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[python] merge '6fcab395' and fix a bug in fill_polygon()

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Laury
2021-08-30 19:38:40 +02:00
parent 6f797833b2 6fcab3952f
commit 7c1dc4d5c3
18 changed files with 236 additions and 3 deletions
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49
kandinsky/src/context_circle.cpp Normal file
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#include <kandinsky/context.h>
#include <assert.h>
#include <math.h>
void KDContext::drawCircle(KDPoint c, KDCoordinate r, KDColor color) {
//The used algorithm is the Bresenham's arc tracing algorithm
KDCoordinate x, y, m;
x = 0;
y = r;
m = 5 - 4*r;
while(x <= y) {
setPixel(c.translatedBy(KDPoint(x,y)), color);
setPixel(c.translatedBy(KDPoint(y,x)), color);
setPixel(c.translatedBy(KDPoint(-x,y)), color);
setPixel(c.translatedBy(KDPoint(-y,x)), color);
setPixel(c.translatedBy(KDPoint(x,-y)), color);
setPixel(c.translatedBy(KDPoint(y,-x)), color);
setPixel(c.translatedBy(KDPoint(-x,-y)), color);
setPixel(c.translatedBy(KDPoint(-y,-x)), color);
if(m > 0) {
y = y - 1;
m = m - 8*y;
}
x = x + 1;
m = m + 8*x + 4;
}
}
void KDContext::fillCircle(KDPoint c, KDCoordinate r, KDColor color) {
KDCoordinate left = c.x()-r;
KDCoordinate right = c.x()+r;
if(left < 0) {
left = 0;
}
if(right > m_clippingRect.width()) {
right = m_clippingRect.width();
}
for(KDCoordinate x=left; x<=right; x++) {
KDCoordinate semiHeight = sqrt((r*r)-((c.x()-x)*(c.x()-x)));
fillRect(KDRect(x, c.y()-semiHeight, 1, semiHeight * 2 ), color);
}
}