Method CalcWordWrapPositionA

tutorials/common/imgui/imgui_draw.cpp:3348–3445

Simple word-wrapping for English, not full-featured. Please submit failing cases! This will return the next location to wrap from. If no wrapping if necessary, this will fast-forward to e.g. text_end. FIXME: Much possible improvements (don't cut things like "word !", "word!!!" but cut within "word,,,,", more sensible support for punctuations, support for Unicode punctuations, etc.)

// This will return the next location to wrap from. If no wrapping if necessary, this will fast-forward to e.g. text_end.
// FIXME: Much possible improvements (don't cut things like "word !", "word!!!" but cut within "word,,,,", more sensible support for punctuations, support for Unicode punctuations, etc.)
const char* ImFont::CalcWordWrapPositionA(float scale, const char* text, const char* text_end, float wrap_width) const
{
    // For references, possible wrap point marked with ^
    //  "aaa bbb, ccc,ddd. eee   fff. ggg!"
    //      ^    ^    ^   ^   ^__    ^    ^

    // List of hardcoded separators: .,;!?'"

    // Skip extra blanks after a line returns (that includes not counting them in width computation)
    // e.g. "Hello    world" --> "Hello" "World"

    // Cut words that cannot possibly fit within one line.
    // e.g.: "The tropical fish" with ~5 characters worth of width --> "The tr" "opical" "fish"
    float line_width = 0.0f;
    float word_width = 0.0f;
    float blank_width = 0.0f;
    wrap_width /= scale; // We work with unscaled widths to avoid scaling every characters

    const char* word_end = text;
    const char* prev_word_end = NULL;
    bool inside_word = true;

    const char* s = text;
    while (s < text_end)
    {
        unsigned int c = (unsigned int)*s;
        const char* next_s;
        if (c < 0x80)
            next_s = s + 1;
        else
            next_s = s + ImTextCharFromUtf8(&c, s, text_end);
        if (c == 0)
            break;

        if (c < 32)
        {
            if (c == '\n')
            {
                line_width = word_width = blank_width = 0.0f;
                inside_word = true;
                s = next_s;
                continue;
            }
            if (c == '\r')
            {
                s = next_s;
                continue;
            }
        }

        const float char_width = ((int)c < IndexAdvanceX.Size ? IndexAdvanceX.Data[c] : FallbackAdvanceX);
        if (ImCharIsBlankW(c))
        {
            if (inside_word)
            {
                line_width += blank_width;
                blank_width = 0.0f;
                word_end = s;