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/*
* Support for non-overlapping floating text
* Copyright (C) 2008 Douglas Boffey <DougABoffey@netscape.net>
*
* This file is part of The Mana World.
*
* 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
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "textmanager.h"
#include <cstring>
#include "text.h"
TextManager *textManager = 0;
TextManager::TextManager()
{
}
void TextManager::addText(Text *text)
{
place(text, 0, text->mX, text->mY, text->mHeight);
mTextList.push_back(text);
}
void TextManager::moveText(Text *text, int x, int y)
{
text->mX = x;
text->mY = y;
place(text, text, text->mX, text->mY, text->mHeight);
}
void TextManager::removeText(const Text *text)
{
for (TextList::iterator ptr = mTextList.begin(),
pEnd = mTextList.end(); ptr != pEnd; ++ptr)
{
if (*ptr == text)
{
mTextList.erase(ptr);
return;
}
}
}
TextManager::~TextManager()
{
}
void TextManager::draw(Graphics *graphics, int xOff, int yOff)
{
for (TextList::iterator bPtr = mTextList.begin(), ePtr = mTextList.end();
bPtr != ePtr; ++bPtr)
{
(*bPtr)->draw(graphics, xOff, yOff);
}
}
void TextManager::place(const Text *textObj, const Text *omit,
int &x, int &y, int h)
{
int xLeft = textObj->mX;
int xRight = xLeft + textObj->mWidth - 1;
const int TEST = 100; // Number of lines to test for text
bool occupied[TEST]; // is some other text obscuring this line?
std::memset(&occupied, 0, sizeof(occupied)); // set all to false
int wantedTop = (TEST - h) / 2; // Entry in occupied at top of text
int occupiedTop = y - wantedTop; // Line in map representing to of occupied
for (TextList::const_iterator ptr = mTextList.begin(),
pEnd = mTextList.end(); ptr != pEnd; ++ptr)
{
if (*ptr != omit &&
(*ptr)->mX <= xRight &&
(*ptr)->mX + (*ptr)->mWidth > xLeft)
{
int from = (*ptr)->mY - occupiedTop;
int to = from + (*ptr)->mHeight - 1;
if (to < 0 || from >= TEST) // out of range considered
{
continue;
}
if (from < 0)
{
from = 0;
}
if (to >= TEST)
{
to = TEST - 1;
}
for (int i = from; i <= to; ++i)
{
occupied[i] = true;
}
}
}
bool ok = true;
for (int i = wantedTop; i < wantedTop + h; ++i)
{
ok = ok && !occupied[i];
}
if (ok)
{
return;
}
// Have to move it up or down, so find nearest spaces either side
int consec = 0;
int upSlot = -1; // means not found
for (int seek = wantedTop + h - 2; seek >= 0; --seek)
{
if (occupied[seek])
{
consec = 0;
}
else
{
if (++consec == h)
{
upSlot = seek;
break;
}
}
}
int downSlot = -1;
consec = 0;
for (int seek = wantedTop + 1; seek < TEST; ++seek)
{
if (occupied[seek])
{
consec = 0;
}
else
{
if (++consec == h)
{
downSlot = seek - h + 1;
break;
}
}
}
if (upSlot == -1 && downSlot == -1) // no good solution, so leave as is
{
return;
}
if (upSlot == -1) // must go down
{
y += downSlot - wantedTop;
return;
}
if (downSlot == -1) // must go up
{
y -= wantedTop - upSlot;
return;
}
if (wantedTop - upSlot > downSlot - wantedTop) // down is better
{
y += downSlot - wantedTop;
}
else
{
y -= wantedTop - upSlot;
}
}
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