dll/drawstring.c

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/* {{{
 * CalcRogue, a roguelike game for PCs, calculators and PDAs
 * Copyright (C) 2003 Jim Babcock
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 * }}} */
// drawstring.c

#include "crogue.h"
#include "dll.h"

//{{{
static int StringWidth(const char *str)
{
    uint len=0;
    
    while(*str != '\0') {
        len += FontWidth(*str);
        str++;
    }
    
    return len;
}
//}}}

//{{{
void clear_string(int x, int y, int width, int height)
{
    Graph_ClearRect(x, y, x+width-1, y+height*FontHeight()-1);
}
//}}}

static int numTabStops = 1;
static uchar tabStops[16]={0};

//{{{
void setTabStops(int num, ...)
{
    va_list varargs;
    int i;
    numTabStops = num;
    
    va_start(varargs, num);
    for(i=0; i<num; i++)
        tabStops[i] = va_arg(varargs, int);
    va_end(varargs);
}
//}}}
//{{{
static int findTab(int pos)
{
    int i;
    for(i=0; i<numTabStops; i++)
    {
        if(tabStops[i] > pos)
            return tabStops[i];
    }
    return SCREEN_WIDTH * 2;
}
//}}}

/*
 * height=0 means no wrapping allowed; instead, clip the right edge (don't
 * pause, either)
 * Tab stops are given as distance from x, not from the left edge of the screen
 * Rows are in textual lines; width, x, and y are in pixels.
 */
//{{{
void draw_string(const char *string, draw_string_info *start_state, short x, short y, short width, short height, short wrap)
{
    int i, ii;
    int curX=0;
    int tempX;
    int curRow=0;
    int maxWidth;
    int rows = height/FontHeight();
    
    if(start_state)
    {
        curX = start_state->curX;
        curRow = start_state->curRow;
    }
    
    tempX = curX;
    
    i=0;
    
    while( string[i] != '\0' )
    {
        maxWidth = width;
        if( wrap && curRow+1 == rows )
            maxWidth -= StringWidth(gettext(" -More-"));
        
        if( string[i] == '\t' )
        {
            if(findTab(tempX) > maxWidth)
                goto startNewLine;
            else
                tempX = findTab(tempX);
        }
        else
        {
            tempX += FontWidth(string[i]);
        }
        
        // If past the end of the line
        if(tempX >= maxWidth || string[i] == '\n') {
startNewLine:
            if(!wrap)
                break;
            
            if(string[i] != '\n' && string[i] != '\t')
            {
                // Back up until (a) it fits and (b) it isn't in the middle of a word
                while(i >= 0 && string[i] != ' ' && tempX>0)
                    tempX -= FontWidth(string[i--]);
                if(tempX<=0) // Overshot; this line needs to be broken on a non-word-break
                {
                    while(tempX<=maxWidth)
                        tempX += FontWidth(string[++i]);
                    tempX -= FontWidth(string[--i]);
                }
            }
            
            // Print it out
            for(ii=0; ii<i; ii++) {
                if(string[ii]!='\t')
                    Graph_DrawChar(x+curX, y + curRow*FontHeight(), string[ii]);
                if(string[ii]=='\t')
                    curX = findTab(curX);
                else
                    curX += FontWidth(string[ii]);
            }
            
            // If out of lines, print the -More- prompt
            if( curRow+1 == rows ) {
                Graph_DrawStr(curX+x, curRow*FontHeight() + y, gettext(" -More-"));
                read_char();
                clear_string(x, y, width, rows);
                
                curRow = -1;
                curX = tempX = 0;
            }
            
            string += i;
            string++;
            
            i=0;
            
            curRow++;
            curX = tempX = 0;
        } else {
            i++;
        }
    }
    
    // Print the remainder
    for( i=0; string[i]!='\0'; i++ ) {
        if(string[i] == '\t')
        {
            curX = findTab(curX);
            continue;
        }
        Graph_DrawChar( x+curX, y + curRow*FontHeight(), string[i]);
        curX += FontWidth( string[i] );
    }
    
    if(start_state)
    {
        start_state->curX = curX;
        start_state->curRow = curRow;
    }
}
//}}}

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