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Add Lua function gui.circle()

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This commit is contained in:
Ilari Liusvaara 2011-10-22 15:15:18 +03:00
parent 92cc0b0d89
commit a1f8869f94
2 changed files with 105 additions and 0 deletions
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71
lua/gui-circle.cpp Normal file
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@ -0,0 +1,71 @@
#include "lua-int.hpp"
#include "render.hpp"
namespace
{
struct render_object_circle : public render_object
{
render_object_circle(int32_t _x, int32_t _y, uint32_t _radius,
premultiplied_color _outline, premultiplied_color _fill, uint32_t _thickness) throw()
: x(_x), y(_y), outline(_outline), fill(_fill)
{
radius = _radius;
radius2 = static_cast<uint64_t>(_radius) * _radius;
if(_thickness > _radius)
iradius2 = 0;
else
iradius2 = static_cast<uint64_t>(_radius - _thickness) *
(_radius - _thickness);
}
~render_object_circle() throw() {}
void operator()(struct screen& scr) throw()
{
int32_t xmin = -radius;
int32_t xmax = radius;
int32_t ymin = -radius;
int32_t ymax = radius;
clip_range(scr.originx, scr.width, x, xmin, xmax);
clip_range(scr.originy, scr.height, y, ymin, ymax);
for(int32_t r = ymin; r < ymax; r++) {
uint64_t pd2 = static_cast<int64_t>(r) * r;
uint32_t* rptr = scr.rowptr(y + r + scr.originy);
size_t eptr = x + xmin + scr.originx;
for(int32_t c = xmin; c < xmax; c++, eptr++) {
uint64_t fd2 = pd2 + static_cast<int64_t>(c) * c;
if(fd2 > radius2)
continue;
else if(fd2 >= iradius2)
outline.apply(rptr[eptr]);
else
fill.apply(rptr[eptr]);
}
}
}
private:
int32_t x;
int32_t y;
int32_t radius;
uint64_t radius2;
uint64_t iradius2;
premultiplied_color outline;
premultiplied_color fill;
};
function_ptr_luafun gui_rectangle("gui.circle", [](lua_State* LS, const std::string& fname) -> int {
if(!lua_render_ctx)
return 0;
int64_t outline = 0xFFFFFFU;
int64_t fill = -1;
uint32_t thickness = 1;
int32_t x = get_numeric_argument<int32_t>(LS, 1, fname.c_str());
int32_t y = get_numeric_argument<int32_t>(LS, 2, fname.c_str());
uint32_t radius = get_numeric_argument<uint32_t>(LS, 3, fname.c_str());
get_numeric_argument<uint32_t>(LS, 4, thickness, fname.c_str());
get_numeric_argument<int64_t>(LS, 5, outline, fname.c_str());
get_numeric_argument<int64_t>(LS, 6, fill, fname.c_str());
premultiplied_color poutline(outline);
premultiplied_color pfill(fill);
lua_render_ctx->queue->add(*new render_object_circle(x, y, radius, poutline, pfill, thickness));
return 0;
});
}

34
manual.lyx
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@ -1982,6 +1982,40 @@ y2: Y-coordinate of the other end.
color: Color of the line (default is 0xFFFFFF (white)).
\end_layout
\begin_layout Subsubsection
gui.circle(number x, number y, number r[, number thick[, number border[,
number fil]]])
\end_layout
\begin_layout Standard
Draw a circle.
Parameters.
\end_layout
\begin_layout Itemize
x: X-coordinate of the center
\end_layout
\begin_layout Itemize
y: Y-coordinate of the center
\end_layout
\begin_layout Itemize
r: The radius of the circle
\end_layout
\begin_layout Itemize
thick: Border thickness
\end_layout
\begin_layout Itemize
border: Border color (default is 0xFFFFFF (white))
\end_layout
\begin_layout Itemize
fill: Fill color (default is -1 (transparent)).
\end_layout
\begin_layout Subsubsection
gui.repaint()
\end_layout