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273 lines
11 KiB
273 lines
11 KiB
/*******************************************************************************************
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*
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* raylib [text] example - inline styling
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*
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* Example complexity rating: [★★★☆] 3/4
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*
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* Example originally created with raylib 5.6-dev, last time updated with raylib 5.6-dev
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*
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* Example contributed by Wagner Barongello (@SultansOfCode) and reviewed by Ramon Santamaria (@raysan5)
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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) 2025 Wagner Barongello (@SultansOfCode) and Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/
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#include "raylib.h"
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#include <stdlib.h> // Required for: strtoul(), NULL
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//----------------------------------------------------------------------------------
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// Module Functions Declaration
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//----------------------------------------------------------------------------------
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static void DrawTextStyled(Font font, const char *text, Vector2 position, float fontSize, float spacing, Color color);
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static Vector2 MeasureTextStyled(Font font, const char *text, float fontSize, float spacing);
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//------------------------------------------------------------------------------------
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// Program main entry point
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//------------------------------------------------------------------------------------
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int main(void)
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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const int screenWidth = 800;
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const int screenHeight = 450;
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InitWindow(screenWidth, screenHeight, "raylib [text] example - inline styling");
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Vector2 textSize = { 0 }; // Measure text box for provided font and text
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Color colRandom = RED; // Random color used on text
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int frameCounter = 0; // Used to generate a new random color every certain frames
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SetTargetFPS(60); // Set our game to run at 60 frames-per-second
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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// Update
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//----------------------------------------------------------------------------------
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frameCounter++;
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if ((frameCounter%20) == 0)
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{
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colRandom.r = (unsigned char)GetRandomValue(0, 255);
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colRandom.g = (unsigned char)GetRandomValue(0, 255);
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colRandom.b = (unsigned char)GetRandomValue(0, 255);
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colRandom.a = 255;
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}
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(RAYWHITE);
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// Text inline styling strategy used: [ ] delimiters for format
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// - Define foreground color: [cRRGGBBAA]
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// - Define background color: [bRRGGBBAA]
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// - Reset formating: [r]
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// Example: [bAA00AAFF][cFF0000FF]red text on gray background[r] normal text
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DrawTextStyled(GetFontDefault(), "This changes the [cFF0000FF]foreground color[r] of provided text!!!",
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(Vector2){ 100, 80 }, 20.0f, 2.0f, BLACK);
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DrawTextStyled(GetFontDefault(), "This changes the [bFF00FFFF]background color[r] of provided text!!!",
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(Vector2){ 100, 120 }, 20.0f, 2.0f, BLACK);
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DrawTextStyled(GetFontDefault(), "This changes the [c00ff00ff][bff0000ff]foreground and background colors[r]!!!",
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(Vector2){ 100, 160 }, 20.0f, 2.0f, BLACK);
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// Get pointer to formated text
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const char *text = TextFormat("Let's be [c%02x%02x%02xFF]CREATIVE[r] !!!", colRandom.r, colRandom.g, colRandom.b);
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DrawTextStyled(GetFontDefault(), text, (Vector2){ 100, 220 }, 40.0f, 2.0f, BLACK);
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textSize = MeasureTextStyled(GetFontDefault(), text, 40.0f, 2.0f);
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DrawRectangleLines(100, 220, textSize.x, textSize.y, GREEN);
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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//----------------------------------------------------------------------------------
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// Module Functions Definition
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//----------------------------------------------------------------------------------
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// Draw text using inline styling
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// PARAM: color is the default text color, background color is BLANK by default
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static void DrawTextStyled(Font font, const char *text, Vector2 position, float fontSize, float spacing, Color color)
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{
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// Text inline styling strategy used: [ ] delimiters for format
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// - Define foreground color: [cRRGGBBAA]
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// - Define background color: [bRRGGBBAA]
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// - Reset formating: [r]
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// Example: [bAA00AAFF][cFF0000FF]red text on gray background[r] normal text
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if (font.texture.id == 0) font = GetFontDefault();
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int textLen = TextLength(text);
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Color colFront = color;
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Color colBack = BLANK;
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int backRecPadding = 4; // Background rectangle padding
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float textOffsetY = 0.0f;
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float textOffsetX = 0.0f;
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float textLineSpacing = 0.0f;
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float scaleFactor = fontSize/font.baseSize;
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for (int i = 0; i < textLen;)
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{
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int codepointByteCount = 0;
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int codepoint = GetCodepointNext(&text[i], &codepointByteCount);
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if (codepoint == '\n')
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{
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textOffsetY += (fontSize + textLineSpacing);
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textOffsetX = 0.0f;
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}
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else
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{
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if (codepoint == '[') // Process pipe styling
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{
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if (((i + 2) < textLen) && (text[i + 1] == 'r') && (text[i + 2] == ']')) // Reset styling
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{
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colFront = color;
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colBack = BLANK;
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i += 3; // Skip "[r]"
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continue; // Do not draw characters
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}
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else if (((i + 1) < textLen) && ((text[i + 1] == 'c') || (text[i + 1] == 'b')))
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{
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i += 2; // Skip "[c" or "[b" to start parsing color
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// Parse following color
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char colHexText[9] = { 0 };
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char *textPtr = &text[i]; // Color should start here, let's see...
