raylib-cs/Examples/Shapes/RectangleScaling.cs

/*******************************************************************************************
*
*   raylib [shapes] example - rectangle scaling by mouse
*
*   This example has been created using raylib 2.5 (www.raylib.com)
*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
*   Example contributed by Vlad Adrian (@demizdor) and reviewed by Ramon Santamaria (@raysan5)
*
*   Copyright (c) 2018 Vlad Adrian (@demizdor) and Ramon Santamaria (@raysan5)
*
********************************************************************************************/

using System.Numerics;
using static Raylib_cs.Raylib;

namespace Examples.Shapes;

public class RectangleScaling
{
    public const int MOUSE_SCALE_MARK_SIZE = 12;

    public static int Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        const int screenWidth = 800;
        const int screenHeight = 450;

        InitWindow(screenWidth, screenHeight, "raylib [shapes] example - rectangle scaling mouse");

        Rectangle rec = new(100, 100, 200, 80);
        Vector2 mousePosition = new(0, 0);

        bool mouseScaleReady = false;
        bool mouseScaleMode = false;

        SetTargetFPS(60);
        //--------------------------------------------------------------------------------------

        // Main game loop
        while (!WindowShouldClose())
        {
            // Update
            //----------------------------------------------------------------------------------
            mousePosition = GetMousePosition();

            Rectangle area = new(
                rec.X + rec.Width - MOUSE_SCALE_MARK_SIZE,
                rec.Y + rec.Height - MOUSE_SCALE_MARK_SIZE,
                MOUSE_SCALE_MARK_SIZE,
                MOUSE_SCALE_MARK_SIZE
            );

            if (CheckCollisionPointRec(mousePosition, rec) &&
                CheckCollisionPointRec(mousePosition, area))
            {
                mouseScaleReady = true;
                if (IsMouseButtonPressed(MouseButton.MOUSE_LEFT_BUTTON))
                {
                    mouseScaleMode = true;
                }
            }
            else
            {
                mouseScaleReady = false;
            }

            if (mouseScaleMode)
            {
                mouseScaleReady = true;

                rec.Width = (mousePosition.X - rec.X);
                rec.Height = (mousePosition.Y - rec.Y);

                if (rec.Width < MOUSE_SCALE_MARK_SIZE)
                {
                    rec.Width = MOUSE_SCALE_MARK_SIZE;
                }
                if (rec.Height < MOUSE_SCALE_MARK_SIZE)
                {
                    rec.Height = MOUSE_SCALE_MARK_SIZE;
                }

                if (IsMouseButtonReleased(MouseButton.MOUSE_LEFT_BUTTON))
                {
                    mouseScaleMode = false;
                }
            }
            //----------------------------------------------------------------------------------

            // Draw
            //----------------------------------------------------------------------------------
            BeginDrawing();
            ClearBackground(Color.RAYWHITE);

            DrawText("Scale rectangle dragging from bottom-right corner!", 10, 10, 20, Color.GRAY);
            DrawRectangleRec(rec, ColorAlpha(Color.GREEN, 0.5f));

            if (mouseScaleReady)
            {
                DrawRectangleLinesEx(rec, 1, Color.RED);
                DrawTriangle(
                    new Vector2(rec.X + rec.Width - MOUSE_SCALE_MARK_SIZE, rec.Y + rec.Height),
                    new Vector2(rec.X + rec.Width, rec.Y + rec.Height),
                    new Vector2(rec.X + rec.Width, rec.Y + rec.Height - MOUSE_SCALE_MARK_SIZE),
                    Color.RED
                );
            }

            EndDrawing();
            //----------------------------------------------------------------------------------
        }

        // De-Initialization
        //--------------------------------------------------------------------------------------
        CloseWindow();
        //--------------------------------------------------------------------------------------

        return 0;
    }
}