matthew/The-Powder-Toy
Archived
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

faster ellipse brush resizing that doesn't lag/freeze

Browse Source
This commit is contained in:
jacob1 2013-01-04 14:18:01 -05:00
parent bdf0cc41c5
commit bce28b83b8
1 changed files with 26 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
src/game/EllipseBrush.h
View File

@ -26,17 +26,35 @@ public:
bitmap = new unsigned char[size.X*size.Y];
int rx = radius.X;
int ry = radius.Y;
for(int x = 0; x <= radius.X*2; x++)
if (!rx)
{
for(int y = 0; y <= radius.Y*2; y++)
for (int j = 0; j <= 2*ry; j++)
{
if((pow(x-radius.X,2.0f)*pow(ry,2.0f)+pow(y-radius.Y,2.0f)*pow(rx,2.0f)<=pow(rx,2.0f)*pow(ry,2.0f)))
bitmap[j*(size.X)+rx] = 255;
}
}
else
{
int yTop = ry, i, j, yBottom;
for (i = 0; i <= rx; i++)
{
while (pow(i-rx,2.0f)*pow(ry,2.0f) + pow(yTop-ry,2.0f)*pow(rx,2.0f) <= pow(rx,2.0f)*pow(ry,2.0f))
yTop = yTop + 1;
yTop = yTop - 1;
yBottom = 2*ry - yTop;
for (int j = 0; j <= ry*2; j++)
{
bitmap[y*(size.X)+x] = 255;
}
else
{
bitmap[y*(size.X)+x] = 0;
if (j >= yBottom && j <= yTop)
{
bitmap[j*(size.X)+i] = 255;
bitmap[j*(size.X)+2*rx-i] = 255;
}
else
{
bitmap[j*(size.X)+i] = 0;
bitmap[j*(size.X)+2*rx-i] = 0;
}
}
}
}