108 lines
3.4 KiB
Go
108 lines
3.4 KiB
Go
/*******************************************************************************************
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*
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* raylib [text] example - Codepoints loading
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*
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* Example originally created with raylib 4.2, last time updated with raylib 2.5
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*
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
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* BSD-like license that allows static linking with closed source software
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*
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* Copyright (c) 2022-2024 Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/
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package main
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import (
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"fmt"
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rl "github.com/gen2brain/raylib-go/raylib"
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)
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const (
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screenWidth = 800
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screenHeight = 450
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)
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func main() {
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rl.InitWindow(screenWidth, screenHeight, "raylib [text] example - codepoints loading")
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// Text to be displayed, must be UTF-8 (save this code file as UTF-8)
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// NOTE: It can contain all the required text for the game,
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// this text will be scanned to get all the required codepoints
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text := "いろはにほへと ちりぬるを\nわかよたれそ つねならむ\nうゐのおくやま けふこえて\nあさきゆめみし ゑひもせす"
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// Get codepoints from text
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allCodepoints := []rune(text)
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// Removed duplicate codepoints to generate smaller font atlas
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codepoints := CodepointRemoveDuplicates(allCodepoints)
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codepointsCount := len(codepoints)
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// Load font containing all the provided codepoint glyphs
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// A texture font atlas is automatically generated
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font := rl.LoadFontEx("resources/DotGothic16-Regular.ttf", 36, codepoints, int32(codepointsCount))
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// Set bi-linear scale filter for better font scaling
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rl.SetTextureFilter(font.Texture, rl.FilterBilinear)
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// Set line spacing for multiline text (when line breaks are included '\n')
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rl.SetTextLineSpacing(20)
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showFontAtlas := false
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rl.SetTargetFPS(60) // Set our game to run at 60 frames-per-second
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// Main game loop
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for !rl.WindowShouldClose() { // Detect window close button or ESC key
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// Update
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if rl.IsKeyPressed(rl.KeySpace) {
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showFontAtlas = !showFontAtlas
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}
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// Draw
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rl.BeginDrawing()
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rl.ClearBackground(rl.RayWhite)
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rl.DrawRectangle(0, 0, screenWidth, 70, rl.Black)
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msg := fmt.Sprintf("Total codepoints contained in provided text: %d", len(allCodepoints))
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rl.DrawText(msg, 10, 10, 20, rl.Green)
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msg = fmt.Sprintf("Total codepoints required for font atlas (duplicates excluded): %d", codepointsCount)
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rl.DrawText(msg, 10, 40, 20, rl.Green)
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if showFontAtlas {
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// Draw generated font texture atlas containing provided codepoints
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rl.DrawTexture(font.Texture, 150, 100, rl.Black)
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rl.DrawRectangleLines(150, 100, font.Texture.Width, font.Texture.Height, rl.Black)
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} else {
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// Draw provided text with loaded font, containing all required codepoint glyphs
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pos := rl.Vector2{
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X: 160,
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Y: 110,
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}
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rl.DrawTextEx(font, text, pos, 48, 5, rl.Black)
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}
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msg = "Press SPACE to toggle font atlas view!"
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rl.DrawText(msg, 10, screenHeight-30, 20, rl.Gray)
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rl.EndDrawing()
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}
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// De-Initialization
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rl.UnloadFont(font) // Unload font
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rl.CloseWindow() // Close window and OpenGL context
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}
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// CodepointRemoveDuplicates removes codepoint duplicates if requested
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func CodepointRemoveDuplicates[T comparable](sliceList []T) []T {
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allKeys := make(map[T]bool)
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var list []T
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for _, item := range sliceList {
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if _, value := allKeys[item]; !value {
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allKeys[item] = true
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list = append(list, item)
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}
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}
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return list
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}
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