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gui/game/brush: Add smooth/organic elliptical brush

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Not sure why TPT's ellptical brush currently looks like that,
when you type "pixel circle" on Google every result is the
smooth version.

Got the idea from this post:
https://powdertoy.co.uk/Browse/View.html?ID=2464991

Signed-off-by: Nick Renieris <velocityra@gmail.com>
This commit is contained in:
Nick Renieris 2019-09-26 23:13:36 +03:00 committed by Tamás Bálint Misius
parent 0b1cd53377
commit 024c3c1b45
1 changed files with 3 additions and 1 deletions
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4
src/gui/game/EllipseBrush.h
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@ -31,7 +31,9 @@ public:
int yTop = ry+1, yBottom, i;
for (i = 0; i <= rx; i++)
{
while (pow(i-rx,2.0)*pow(ry,2.0) + pow(yTop-ry,2.0)*pow(rx,2.0) <= pow(rx,2.0)*pow(ry,2.0))
while ( pow(i - rx, 2.0) * pow(ry - 0.5, 2.0) +
pow(yTop - ry, 2.0) * pow(rx - 0.5, 2.0) <=
pow(rx, 2.0) * pow(ry, 2.0))
yTop++;
yBottom = 2*ry - yTop;
for (int j = 0; j <= ry*2; j++)