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int colHexCount = 0;
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while ((textPtr != NULL) && (textPtr[colHexCount] != '\0') && (textPtr[colHexCount] != ']'))
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{
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if (((textPtr[colHexCount] >= '0') && (textPtr[colHexCount] <= '9')) ||
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((textPtr[colHexCount] >= 'A') && (textPtr[colHexCount] <= 'F')) ||
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((textPtr[colHexCount] >= 'a') && (textPtr[colHexCount] <= 'f')))
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{
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colHexText[colHexCount] = textPtr[colHexCount];
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colHexCount++;
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}
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else break; // Only affects while loop
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}
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// Convert hex color text into actual Color
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unsigned int colHexValue = strtoul(colHexText, NULL, 16);
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if (text[i - 1] == 'c') colFront = GetColor(colHexValue);
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else if (text[i - 1] == 'b') colBack = GetColor(colHexValue);
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i += (colHexCount + 1); // Skip color value retrieved and ']'
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continue; // Do not draw characters
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}
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}
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int index = GetGlyphIndex(font, codepoint);
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float increaseX = 0.0f;
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if (font.glyphs[index].advanceX == 0) increaseX = ((float)font.recs[index].width*scaleFactor + spacing);
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else increaseX += ((float)font.glyphs[index].advanceX*scaleFactor + spacing);
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// Draw background rectangle color (if required)
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if (colBack.a > 0) DrawRectangle(position.x + textOffsetX, position.y + textOffsetY - backRecPadding, increaseX, fontSize + 2*backRecPadding, colBack);
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if ((codepoint != ' ') && (codepoint != '\t'))
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{
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DrawTextCodepoint(font, codepoint, (Vector2){ position.x + textOffsetX, position.y + textOffsetY }, fontSize, colFront);
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}
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textOffsetX += increaseX;
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}
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i += codepointByteCount;
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}
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}
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// Measure inline styled text
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// NOTE: Measuring styled text requires skipping styling data
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// WARNING: Not considering line breaks
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static Vector2 MeasureTextStyled(Font font, const char *text, float fontSize, float spacing)
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{
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Vector2 textSize = { 0 };
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if ((font.texture.id == 0) || (text == NULL) || (text[0] == '\0')) return textSize; // Security check
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int textLen = TextLength(text); // Get size in bytes of text
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float textLineSpacing = fontSize*1.5f;
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float textWidth = 0.0f;
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float textHeight = fontSize;
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float scaleFactor = fontSize/(float)font.baseSize;
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int codepoint = 0; // Current character
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int index = 0; // Index position in sprite font
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int validCodepointCounter = 0;
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for (int i = 0; i < textLen;)
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{
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int codepointByteCount = 0;
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codepoint = GetCodepointNext(&text[i], &codepointByteCount);
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if (codepoint == '[') // Ignore pipe inline styling
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{
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if (((i + 2) < textLen) && (text[i + 1] == 'r') && (text[i + 2] == ']')) // Reset styling
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{
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i += 3; // Skip "[r]"
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continue; // Do not measure characters
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}
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else if (((i + 1) < textLen) && ((text[i + 1] == 'c') || (text[i + 1] == 'b')))
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{
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i += 2; // Skip "[c" or "[b" to start parsing color
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char *textPtr = &text[i]; // Color should start here, let's see...
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int colHexCount = 0;
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while ((textPtr != NULL) && (textPtr[colHexCount] != '\0') && (textPtr[colHexCount] != ']'))
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{
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if (((textPtr[colHexCount] >= '0') && (textPtr[colHexCount] <= '9')) ||
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((textPtr[colHexCount] >= 'A') && (textPtr[colHexCount] <= 'F')) ||
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((textPtr[colHexCount] >= 'a') && (textPtr[colHexCount] <= 'f')))
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{
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colHexCount++;
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}
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else break; // Only affects while loop
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}
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i += (colHexCount + 1); // Skip color value retrieved and ']'
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continue; // Do not measure characters
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}
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}
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else if (codepoint != '\n')
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{
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index = GetGlyphIndex(font, codepoint);
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if (font.glyphs[index].advanceX > 0) textWidth += font.glyphs[index].advanceX;
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else textWidth += (font.recs[index].width + font.glyphs[index].offsetX);
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validCodepointCounter++;
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i += codepointByteCount;
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}
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}
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textSize.x = textWidth*scaleFactor + (validCodepointCounter - 1)*spacing;
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textSize.y = textHeight;
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return textSize;
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}
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