Garhoogin/NitroPaint
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Fix circle rendering

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Garhoogin 2025-05-30 01:16:09 -05:00 committed by GitHub
parent a6a4b187fe
commit 97df0dfd29
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1 changed files with 8 additions and 2 deletions
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10
NitroPaint/framebuffer.c
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@ -1,5 +1,7 @@
#include "framebuffer.h" #include "framebuffer.h"
#include <math.h>
void FbCreate(FrameBuffer *fb, HWND hWnd, int width, int height) { void FbCreate(FrameBuffer *fb, HWND hWnd, int width, int height) {
//create DC //create DC
HDC hDC = GetDC(hWnd); HDC hDC = GetDC(hWnd);
@ -130,10 +132,11 @@ void FbRenderSolidCircle(FrameBuffer *fb, int cx, int cy, int cr, COLOR32 col) {
col = REVERSE(col); col = REVERSE(col);
//use midpoint circle algorithm //use midpoint circle algorithm
int nStep = (int) ceil(((float) cr) * 0.7071f); for (int x = 0; x < cr; x++) {
for (int x = 0; x < nStep; x++) {
//compute intersection //compute intersection
int y = (int) (sqrt(r2 - x * x) + 0.5f); int y = (int) (sqrt(r2 - x * x) + 0.5f);
if (y < x) break;
FbPutPixel(fb, cx + x, cy + y, col); FbPutPixel(fb, cx + x, cy + y, col);
FbPutPixel(fb, cx - x, cy + y, col); FbPutPixel(fb, cx - x, cy + y, col);
FbPutPixel(fb, cx + x, cy - y, col); FbPutPixel(fb, cx + x, cy - y, col);
@ -142,6 +145,9 @@ void FbRenderSolidCircle(FrameBuffer *fb, int cx, int cy, int cr, COLOR32 col) {
FbPutPixel(fb, cx - y, cy + x, col); FbPutPixel(fb, cx - y, cy + x, col);
FbPutPixel(fb, cx + y, cy - x, col); FbPutPixel(fb, cx + y, cy - x, col);
FbPutPixel(fb, cx - y, cy - x, col); FbPutPixel(fb, cx - y, cy - x, col);
//fixes 1-pixel corner artifacts
if (y == (x + 1)) break;
} }
} }