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Better lighting and a circle algorithm that works more reliably.

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This commit is contained in:
Zed A. Shaw 2024-12-25 00:27:45 -05:00
parent 03fe9b3d01
commit 35f2defc11
9 changed files with 97 additions and 87 deletions
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48
matrix.cpp
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@ -183,48 +183,18 @@ namespace matrix {
circle::circle(Point center, int radius) :
center(center), radius(radius)
{
xi = 0;
yi = radius;
m = 5 - 4 * radius;
step = 0;
}
void circle::update() {
if(m > 0) {
yi--;
m -= 8 * yi;
}
xi++;
m += 8 * xi + 4;
top = max(center.y - radius, size_t(0));
bottom = center.y + radius;
y = top;
}
bool circle::next() {
if(xi <= yi) {
switch(step % 4) {
case 0:
x0 = center.x - xi;
y = center.y - yi;
x1 = center.x + xi;
break;
case 1:
x0 = center.x - yi;
y = center.y - xi;
x1 = center.x + yi;
break;
case 2:
x0 = center.x - yi;
y = center.y + xi;
x1 = center.x + yi;
break;
case 3:
x0 = center.x - xi;
y = center.y + yi;
x1 = center.x + xi;
update();
break;
}
step++;
y++;
if(y <= bottom) {
dy = y - center.y;
dx = floor(sqrt(radius * radius - dy * dy));
left = center.x - dx;
right = center.x + dx;
return true;
} else {
return false;