void dev_arc(int xc, int yc, double r, double start, double end, double aspect) {
double th, ph, xs, ys, xe, ye, x, y;
int i;
if (r < 1) {
r = 1;
}
while (end < start) {
end += M_PI * 2.0;
}
th = (end - start) / r;
xs = xc + r * cos(start);
ys = yc + r * aspect * sin(start);
xe = xc + r * cos(end);
ye = yc + r * aspect * sin(end);
x = xs;
y = ys;
for (i = 1; i < r; i++) {
ph = start + i * th;
xs = xc + r * cos(ph);
ys = yc + r * aspect * sin(ph);
dev_line(x, y, xs, ys);
x = xs;
y = ys;
}
dev_line(x, y, xe, ye);
}
/**
* draw rectangle (filled or not)
*/
void dev_rect(int x1, int y1, int x2, int y2, int fill) {
int px1, py1, px2, py2;
int c1, c2, in1, in2;
px1 = x1;
py1 = y1;
px2 = x2;
py2 = y2;
W2D4(x1, y1, x2, y2);
if (x1 == x2) {
dev_line(px1, py1, px2, py2);
return;
}
if (y1 == y2) {
dev_line(px1, py1, px2, py2);
return;
}
/*
* check inside
*/
CLIPENCODE(x1, y1, c1);
CLIPENCODE(x2, y2, c2);
in1 = CLIPIN(c1);
in2 = CLIPIN(c2);
if (in1 && in2) {
/*
* its inside
*/
osd_rect(x1, y1, x2, y2, fill);
} else {
/*
* partial inside
* TODO: something fast
*/
int y;
if (fill) {
for (y = py1; y <= py2; y++) {
dev_line(px1, y, px2, y);
}
} else {
dev_line(px1, py1, px1, py2);
dev_line(px1, py2, px2, py2);
dev_line(px2, py2, px2, py1);
dev_line(px2, py1, px1, py1);
}
}
}
/*
* Fills the scan line described by the current AET at the specified Y
* coordinate in the specified color, using the odd/even fill rule.
*/
void pf_scan_out_AET(int YToScan) {
int LeftX;
struct EdgeState *CurrentEdge;
/*
* Scan through the AET, drawing line segments as each pair of edge
* crossings is encountered. The nearest pixel on or to the right
* of left edges is drawn, and the nearest pixel to the left of but
* not on right edges is drawn
*/
CurrentEdge = AETPtr;
while (CurrentEdge != NULL) {
LeftX = CurrentEdge->X;
CurrentEdge = CurrentEdge->NextEdge;
/*
* 8/5/95, NDC: Zen's bug
*/
if (CurrentEdge->X)
dev_line(LeftX, YToScan, CurrentEdge->X - 1, YToScan);
CurrentEdge = CurrentEdge->NextEdge;
}
}
void set_4line(int x, int y, int xc, int yc) {
dev_line(xc - x, yc + y, xc + x, yc + y);
dev_line(xc - x, yc - y, xc + x, yc - y);
}
