96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
|
#include "lua-int.hpp"
|
||
|
|
#include "render.hpp"
|
||
|
|
|
||
|
|
namespace
|
||
|
|
{
|
||
|
|
struct render_object_line : public render_object
|
||
|
|
{
|
||
|
|
render_object_line(int32_t _x1, int32_t _x2, int32_t _y1, int32_t _y2, premultiplied_color _color)
|
||
|
|
throw()
|
||
|
|
: x1(_x1), y1(_y1), x2(_x2), y2(_y2), color(_color) {}
|
||
|
|
~render_object_line() throw() {}
|
||
|
|
void operator()(struct screen& scr) throw()
|
||
|
|
{
|
||
|
|
int32_t xdiff = x2 - x1;
|
||
|
|
int32_t ydiff = y2 - y1;
|
||
|
|
if(xdiff < 0)
|
||
|
|
xdiff = -xdiff;
|
||
|
|
if(ydiff < 0)
|
||
|
|
ydiff = -ydiff;
|
||
|
|
if(xdiff >= ydiff) {
|
||
|
|
//X-major line.
|
||
|
|
if(x2 < x1) {
|
||
|
|
//Swap points so that x1 < x2.
|
||
|
|
std::swap(x1, x2);
|
||
|
|
std::swap(y1, y2);
|
||
|
|
}
|
||
|
|
//The slope of the line is (y2 - y1) / (x2 - x1) = +-ydiff / xdiff
|
||
|
|
int32_t y = y1;
|
||
|
|
int32_t ysub = 0;
|
||
|
|
for(int32_t x = x1; x <= x2; x++) {
|
||
|
|
if(x < 0 || static_cast<uint32_t>(x) >= scr.width)
|
||
|
|
goto nodraw1;
|
||
|
|
if(y < 0 || static_cast<uint32_t>(y) >= scr.height)
|
||
|
|
goto nodraw1;
|
||
|
|
color.apply(scr.rowptr(y)[x]);
|
||
|
|
nodraw1:
|
||
|
|
ysub += ydiff;
|
||
|
|
if(ysub >= xdiff) {
|
||
|
|
ysub -= xdiff;
|
||
|
|
if(y2 > y1)
|
||
|
|
y++;
|
||
|
|
else
|
||
|
|
y--;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
//Y-major line.
|
||
|
|
if(x2 < x1) {
|
||
|
|
//Swap points so that y1 < y2.
|
||
|
|
std::swap(x1, x2);
|
||
|
|
std::swap(y1, y2);
|
||
|
|
}
|
||
|
|
//The slope of the line is (x2 - x1) / (y2 - y1) = +-xdiff / ydiff
|
||
|
|
int32_t x = x1;
|
||
|
|
int32_t xsub = 0;
|
||
|
|
for(int32_t y = y1; y <= y2; y++) {
|
||
|
|
if(x < 0 || static_cast<uint32_t>(x) >= scr.width)
|
||
|
|
goto nodraw2;
|
||
|
|
if(y < 0 || static_cast<uint32_t>(y) >= scr.height)
|
||
|
|
goto nodraw2;
|
||
|
|
color.apply(scr.rowptr(y)[x]);
|
||
|
|
nodraw2:
|
||
|
|
xsub += xdiff;
|
||
|
|
if(xsub >= ydiff) {
|
||
|
|
xsub -= ydiff;
|
||
|
|
if(x2 > x1)
|
||
|
|
x++;
|
||
|
|
else
|
||
|
|
x--;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
private:
|
||
|
|
int32_t x1;
|
||
|
|
int32_t y1;
|
||
|
|
int32_t x2;
|
||
|
|
int32_t y2;
|
||
|
|
premultiplied_color color;
|
||
|
|
};
|
||
|
|
|
||
|
|
function_ptr_luafun gui_pixel("gui.line", [](lua_State* LS, const std::string& fname) -> int {
|
||
|
|
if(!lua_render_ctx)
|
||
|
|
return 0;
|
||
|
|
int64_t color = 0xFFFFFFU;
|
||
|
|
int32_t x1 = get_numeric_argument<int32_t>(LS, 1, fname.c_str());
|
||
|
|
int32_t y1 = get_numeric_argument<int32_t>(LS, 2, fname.c_str());
|
||
|
|
int32_t x2 = get_numeric_argument<int32_t>(LS, 3, fname.c_str());
|
||
|
|
int32_t y2 = get_numeric_argument<int32_t>(LS, 4, fname.c_str());
|
||
|
|
get_numeric_argument<int64_t>(LS, 5, color, fname.c_str());
|
||
|
|
premultiplied_color pcolor(color);
|
||
|
|
lua_render_ctx->queue->add(*new render_object_line(x1, x2, y1, y2, pcolor));
|
||
|
|
return 0;
|
||
|
|
});
|
||
|
|
}
|