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offset circle & arc lines by half a pixel to improve alignment

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a dinosaur
2024-03-10 20:54:16 +11:00
parent 18afba5e5d
commit 96d1ae11f7
1 changed files with 10 additions and 4 deletions
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14
src/draw.c
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@ -59,6 +59,9 @@ void DrawLine(int x1, int y1, int x2, int y2)
void DrawCircleSteps(int x, int y, int r, int steps) void DrawCircleSteps(int x, int y, int r, int steps)
{ {
const float fx = (float)x - 0.5f;
const float fy = (float)y - 0.5f;
const float stepsz = (float)TAU / steps; const float stepsz = (float)TAU / steps;
const float mag = (float)r; const float mag = (float)r;
float lastx = mag; float lastx = mag;
@ -69,8 +72,8 @@ void DrawCircleSteps(int x, int y, int r, int steps)
float ofsy = sinf(stepsz * i) * mag; float ofsy = sinf(stepsz * i) * mag;
SDL_RenderLine(rend, SDL_RenderLine(rend,
x + lastx, y + lasty, fx + lastx, fy + lasty,
x + ofsx, y + ofsy); fx + ofsx, fy + ofsy);
lastx = ofsx; lastx = ofsx;
lasty = ofsy; lasty = ofsy;
@ -79,6 +82,9 @@ void DrawCircleSteps(int x, int y, int r, int steps)
void DrawArcSteps(int x, int y, int r, int startAng, int endAng, int steps) void DrawArcSteps(int x, int y, int r, int startAng, int endAng, int steps)
{ {
const float fx = (float)x - 0.5f;
const float fy = (float)y - 0.5f;
const float fstart = (float)startAng * (float)DEG2RAD; const float fstart = (float)startAng * (float)DEG2RAD;
const float fstepSz = (float)(endAng - startAng) / abs(steps) * (float)DEG2RAD; const float fstepSz = (float)(endAng - startAng) / abs(steps) * (float)DEG2RAD;
const float mag = (float)r; const float mag = (float)r;
@ -92,8 +98,8 @@ void DrawArcSteps(int x, int y, int r, int startAng, int endAng, int steps)
float ofsy = -sinf(theta) * mag; float ofsy = -sinf(theta) * mag;
SDL_RenderLine(rend, SDL_RenderLine(rend,
x + lastx, y + lasty, fx + lastx, fy + lasty,
x + ofsx, y + ofsy); fx + ofsx, fy + ofsy);
lastx = ofsx; lastx = ofsx;
lasty = ofsy; lasty = ofsy;