void draw_line(agg::grid_rasterizer& ras,
double x1, double y1,
double x2, double y2,
double width)
{
double dx = x2 - x1;
double dy = y2 - y1;
double d = sqrt(dx*dx + dy*dy);
dx = width * (y2 - y1) / d;
dy = width * (x2 - x1) / d;
ras.move_to_d(x1 - dx, y1 + dy);
ras.line_to_d(x2 - dx, y2 + dy);
ras.line_to_d(x2 + dx, y2 - dy);
ras.line_to_d(x1 + dx, y1 - dy);
}
void draw_ellipse(agg::grid_rasterizer& ras,
double x, double y,
double rx, double ry)
{
int i;
ras.move_to_d(x + rx, y);
for(i = 1; i < 360; i++)
{
double a = double(i) * 3.1415926 / 180.0;
ras.line_to_d(x + cos(a) * rx, y + sin(a) * ry);
}
}
void draw_ellipse(agg::grid_rasterizer& ras,
double x, double y,
double rx, double ry)
{
int i;
ras.move_to_d(x + rx, y);
// Here we have a fixed number of approximation steps, namely 360
// while in reality it's supposed to be smarter.
for(i = 1; i < 360; i++)
{
double a = double(i) * 3.1415926 / 180.0;
ras.line_to_d(x + cos(a) * rx, y + sin(a) * ry);
}
}