bool Image::is_binary() const {
for(int x=0 ; x < m_width ; ++x)
for(int y=0 ; y < m_height; ++y) {
Color c = color_at(x, y);
if(c != Color(0,0,0) && c != Color(1,1,1))
return false;
}
return true;
}
void Image::threshold(double d) {
greyscale();
for(int x = 0 ; x != width() ; ++x)
for(int y = 0 ; y != height() ; ++y) {
Color c = color_at(x, y);
plot(x, y, (c.red() >= d && c.blue() >= d && c.green() >= d ? Color(1,1,1) :
Color(0,0,0)));
}
}
graphics::color Gradient::color_at(posn point) const
{
if (contains(point)) {
// Maps the bounding box to the unit square
sample x = (point.x - get_bbox().left()) / get_bbox().width();
sample y = (point.y - get_bbox().top()) / get_bbox().height();
return color_at(x, y);
} else {
return color::transparent;
}
}
void Image::greyscale() {
auto color_to_grey = [] (Color c) -> double {
Color cc = gamma_decompress(c);
double y = 0.2126*cc.red() + 0.7152*cc.green() + 0.0722*cc.blue();
cc = Color(y,y,y);
cc = gamma_compress(c);
return cc.red();
};
for(int x = 0 ; x != width() ; ++x)
for(int y = 0 ; y != height() ; ++y) {
double c = color_to_grey(color_at(x, y));
plot(x, y, Color(c, c, c));
}
}
unsigned long colorizator(t_list *list, t_vect3d inter\
, t_env *e)
{
unsigned long ret;
if (list->type == 'a')
{
ret = color_at(e, inter);
}
if (list->type == 'b')
{
ret = color_at_p(e, inter);
}
if (list->type == 'c')
{
ret = color_at_c(e, inter);
}
if (list->type == 'd')
{
ret = color_at_cone(e, inter);
}
return (ret);
}
// Computes the color at an abstract (unit square) position by
// projecting it to 1-D and then delegating to color_at(sample).
Drawing::color Gradient::color_at(sample x, sample y) const
{
return color_at(projector_.project(x, y));
}
