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convert SDL_Renderer circle & arcs to float maths

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a dinosaur 2024-03-10 20:35:08 +11:00
parent 8a5529e752
commit 123d228e14
2 changed files with 19 additions and 18 deletions
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36
src/draw.c
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@ -59,18 +59,18 @@ void DrawLine(int x1, int y1, int x2, int y2)
void DrawCircleSteps(int x, int y, int r, int steps)
{
double stepsz = (double)TAU / steps;
int lastx = r;
int lasty = 0;
const float stepsz = (float)TAU / steps;
const float mag = (float)r;
float lastx = mag;
float lasty = 0;
for (int i = 1; i <= steps; ++i)
{
const double mag = (double)r;
int ofsx = (int)round(cos(stepsz * i) * mag);
int ofsy = (int)round(sin(stepsz * i) * mag);
float ofsx = cosf(stepsz * i) * mag;
float ofsy = sinf(stepsz * i) * mag;
SDL_RenderLine(rend,
(float)(x + lastx), (float)(y + lasty),
(float)(x + ofsx), (float)(y + ofsy));
x + lastx, y + lasty,
x + ofsx, y + ofsy);
lastx = ofsx;
lasty = ofsy;
@ -79,21 +79,21 @@ void DrawCircleSteps(int x, int y, int r, int steps)
void DrawArcSteps(int x, int y, int r, int startAng, int endAng, int steps)
{
const double fstart = (double)startAng * DEG2RAD;
const double fstepSz = (double)(endAng - startAng) / abs(steps) * DEG2RAD;
const double mag = (double)r;
const float fstart = (float)startAng * (float)DEG2RAD;
const float fstepSz = (float)(endAng - startAng) / abs(steps) * (float)DEG2RAD;
const float mag = (float)r;
int lastx = (int)round(cos(fstart) * mag);
int lasty = (int)round(-sin(fstart) * mag);
float lastx = cosf(fstart) * mag;
float lasty = -sinf(fstart) * mag;
for (int i = 1; i <= steps; ++i)
{
const double theta = fstart + fstepSz * (double)i;
int ofsx = (int)round(cos(theta) * mag);
int ofsy = (int)round(-sin(theta) * mag);
const float theta = fstart + fstepSz * (float)i;
float ofsx = cosf(theta) * mag;
float ofsy = -sinf(theta) * mag;
SDL_RenderLine(rend,
(float)(x + lastx), (float)(y + lasty),
(float)(x + ofsx), (float)(y + ofsy));
x + lastx, y + lasty,
x + ofsx, y + ofsy);
lastx = ofsx;
lasty = ofsy;

1
src/draw_common.c
View File

@ -2,6 +2,7 @@
#include "maths.h"
#include <stdlib.h>
void DrawCircle(int x, int y, int r)
{
const int steps = (int)(sqrt((double)r) * 8.0);