt = timeNow - previousTime;
       previousTime = timeNow;
 
+      if (flyBy)
+      {
+        cameraFlyBy(dt);
+
+        if (pokitto.aBtn() || pokitto.bBtn() || pokitto.cBtn() ||
+            pokitto.upBtn() || pokitto.downBtn() || pokitto.leftBtn() ||
+            pokitto.rightBtn())
+          flyBy = false;
+
+        continue;
+      }
+
       strafe = pokitto.aBtn();
 
       if (pokitto.cBtn())