Readd core examples

examples/core/input_multitouch.zig

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+//
+// input_multitouch
+// Zig version: 
+// Author: Nikolas Wipper
+// Date: 2020-02-16
+//
+
+const rl = @import("raylib");
+
+pub fn main() anyerror!void
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const screenWidth = 800;
+    const screenHeight = 450;
+
+    rl.InitWindow(screenWidth, screenHeight, "raylib-zig [core] example - basic window");
+
+    var ballPosition = rl.Vector2 { .x = -100.0, .y = -100.0 };
+    var ballColor = rl.BEIGE;
+
+    var touchCounter: f32 = 0;
+    var touchPosition = rl.Vector2 { .x = 0.0, .y = 0.0 };
+
+    rl.SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!rl.WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        ballPosition = rl.GetMousePosition();
+
+        ballColor = rl.BEIGE;
+
+        if (rl.IsMouseButtonDown(rl.MouseButton.MOUSE_LEFT_BUTTON)) { ballColor = rl.MAROON; }
+        if (rl.IsMouseButtonDown(rl.MouseButton.MOUSE_MIDDLE_BUTTON)) { ballColor = rl.LIME; }
+        if (rl.IsMouseButtonDown(rl.MouseButton.MOUSE_RIGHT_BUTTON)) { ballColor = rl.DARKBLUE; }
+
+        if (rl.IsMouseButtonPressed(rl.MouseButton.MOUSE_LEFT_BUTTON)) { touchCounter = 10; }
+        if (rl.IsMouseButtonPressed(rl.MouseButton.MOUSE_MIDDLE_BUTTON)) { touchCounter = 10; }
+        if (rl.IsMouseButtonPressed(rl.MouseButton.MOUSE_RIGHT_BUTTON)) { touchCounter = 10; }
+
+        if (touchCounter > 0) { touchCounter -= 1; }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        rl.BeginDrawing();
+
+            rl.ClearBackground(rl.RAYWHITE);
+
+            const nums = [_]i32{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+            for (nums) |i|
+            {
+                touchPosition = rl.GetTouchPosition(i);                    // Get the touch point
+
+                if ((touchPosition.x >= 0) and (touchPosition.y >= 0))   // Make sure point is not (-1,-1) as this means there is no touch for it
+                {
+                    // Draw circle and touch index number
+                    rl.DrawCircle(@floatToInt(c_int, touchPosition.x), @floatToInt(c_int, touchPosition.y), 34, rl.ORANGE);
+                    //DrawCircleV(touchPosition, 34, ORANGE);
+                    rl.DrawText(rl.FormatText("%d", i), @floatToInt(c_int, touchPosition.x) - 10, @floatToInt(c_int, touchPosition.y) - 70, 40, rl.BLACK);
+                }
+            }
+
+            // Draw the normal mouse location
+            rl.DrawCircleV(ballPosition, 30 + (touchCounter*3), ballColor);
+
+            rl.DrawText("move ball with mouse and click mouse button to change color", 10, 10, 20, rl.DARKGRAY);
+            rl.DrawText("touch the screen at multiple locations to get multiple balls", 10, 30, 20, rl.DARKGRAY);
+
+        rl.EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    rl.CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+}
+