[examples] improve input_virtual_controls example (#4584)

examples/core/core_input_virtual_controls.c

@@ -6,7 +6,8 @@
 *
 *   Example create by GreenSnakeLinux (@GreenSnakeLinux),
 *   lighter by oblerion (@oblerion) and 
-*   reviewed by Ramon Santamaria (@raysan5)
+*   reviewed by Ramon Santamaria (@raysan5) and
+*   improved by danilwhale (@danilwhale)
 *
 *   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
 *   BSD-like license that allows static linking with closed source software
@@ -17,6 +18,16 @@
 
 #include "raylib.h"
 #include <math.h>
+
+typedef enum {
+    BUTTON_NONE = -1,
+    BUTTON_UP,
+    BUTTON_LEFT,
+    BUTTON_RIGHT,
+    BUTTON_DOWN,
+    BUTTON_MAX
+} PadButton;
+
 //------------------------------------------------------------------------------------
 // Program main entry point
 //------------------------------------------------------------------------------------
@@ -29,24 +40,38 @@ int main(void)
 
     InitWindow(screenWidth, screenHeight, "raylib [core] example - input virtual controls");
 
-    const float dpadX = 90;
-    const float dpadY = 300;
-    const float dpadRad = 25.0f;//radius of each pad
-    Color dpadColor = BLUE;
-    int dpadKeydown = -1;//-1 if not down, else 0,1,2,3 
+    Vector2 padPosition = { 100, 350 };
+    float buttonRadius = 30;
+
+    Vector2 buttonPositions[BUTTON_MAX] =
+    {
+        { padPosition.x,padPosition.y - buttonRadius*1.5f },  // Up
+        { padPosition.x - buttonRadius*1.5f, padPosition.y }, // Left
+        { padPosition.x + buttonRadius*1.5f, padPosition.y }, // Right
+        { padPosition.x, padPosition.y + buttonRadius*1.5f }  // Down
+    };
+
+    const char *buttonLabels[BUTTON_MAX] =
+    {
+        "Y",    // Up
+        "X",    // Left
+        "B",    // Right
+        "A"     // Down
+    };
 
-    
-    const float dpadCollider[4][2]= // collider array with x,y position
+    Color buttonLabelColors[BUTTON_MAX] =
     {
-        {dpadX,dpadY-dpadRad*1.5f},//up
-        {dpadX-dpadRad*1.5f,dpadY},//left
-        {dpadX+dpadRad*1.5f,dpadY},//right
-        {dpadX,dpadY+dpadRad*1.5f}//down
+        YELLOW, // Up
+        BLUE,   // Left
+        RED,    // Right
+        GREEN   // Down
     };
-    const char dpadLabel[4]="XYBA";//label of Dpad
 
-    float playerX=100;
-    float playerY=100;
+    int pressedButton = BUTTON_NONE;
+    Vector2 inputPosition = { 0, 0 };
+
+    Vector2 playerPosition = { (float)screenWidth/2, (float)screenHeight/2 };
+    float playerSpeed = 75;
 
     SetTargetFPS(60);
     //--------------------------------------------------------------------------------------
@@ -54,63 +79,89 @@ int main(void)
     // Main game loop
     while (!WindowShouldClose())    // Detect window close button or ESC key
     {
-    // Update 
-    //--------------------------------------------------------------------------
-        dpadKeydown = -1; //reset
-        int inputX = 0;
-        int inputY = 0;
-        if(GetTouchPointCount()>0)
-        {//use touch pos
-            inputX = GetTouchX();
-            inputY = GetTouchY();
+        // Update
+        //--------------------------------------------------------------------------
+        if ((GetTouchPointCount() > 0))
+        {
+            // Use touch position
+            inputPosition = GetTouchPosition(0);
         }
         else
-        {//use mouse pos
-            inputX = GetMouseX();
-            inputY = GetMouseY();
+        {
+            // Use mouse position
+            inputPosition = GetMousePosition();
         }
-        for(int i=0;i<4;i++)
+
+        // Reset pressed button to none
+        pressedButton = BUTTON_NONE;
+
+        // Make sure user is pressing left mouse button if they're from desktop
+        if ((GetTouchPointCount() > 0) || ((GetTouchPointCount() == 0) && IsMouseButtonDown(MOUSE_BUTTON_LEFT)))
         {
-            //test distance each collider and input < radius
-            if( fabsf(dpadCollider[i][1]-inputY) + fabsf(dpadCollider[i][0]-inputX) < dpadRad)
+            // Find nearest D-Pad button to the input position
+            for (int i = 0; i < BUTTON_MAX; i++)
             {
-                dpadKeydown = i;
-                break;
+                float distX = fabsf(buttonPositions[i].x - inputPosition.x);
+                float distY = fabsf(buttonPositions[i].y - inputPosition.y);
+
+                if ((distX + distY < buttonRadius))
+                {
+                    pressedButton = i;
+                    break;
+                }
             }
         }
-        // move player
-        switch(dpadKeydown){
-            case 0: playerY -= 50*GetFrameTime();
-            break;
-            case 1: playerX -= 50*GetFrameTime();
-            break;
-            case 2: playerX += 50*GetFrameTime();
-            break;
-            case 3: playerY += 50*GetFrameTime();
-            default:;
+
+        // Move player according to pressed button
+        switch (pressedButton)
+        {
+            case BUTTON_UP:
+            {
+                playerPosition.y -= playerSpeed*GetFrameTime();
+                break;
+            }
+            case BUTTON_LEFT:
+            {
+                playerPosition.x -= playerSpeed*GetFrameTime();
+                break;
+            }
+            case BUTTON_RIGHT:
+            {
+                playerPosition.x += playerSpeed*GetFrameTime();
+                break;
+            }
+            case BUTTON_DOWN:
+            {
+                playerPosition.y += playerSpeed*GetFrameTime();
+                break;
+            }
+            default: break;
         };
-    //--------------------------------------------------------------------------
-    // Draw 
-    //--------------------------------------------------------------------------
-       BeginDrawing();
+
+        //--------------------------------------------------------------------------
+        // Draw
+        //--------------------------------------------------------------------------
+        BeginDrawing();
+
             ClearBackground(RAYWHITE);
-            for(int i=0;i<4;i++)
+
+            // Draw world
+            DrawCircleV(playerPosition, 50, MAROON);
+
+            // Draw GUI
+            for (int i = 0; i < BUTTON_MAX; i++)
             {
-                //draw all pad
-                DrawCircleV((Vector2) { dpadCollider[i][0], dpadCollider[i][1] }, dpadRad, dpadColor);
-                if(i!=dpadKeydown)
-                {
-                    //draw label
-                    DrawText(TextSubtext(dpadLabel,i,1),
-                             (int)dpadCollider[i][0]-7,
-                             (int)dpadCollider[i][1]-8,20,BLACK);
-                }
+                DrawCircleV(buttonPositions[i], buttonRadius, (i == pressedButton)? DARKGRAY : BLACK);
+
+                DrawText(buttonLabels[i],
+                    (int)buttonPositions[i].x - 7, (int)buttonPositions[i].y - 8,
+                    20, buttonLabelColors[i]);
             }
 
-            DrawRectangleRec((Rectangle) { playerX - 4, playerY - 4, 75, 28 }, RED);
-            DrawText("Player", (int)playerX, (int)playerY, 20, WHITE);
+            DrawText("move the player with D-Pad buttons", 10, 10, 20, DARKGRAY);
+
         EndDrawing();
-    //--------------------------------------------------------------------------
+        //--------------------------------------------------------------------------
     }
 
     // De-Initialization