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Improve drawing with digital zone highligts, futher colour tweaks, & thicker lines in GL.

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It's also now no longer possible to trigger NW & SE angles when digital is set to 4 direction.
This commit is contained in:
a dinosaur
2022-11-18 05:44:30 +11:00
parent 0cf89816cd
commit 4255841a6b
9 changed files with 177 additions and 42 deletions
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29
draw.c
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@ -87,6 +87,35 @@ void DrawCircleSteps(int x, int y, int r, int steps)
}
}
void DrawArc(int x, int y, int r, int startAng, int endAng)
{
const int steps = (int)(sqrt((double)r) * (double)abs(endAng - startAng) / 360.0 * 8.0);
DrawArcSteps(x, y, r, startAng, endAng, 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;
int lastx = (int)round(cos(fstart) * mag);
int lasty = (int)round(-sin(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);
SDL_RenderDrawLine(rend,
x + lastx, y + lasty,
x + ofsx, y + ofsy);
lastx = ofsx;
lasty = ofsy;
}
}
void DrawPresent(void)
{
SDL_RenderPresent(rend);