From 501ef80bed15aff369b39712214169325fd5419b Mon Sep 17 00:00:00 2001
From: raysan5 <raysan5@gmail.com>
Date: Fri, 3 Jun 2016 13:22:24 +0200
Subject: [PATCH] Updated camera 2d example

---
 examples/core_2d_camera.c | 92 ++++++++++++++++++++++++++++++---------
 1 file changed, 71 insertions(+), 21 deletions(-)

diff --git a/examples/core_2d_camera.c b/examples/core_2d_camera.c
index 5e6b7c6c..73e1d65f 100644
--- a/examples/core_2d_camera.c
+++ b/examples/core_2d_camera.c
@@ -11,6 +11,8 @@
 
 #include "raylib.h"
 
+#define MAX_BUILDINGS   100
+
 int main()
 {
     // Initialization
@@ -20,16 +22,31 @@ int main()
 
     InitWindow(screenWidth, screenHeight, "raylib [core] example - 2d camera");
     
+    Rectangle player = { 400, 280, 40, 40 };
+    Rectangle buildings[MAX_BUILDINGS] = { 0, 0, 0, 0 };
+    Color buildColors[MAX_BUILDINGS] = { 80, 80, 80, 255 };
+    
+    int spacing = 0;
+    
+    for (int i = 0; i < MAX_BUILDINGS; i++)
+    {
+        buildings[i].width = GetRandomValue(50, 200);
+        buildings[i].height = GetRandomValue(100, 800);
+        buildings[i].y = screenHeight - 130 - buildings[i].height;
+        buildings[i].x = -6000 + spacing;
+
+        spacing += buildings[i].width;
+        
+        buildColors[i] = (Color){ GetRandomValue(200, 240), GetRandomValue(200, 240), GetRandomValue(200, 250), 255 };
+    }
+    
     Camera2D camera;
     
+    camera.target = (Vector2){ player.x + 20, player.y + 20 };
     camera.offset = (Vector2){ 0, 0 };
-    camera.target = (Vector2){ 400, 200 };
     camera.rotation = 0.0f;
     camera.zoom = 1.0f;
     
-    Rectangle player = { 400, 200, 40, 40 };
-    camera.target = (Vector2){ player.x + 20, player.y + 20 };
-    
     SetTargetFPS(60);
     //--------------------------------------------------------------------------------------
 
@@ -38,24 +55,36 @@ int main()
     {
         // Update
         //----------------------------------------------------------------------------------
-        if (IsKeyDown(KEY_RIGHT)) player.x -= 2;
-        else if (IsKeyDown(KEY_LEFT)) player.x += 2;
-        else if (IsKeyDown(KEY_UP)) player.y -= 2;
-        else if (IsKeyDown(KEY_DOWN)) player.y += 2;
+        if (IsKeyDown(KEY_RIGHT))
+        {
+            player.x += 2;              // Player movement
+            camera.offset.x -= 2;       // Camera displacement with player movement
+        }
+        else if (IsKeyDown(KEY_LEFT))
+        {
+            player.x -= 2;              // Player movement
+            camera.offset.x += 2;       // Camera displacement with player movement
+        }
         
         // Camera target follows player
         camera.target = (Vector2){ player.x + 20, player.y + 20 };
         
-        if (IsKeyDown(KEY_R)) camera.rotation--;
-        else if (IsKeyDown(KEY_F)) camera.rotation++;
+        // Camera rotation controls
+        if (IsKeyDown(KEY_A)) camera.rotation--;
+        else if (IsKeyDown(KEY_S)) camera.rotation++;
         
-        // Camera controls
-        if (IsKeyDown(KEY_R)) camera.rotation--;
-        else if (IsKeyDown(KEY_F)) camera.rotation++;
+        // Limit camera rotation to 80 degrees (-40 to 40)
+        if (camera.rotation > 40) camera.rotation = 40;         
+        else if (camera.rotation < -40) camera.rotation = -40;
         
+        // Camera zoom controls
         camera.zoom += ((float)GetMouseWheelMove()*0.05f);
         
-        if (IsKeyPressed(KEY_Z)) 
+        if (camera.zoom > 3.0f) camera.zoom = 3.0f;
+        else if (camera.zoom < 0.1f) camera.zoom = 0.1f;
+        
+        // Camera reset (zoom and rotation)
+        if (IsKeyPressed(KEY_R)) 
         {
             camera.zoom = 1.0f;
             camera.rotation = 0.0f;
@@ -64,17 +93,38 @@ int main()
 
         // Draw
         //----------------------------------------------------------------------------------
-        BeginDrawingEx(camera);
-
+        BeginDrawing();
+        
             ClearBackground(RAYWHITE);
+        
+            Begin2dMode(camera);
 
-            DrawText("2D CAMERA TEST", 20, 20, 20, GRAY);
+                DrawRectangle(-6000, 320, 13000, 8000, DARKGRAY);
+                
+                for (int i = 0; i < MAX_BUILDINGS; i++) DrawRectangleRec(buildings[i], buildColors[i]);
+                
+                DrawRectangleRec(player, RED);
+                
+                DrawRectangle(camera.target.x, -500, 1, screenHeight*4, GREEN);
+                DrawRectangle(-500, camera.target.y, screenWidth*4, 1, GREEN);
+                
+            End2dMode();
+            
+            DrawText("SCREEN AREA", 640, 10, 20, RED);
+            
+            DrawRectangle(0, 0, screenWidth, 5, RED);
+            DrawRectangle(0, 5, 5, screenHeight - 10, RED);
+            DrawRectangle(screenWidth - 5, 5, 5, screenHeight - 10, RED);
+            DrawRectangle(0, screenHeight - 5, screenWidth, 5, RED);
             
-            DrawRectangle(0, 300, screenWidth, 50, GRAY);
-            DrawRectangleRec(player, RED);
+            DrawRectangle( 10, 10, 250, 113, Fade(SKYBLUE, 0.5f));
+            DrawRectangleLines( 10, 10, 250, 113, BLUE);
             
-            DrawRectangle(camera.origin.x, 0, 1, screenHeight, GREEN);
-            DrawRectangle(0, camera.origin.y, screenWidth, 1, GREEN);
+            DrawText("Free 2d camera controls:", 20, 20, 10, BLACK);
+            DrawText("- Right/Left to move Offset", 40, 40, 10, DARKGRAY);
+            DrawText("- Mouse Wheel to Zoom in-out", 40, 60, 10, DARKGRAY);
+            DrawText("- A / S to Rotate", 40, 80, 10, DARKGRAY);
+            DrawText("- R to reset Zoom and Rotation", 40, 100, 10, DARKGRAY);
 
         EndDrawing();
         //----------------------------------------------------------------------------------