Accepted Patch by Scraggy that moves text in such a way that no text overlaps

1 files changed, 179 insertions, 0 deletions

diff --git a/src/textmanager.cpp b/src/textmanager.cpp
new file mode 100644
index 00000000..b4135763
--- /dev/null
+++ b/src/textmanager.cpp
@@ -0,0 +1,179 @@
+/*
+ *  The Mana World
+ *  Copyright 2008 The Mana World Development Team
+ *
+ *  This file is part of The Mana World.
+ *
+ *  The Mana World 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.
+ *
+ *  The Mana World 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 The Mana World; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *  $Id$
+ */
+
+#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;
+    }
+}