int
ImagingDrawPoint(Imaging im, int x0, int y0, const void* ink_, int op)
{
DRAW* draw;
INT32 ink;
DRAWINIT();
draw->point(im, x0, y0, ink);
return 0;
}
int
ImagingDrawWideLine(Imaging im, int x0, int y0, int x1, int y1,
const void* ink_, int width, int op)
{
DRAW* draw;
INT32 ink;
int dx, dy;
double big_hypotenuse, small_hypotenuse, ratio_max, ratio_min;
int dxmin, dxmax, dymin, dymax;
Edge e[4];
DRAWINIT();
if (width <= 1) {
draw->line(im, x0, y0, x1, y1, ink);
return 0;
}
dx = x1-x0;
dy = y1-y0;
if (dx == 0 && dy == 0) {
draw->point(im, x0, y0, ink);
return 0;
}
big_hypotenuse = sqrt((double) (dx*dx + dy*dy));
small_hypotenuse = (width - 1) / 2.0;
ratio_max = ROUND_UP(small_hypotenuse) / big_hypotenuse;
ratio_min = ROUND_DOWN(small_hypotenuse) / big_hypotenuse;
dxmin = ROUND_DOWN(ratio_min * dy);
dxmax = ROUND_DOWN(ratio_max * dy);
dymin = ROUND_DOWN(ratio_min * dx);
dymax = ROUND_DOWN(ratio_max * dx);
{
int vertices[4][2] = {
{x0 - dxmin, y0 + dymax},
{x1 - dxmin, y1 + dymax},
{x1 + dxmax, y1 - dymin},
{x0 + dxmax, y0 - dymin}
};
add_edge(e+0, vertices[0][0], vertices[0][1], vertices[1][0], vertices[1][1]);
add_edge(e+1, vertices[1][0], vertices[1][1], vertices[2][0], vertices[2][1]);
add_edge(e+2, vertices[2][0], vertices[2][1], vertices[3][0], vertices[3][1]);
add_edge(e+3, vertices[3][0], vertices[3][1], vertices[0][0], vertices[0][1]);
draw->polygon(im, 4, e, ink, 0);
}
return 0;
}
