环境
- Time 2024-03-06
- Zig 0.12.0-dev.3152+90c1a2c41
- WSL-Ubuntu 22.04.3 LTS
- Raylib 5.0
前言
说明
参考资料：
- https://www.raylib.com/examples.html
目标
显示非英文字符，并且将重复的字符去除。
main.zig
const std = @import("std");
const ray = @import("raylib.zig");pub fn main() !void {const screenWidth: c_int = 800;const screenHeight: c_int = 450;ray.InitWindow(screenWidth, screenHeight, "raylib [text] example");defer ray.CloseWindow();ray.SetTargetFPS(60);const 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";// Get codepoints from textvar count: c_int = 0;const loadedCodepoints = ray.LoadCodepoints(text, &count);const codepoints: []c_int = loadedCodepoints[0..@intCast(count)];// Removed duplicate codepoints to generate smaller font atlasconst allocator = std.heap.c_allocator;const codes = try removeDuplicates(allocator, codepoints);allocator.free(codes);ray.UnloadCodepoints(loadedCodepoints);// Load font containing all the provided codepoint glyphs// A texture font atlas is automatically generatedconst font = ray.LoadFontEx("res/DotGothic16-Regular.ttf", 48, loadedCodepoints, count);// Set bilinear scale filter for better font scalingray.SetTextureFilter(font.texture, ray.TEXTURE_FILTER_BILINEAR);ray.SetTextLineSpacing(54); // Set line spacing for multiline text (when line breaks are included '\n')// Free codepoints, atlas has already been generatedvar showFontAtlas = false;var codepointSize: c_int = 0;var ptr = @intFromPtr(text);while (!ray.WindowShouldClose()) {// Updateif (ray.IsKeyPressed(ray.KEY_SPACE)) showFontAtlas = !showFontAtlas;// Testing code: getting next and previous codepoints on provided textif (ray.IsKeyPressed(ray.KEY_RIGHT)) {// Get next codepoint in string and move pointer_ = ray.GetCodepointNext(ptr, &codepointSize);ptr += @intCast(codepointSize);} else if (ray.IsKeyPressed(ray.KEY_LEFT)) {// Get previous codepoint in string and move pointer_ = ray.GetCodepointPrevious(ptr, &codepointSize);ptr -= @intCast(codepointSize);}// Drawray.BeginDrawing();defer ray.EndDrawing();ray.ClearBackground(ray.RAYWHITE);ray.DrawRectangle(0, 0, ray.GetScreenWidth(), 70, ray.BLACK);ray.DrawText(ray.TextFormat("Total codepoints contained in provided text: %i", count), 10, 10, 20, ray.GREEN);ray.DrawText(ray.TextFormat("Total codepoints required for font atlas (duplicates excluded): %i", codes.len), 10, 40, 20, ray.GREEN);if (showFontAtlas) {// Draw generated font texture atlas containing provided codepointsray.DrawTexture(font.texture, 150, 100, ray.BLACK);ray.DrawRectangleLines(150, 100, font.texture.width, font.texture.height, ray.BLACK);} else {// Draw provided text with laoded font, containing all required codepoint glyphsray.DrawTextEx(font, text, .{ .x = 160, .y = 110 }, 48, 5, ray.BLACK);}ray.DrawText("Press SPACE to toggle font atlas view!", 10, ray.GetScreenHeight() - 30, 20, ray.GRAY);ray.DrawFPS(screenWidth - 100, 10);}
}// Remove codepoint duplicates if requested
// WARNING: This process could be a bit slow if there text to process is very long
fn removeDuplicates(allocator: std.mem.Allocator, codepoints: []c_int) ![]c_int {var codepointsNoDupsCount = codepoints.len;var codepointsNoDups = try allocator.alloc(c_int, codepoints.len);@memcpy(codepointsNoDups, codepoints);// Remove duplicatesfor (0..codepointsNoDupsCount) |i| {var j = i + 1;while (j < codepointsNoDupsCount) : (j += 1) {if (codepointsNoDups[i] == codepointsNoDups[j]) {for (j..codepointsNoDupsCount - 1) |k|codepointsNoDups[k] = codepointsNoDups[k + 1];codepointsNoDupsCount -= 1;j -= 1;}}}// NOTE: The size of codepointsNoDups is the same as original array but// only required positions are filled (codepointsNoDupsCount)return codepointsNoDups[0..codepointsNoDupsCount];
}
效果
总结
显示非英文字符，并且将重复的字符去除。