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Examples/Text/UnicodeRanges.cs Normal file
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/*******************************************************************************************
*
* raylib [text] example - unicode ranges
*
* Example complexity rating: [★★★★] 4/4
*
* Example originally created with raylib 5.5, last time updated with raylib 5.6
*
* Example contributed by Vadim Gunko (@GuvaCode) and reviewed by Ramon Santamaria (@raysan5)
*
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
* BSD-like license that allows static linking with closed source software
*
* Copyright (c) 2025 Vadim Gunko (@GuvaCode) and Ramon Santamaria (@raysan5)
*
********************************************************************************************/
using System.Numerics;
using Raylib_cs;
using static Raylib_cs.Raylib;
namespace Examples.Text;
public partial class UnicodeRanges : IExample
{
private const int screenWidth = 800;
private const int screenHeight = 450;
// path differs from upstream: font lives under resources/fonts/
private const string FontPath = "resources/fonts/NotoSansTC-Regular.ttf";
public string Name => "Text / Unicode Ranges";
public string Title => "raylib [text] example - unicode ranges";
private Font font;
private int unicodeRange; // Track the ranges of codepoints added to font
private int prevUnicodeRange; // Previous Unicode range to avoid reloading every frame
public void Init()
{
// Load font with default Unicode range: Basic ASCII [32-127]
font = LoadFont(FontPath);
SetTextureFilter(font.Texture, TextureFilter.Bilinear);
unicodeRange = 0;
prevUnicodeRange = 0;
}
public void Update()
{
// Update
//----------------------------------------------------------------------------------
if (unicodeRange != prevUnicodeRange)
{
UnloadFont(font);
// Load font with default Unicode range: Basic ASCII [32-127]
font = LoadFont(FontPath);
// Add required ranges to loaded font
// NOTE: The upstream switch uses fall-through so range N also loads all lower
// ranges, in the same order (4 -> 3 -> 2 -> 1); the descending if-chain preserves that.
/*
if (unicodeRange >= 5)
{
// Unicode range: Devanari, Arabic, Hebrew
// WARNING: Glyphs not available on provided font!
AddCodepointRange(ref font, FontPath, 0x900, 0x97f); // Devanagari
AddCodepointRange(ref font, FontPath, 0x600, 0x6ff); // Arabic
AddCodepointRange(ref font, FontPath, 0x5d0, 0x5ea); // Hebrew
}
*/
if (unicodeRange >= 4)
{
// Unicode range: CJK (Japanese and Chinese)
// WARNING: Loading thousands of codepoints requires lot of time!
// A better strategy is prefilter the required codepoints for the text
// in the game and just load the required ones
AddCodepointRange(ref font, FontPath, 0x4e00, 0x9fff);
AddCodepointRange(ref font, FontPath, 0x3400, 0x4dbf);
AddCodepointRange(ref font, FontPath, 0x3000, 0x303f);
AddCodepointRange(ref font, FontPath, 0x3040, 0x309f);
AddCodepointRange(ref font, FontPath, 0x30A0, 0x30ff);
AddCodepointRange(ref font, FontPath, 0x31f0, 0x31ff);
AddCodepointRange(ref font, FontPath, 0xff00, 0xffef);
AddCodepointRange(ref font, FontPath, 0xac00, 0xd7af);
AddCodepointRange(ref font, FontPath, 0x1100, 0x11ff);
}
if (unicodeRange >= 3)
{
// Unicode range: Cyrillic
AddCodepointRange(ref font, FontPath, 0x400, 0x4ff);
AddCodepointRange(ref font, FontPath, 0x500, 0x52f);
AddCodepointRange(ref font, FontPath, 0x2de0, 0x2Dff);
AddCodepointRange(ref font, FontPath, 0xa640, 0xA69f);
}
if (unicodeRange >= 2)
{
// Unicode range: Greek
AddCodepointRange(ref font, FontPath, 0x370, 0x3ff);
AddCodepointRange(ref font, FontPath, 0x1f00, 0x1fff);
}
if (unicodeRange >= 1)
{
// Unicode range: European Languages
AddCodepointRange(ref font, FontPath, 0xc0, 0x17f);
AddCodepointRange(ref font, FontPath, 0x180, 0x24f);
//AddCodepointRange(ref font, FontPath, 0x1e00, 0x1eff);
//AddCodepointRange(ref font, FontPath, 0x2c60, 0x2c7f);
}
prevUnicodeRange = unicodeRange;
SetTextureFilter(font.Texture, TextureFilter.Bilinear); // Set font atlas scale filter
