raylib-cs/ExampleApplication/Examples/textures/textures_image_drawing.cs

/*******************************************************************************************
*
*   raylib [textures] example - Image loading and drawing on it
*
*   NOTE: Images are loaded in CPU memory (RAM); textures are loaded in GPU memory (VRAM)
*
*   This example has been created using raylib 1.4 (www.raylib.com)
*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
*   Copyright (c) 2016 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

using Raylib;
using static Raylib.rl;

public partial class Examples
{
    public static int textures_image_drawing()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        int screenWidth = 800;
        int screenHeight = 450;

        InitWindow(screenWidth, screenHeight, "raylib [textures] example - image drawing");

        // NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)

        Image cat = LoadImage("resources/cat.png");             // Load image in CPU memory (RAM)
        ImageCrop(cat, new Rectangle(100, 10, 280, 380));      // Crop an image piece
        ImageFlipHorizontal(ref cat);                              // Flip cropped image horizontally
        ImageResize(ref cat, 150, 200);                            // Resize flipped-cropped image

        Image parrots = LoadImage("resources/parrots.png");     // Load image in CPU memory (RAM)

        // Draw one image over the other with a scaling of 1.5f
        ImageDraw(parrots, cat, new Rectangle(0, 0, cat.width, cat.height), new Rectangle(30, 40, cat.width * 1.5f, cat.height * 1.5f));
        ImageCrop(parrots, new Rectangle(0, 50, parrots.width, parrots.height - 100)); // Crop resulting image

        UnloadImage(cat);       // Unload image from RAM

        // Load custom font for frawing on image
        Font font = LoadFont("resources/custom_jupiter_crash.png");

        // Draw over image using custom font
        ImageDrawTextEx(parrots, new Vector2(300, 230), font, "PARROTS  CAT", font.baseSize, -2, WHITE);

        UnloadFont(font); // Unload custom spritefont (already drawn used on image)

        Texture2D texture = LoadTextureFromImage(parrots);      // Image converted to texture, uploaded to GPU memory (VRAM)
        UnloadImage(parrots);   // Once image has been converted to texture and uploaded to VRAM, it can be unloaded from RAM

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

        // Main game loop
        while (!WindowShouldClose())    // Detect window close button or ESC key
        {
            // Update
            //----------------------------------------------------------------------------------
            // TODO: Update your variables here
            //----------------------------------------------------------------------------------

            // Draw
            //----------------------------------------------------------------------------------
            BeginDrawing();

            ClearBackground(RAYWHITE);

            DrawTexture(texture, screenWidth / 2 - texture.width / 2, screenHeight / 2 - texture.height / 2 - 40, WHITE);
            DrawRectangleLines(screenWidth / 2 - texture.width / 2, screenHeight / 2 - texture.height / 2 - 40, texture.width, texture.height, DARKGRAY);

            DrawText("We are drawing only one texture from various images composed!", 240, 350, 10, DARKGRAY);
            DrawText("Source images have been cropped, scaled, flipped and copied one over the other.", 190, 370, 10, DARKGRAY);

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

        // De-Initialization
        //--------------------------------------------------------------------------------------
        UnloadTexture(texture);       // Texture unloading

        CloseWindow();                // Close window and OpenGL context
                                      //--------------------------------------------------------------------------------------

        return 0;
    }
}