void TerrainManager::EditLayerTerrain(Ogre::Terrain *terrain, const Ogre::Vector3 ¢erPos, float timeElapsed)
{
Ogre::Vector3 tsPos;
terrain->getTerrainPosition(centerPos, &tsPos);
Ogre::TerrainLayerBlendMap* layer = terrain->getLayerBlendMap(m_nLayerNum);
int d(terrain->getLayerBlendMapSize());
int t(terrain->getLayerCount());
// we need image coords
float imgSize = terrain->getLayerBlendMapSize();
long startx = (tsPos.x - m_fBrushSize) * imgSize;
long starty = (tsPos.y - m_fBrushSize) * imgSize;
long endx = (tsPos.x + m_fBrushSize) * imgSize;
long endy= (tsPos.y + m_fBrushSize) * imgSize;
startx = std::max(startx, 0L);
starty = std::max(starty, 0L);
endx = std::min(endx, (long)imgSize);
endy = std::min(endy, (long)imgSize);
for (long y = starty; y <= endy; ++y)
{
for (long x = startx; x <= endx; ++x)
{
float tsXdist = (x / imgSize) - tsPos.x;
float tsYdist = (y / imgSize) - tsPos.y;
float weight = std::min((float)1.0,
Ogre::Math::Sqrt(tsYdist * tsYdist + tsXdist * tsXdist) / float(0.5 * m_fBrushSize));
weight = 1.0 - (weight * weight);
float paint = weight * timeElapsed;
size_t imgY = imgSize - y;
float val = 0;
if(GetAsyncKeyState(VK_UP))
val = layer->getBlendValue(x, imgY) + paint;
else if(GetAsyncKeyState(VK_DOWN))
val = layer->getBlendValue(x, imgY) - paint;
val = Ogre::Math::Clamp(val, 0.0f, 1.0f);
layer->setBlendValue(x, imgY, val);
}
}
layer->update();
}