}
if (IsKeyPressed(KeyboardKey.Zero)) unicodeRange = 0;
else if (IsKeyPressed(KeyboardKey.One)) unicodeRange = 1;
else if (IsKeyPressed(KeyboardKey.Two)) unicodeRange = 2;
else if (IsKeyPressed(KeyboardKey.Three)) unicodeRange = 3;
else if (IsKeyPressed(KeyboardKey.Four)) unicodeRange = 4;
//else if (IsKeyPressed(KeyboardKey.Five)) unicodeRange = 5;
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(Color.RayWhite);
DrawText("ADD CODEPOINTS: [1][2][3][4]", 20, 20, 20, Color.Maroon);
// Render test strings in different languages
DrawTextEx(font, "> English: Hello World!", new Vector2(50, 70), 32, 1, Color.DarkGray); // English
DrawTextEx(font, "> Español: Hola mundo!", new Vector2(50, 120), 32, 1, Color.DarkGray); // Spanish
DrawTextEx(font, "> Ελληνικά: Γειά σου κόσμε!", new Vector2(50, 170), 32, 1, Color.DarkGray); // Greek
DrawTextEx(font, "> Русский: Привет мир!", new Vector2(50, 220), 32, 0, Color.DarkGray); // Russian
DrawTextEx(font, "> 中文: 你好世界!", new Vector2(50, 270), 32, 1, Color.DarkGray); // Chinese
DrawTextEx(font, "> 日本語: こんにちは世界!", new Vector2(50, 320), 32, 1, Color.DarkGray); // Japanese
//DrawTextEx(font, "देवनागरी: होला मुंडो!", new Vector2(50, 350), 32, 1, Color.DarkGray); // Devanagari (glyphs not available in font)
// Draw font texture scaled to screen
float atlasScale = 380.0f / font.Texture.Width;
DrawRectangleRec(new Rectangle(400.0f, 16.0f, font.Texture.Width * atlasScale, font.Texture.Height * atlasScale), Color.Black);
DrawTexturePro(font.Texture, new Rectangle(0, 0, font.Texture.Width, font.Texture.Height),
new Rectangle(400.0f, 16.0f, font.Texture.Width * atlasScale, font.Texture.Height * atlasScale), new Vector2(0, 0), 0.0f, Color.White);
DrawRectangleLines(400, 16, 380, 380, Color.Red);
DrawText($"ATLAS SIZE: {font.Texture.Width}x{font.Texture.Height} px (x{atlasScale:00.00})", 20, 380, 20, Color.Blue);
DrawText($"CODEPOINTS GLYPHS LOADED: {font.GlyphCount}", 20, 410, 20, Color.Lime);
// Display font attribution
DrawText("Font: Noto Sans TC. License: SIL Open Font License 1.1", screenWidth - 300, screenHeight - 20, 10, Color.Gray);
if (prevUnicodeRange != unicodeRange)
{
DrawRectangle(0, 0, screenWidth, screenHeight, Fade(Color.White, 0.8f));
DrawRectangle(0, 125, screenWidth, 200, Color.Gray);
DrawText("GENERATING FONT ATLAS...", 120, 210, 40, Color.Black);
}
EndDrawing();
//----------------------------------------------------------------------------------
}
public void Unload()
{
UnloadFont(font); // Unload font resource
}
//--------------------------------------------------------------------------------------
// Module Functions Definition
//--------------------------------------------------------------------------------------
// Add codepoint range to existing font
private static unsafe void AddCodepointRange(ref Font font, string fontPath, int start, int stop)
{
int rangeSize = stop - start + 1;
int currentRangeSize = font.GlyphCount;
// TODO: Load glyphs from provided vector font (if available),
// add them to existing font, regenerating font image and texture
int updatedCodepointCount = currentRangeSize + rangeSize;
int[] updatedCodepoints = new int[updatedCodepointCount];
// Get current codepoint list
for (int i = 0; i < currentRangeSize; i++) updatedCodepoints[i] = font.Glyphs[i].Value;
// Add new codepoints to list (provided range)
for (int i = currentRangeSize; i < updatedCodepointCount; i++)
updatedCodepoints[i] = start + (i - currentRangeSize);
UnloadFont(font);
font = LoadFontEx(fontPath, 32, updatedCodepoints, updatedCodepointCount);
}
public static int Main()
{
// Initialization
//--------------------------------------------------------------------------------------
InitWindow(screenWidth, screenHeight, "raylib [text] example - unicode ranges");
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
var game = new UnicodeRanges();
game.Init();
// Main loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
game.Update();
}
game.Unload();
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
}