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Diffstat (limited to 'examples/text/text_rectangle_bounds.c')
| -rw-r--r-- | examples/text/text_rectangle_bounds.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/examples/text/text_rectangle_bounds.c b/examples/text/text_rectangle_bounds.c index 9754cd45..c763fb2e 100644 --- a/examples/text/text_rectangle_bounds.c +++ b/examples/text/text_rectangle_bounds.c @@ -13,6 +13,10 @@ #include "raylib.h" +static void DrawTextRec(Font font, const char *text, Rectangle rec, float fontSize, float spacing, bool wordWrap, Color tint); // Draw text using font inside rectangle limits +static void DrawTextRecEx(Font font, const char *text, Rectangle rec, float fontSize, float spacing, bool wordWrap, Color tint, int selectStart, int selectLength, Color selectTint, Color selectBackTint); // Draw text using font inside rectangle limits with support for text selection + +// Main entry point int main(void) { // Initialization @@ -119,4 +123,144 @@ tempor incididunt ut labore et dolore magna aliqua. Nec ullamcorper sit amet ris //-------------------------------------------------------------------------------------- return 0; +} + +//-------------------------------------------------------------------------------------- +// Module functions definition +//-------------------------------------------------------------------------------------- + +// Draw text using font inside rectangle limits +static void DrawTextRec(Font font, const char *text, Rectangle rec, float fontSize, float spacing, bool wordWrap, Color tint) +{ + DrawTextRecEx(font, text, rec, fontSize, spacing, wordWrap, tint, 0, 0, WHITE, WHITE); +} + +// Draw text using font inside rectangle limits with support for text selection +static void DrawTextRecEx(Font font, const char *text, Rectangle rec, float fontSize, float spacing, bool wordWrap, Color tint, int selectStart, int selectLength, Color selectTint, Color selectBackTint) +{ + int length = TextLength(text); // Total length in bytes of the text, scanned by codepoints in loop + + float textOffsetY = 0; // Offset between lines (on line break '\n') + float textOffsetX = 0.0f; // Offset X to next character to draw + + float scaleFactor = fontSize/(float)font.baseSize; // Character rectangle scaling factor + + // Word/character wrapping mechanism variables + enum { MEASURE_STATE = 0, DRAW_STATE = 1 }; + int state = wordWrap? MEASURE_STATE : DRAW_STATE; + + int startLine = -1; // Index where to begin drawing (where a line begins) + int endLine = -1; // Index where to stop drawing (where a line ends) + int lastk = -1; // Holds last value of the character position + + for (int i = 0, k = 0; i < length; i++, k++) + { + // Get next codepoint from byte string and glyph index in font + int codepointByteCount = 0; + int codepoint = GetCodepoint(&text[i], &codepointByteCount); + int index = GetGlyphIndex(font, codepoint); + + // NOTE: Normally we exit the decoding sequence as soon as a bad byte is found (and return 0x3f) + // but we need to draw all of the bad bytes using the '?' symbol moving one byte + if (codepoint == 0x3f) codepointByteCount = 1; + i += (codepointByteCount - 1); + + float glyphWidth = 0; + if (codepoint != '\n') + { + glyphWidth = (font.chars[index].advanceX == 0) ? font.recs[index].width*scaleFactor : font.chars[index].advanceX*scaleFactor; + + if (i + 1 < length) glyphWidth = glyphWidth + spacing; + } + + // NOTE: When wordWrap is ON we first measure how much of the text we can draw before going outside of the rec container + // We store this info in startLine and endLine, then we change states, draw the text between those two variables + // and change states again and again recursively until the end of the text (or until we get outside of the container). + // When wordWrap is OFF we don't need the measure state so we go to the drawing state immediately + // and begin drawing on the next line before we can get outside the container. + if (state == MEASURE_STATE) + { + // TODO: There are multiple types of spaces in UNICODE, maybe it's a good idea to add support for more + // Ref: http://jkorpela.fi/chars/spaces.html + if ((codepoint == ' ') || (codepoint == '\t') || (codepoint == '\n')) endLine = i; + + if ((textOffsetX + glyphWidth) > rec.width) + { + endLine = (endLine < 1)? i : endLine; + if (i == endLine) endLine -= codepointByteCount; + if ((startLine + codepointByteCount) == endLine) endLine = (i - codepointByteCount); + + state = !state; + } + else if ((i + 1) == length) + { + endLine = i; + state = !state; + } + else if (codepoint == '\n') state = !state; + + if (state == DRAW_STATE) + { + textOffsetX = 0; + i = startLine; + glyphWidth = 0; + + // Save character position when we switch states + int tmp = lastk; + lastk = k - 1; + k = tmp; + } + } + else + { + if (codepoint == '\n') + { + if (!wordWrap) + { + textOffsetY += (font.baseSize + font.baseSize/2)*scaleFactor; + textOffsetX = 0; + } + } + else + { + if (!wordWrap && ((textOffsetX + glyphWidth) > rec.width)) + { + textOffsetY += (font.baseSize + font.baseSize/2)*scaleFactor; + textOffsetX = 0; + } + + // When text overflows rectangle height limit, just stop drawing + if ((textOffsetY + font.baseSize*scaleFactor) > rec.height) break; + + // Draw selection background + bool isGlyphSelected = false; + if ((selectStart >= 0) && (k >= selectStart) && (k < (selectStart + selectLength))) + { + DrawRectangleRec((Rectangle){ rec.x + textOffsetX - 1, rec.y + textOffsetY, glyphWidth, (float)font.baseSize*scaleFactor }, selectBackTint); + isGlyphSelected = true; + } + + // Draw current character glyph + if ((codepoint != ' ') && (codepoint != '\t')) + { + DrawTextCodepoint(font, codepoint, (Vector2){ rec.x + textOffsetX, rec.y + textOffsetY }, fontSize, isGlyphSelected? selectTint : tint); + } + } + + if (wordWrap && (i == endLine)) + { + textOffsetY += (font.baseSize + font.baseSize/2)*scaleFactor; + textOffsetX = 0; + startLine = endLine; + endLine = -1; + glyphWidth = 0; + selectStart += lastk - k; + k = lastk; + + state = !state; + } + } + + textOffsetX += glyphWidth; + } }
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