raylib-src/examples/textures/textures_image_text.c

/*******************************************************************************************
*
*   raylib [texture] example - Image text drawing using TTF generated spritefont
*
*   This example has been created using raylib 1.8 (www.raylib.com)
*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
*   Copyright (c) 2017 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

#include "raylib.h"

int main()
{
    // Initialization
    //--------------------------------------------------------------------------------------
    int screenWidth = 800;
    int screenHeight = 450;

    InitWindow(screenWidth, screenHeight, "raylib [texture] example - image text drawing");
    
    // TTF SpriteFont loading with custom generation parameters
    SpriteFont font = LoadSpriteFontEx("resources/KAISG.ttf", 64, 0, 0);
    
    Image parrots = LoadImage("resources/parrots.png"); // Load image in CPU memory (RAM)

    // Draw over image using custom font
    ImageDrawTextEx(&parrots, (Vector2){ 20, 20 }, font, "[Parrots font drawing]", font.baseSize, 0, WHITE);

    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
    
    Vector2 position = { screenWidth/2 - texture.width/2, screenHeight/2 - texture.height/2 - 20 };
    
    bool showFont = false;

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

    // Main game loop
    while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------
        if (IsKeyDown(KEY_SPACE)) showFont = true;
        else showFont = false;
        //----------------------------------------------------------------------------------

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

            ClearBackground(RAYWHITE);

            if (!showFont)
            {
                // Draw texture with text already drawn inside
                DrawTextureV(texture, position, WHITE);
                
                // Draw text directly using sprite font
                DrawTextEx(font, "[Parrots font drawing]", (Vector2){ position.x + 20, 
                           position.y + 20 + 280 }, font.baseSize, 0, WHITE);
            }
            else DrawTexture(font.texture, screenWidth/2 - font.texture.width/2, 50, BLACK);
            
            DrawText("PRESS SPACE to SEE USED SPRITEFONT ", 290, 420, 10, DARKGRAY);
        
        EndDrawing();
        //----------------------------------------------------------------------------------
    }

    // De-Initialization
    //--------------------------------------------------------------------------------------
    UnloadTexture(texture);     // Texture unloading
        
    UnloadSpriteFont(font);     // Unload custom spritefont
    
    CloseWindow();              // Close window and OpenGL context
    //--------------------------------------------------------------------------------------

    return 0;
}