本文整理汇总了C++中Box2i::left方法的典型用法代码示例。如果您正苦于以下问题：C++ Box2i::left方法的具体用法？C++ Box2i::left怎么用？C++ Box2i::left使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Box2i的用法示例。
在下文中一共展示了Box2i::left方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: triangleRender
static bool triangleRender(const Triangle2i& triangle,SmartPointer<Texture> _rgb,SmartPointer<Texture> _alpha,Color4f color,const Box2i& box, bool bWrite)
{
XgeDebugAssert(_rgb->bpp==24 && _alpha->bpp==8 && _rgb->width==_alpha->width && _rgb->height==_alpha->height);
int x1=triangle.p0.x,y1=triangle.p0.y;
int x2=triangle.p1.x,y2=triangle.p1.y;
int x3=triangle.p2.x,y3=triangle.p2.y;
unsigned char* rgb =_rgb ->buffer;
unsigned char* alpha =_alpha->buffer;
int W =_rgb ->width;
int minx = min3(x1, x2, x3) , maxx = max3(x1, x2, x3);
int miny = min3(y1, y2, y3) , maxy = max3(y1, y2, y3);
//must be completely be contained in the current area
if (!(minx>=box.left() && maxx<=box.right() && miny>=box.bottom() && maxy<=box.top()))
{
XgeDebugAssert(!bWrite);
return false;
}
int Sign=(((x2-x1)*(y3-y1)-(x3-x1)*(y2-y1))>=0)?(+1):(-1);
for(int y = miny; y <= maxy; y++)
for(int x = minx; x <= maxx; x++)
{
// if the pixel is inside....
if
(
(Sign*((x2 - x1) * (y - y1) - (y2 - y1) * (x - x1)) >= 0) &&
(Sign*((x3 - x2) * (y - y2) - (y3 - y2) * (x - x2)) >= 0) &&
(Sign*((x1 - x3) * (y - y3) - (y1 - y3) * (x - x3)) >= 0)
)
{
int idx=y*W+x;
//test if it has already been written
//note: for each pixel consider also the pixel (-1,0) (+1,0) (0,-1) (0,+1)
if (!bWrite && (alpha[idx] || alpha[idx-1] || alpha[idx+1] ||alpha[idx-W] || alpha[idx+W]))
return false;
//if write....
if (bWrite)
{
unsigned char R=(unsigned char)(255.0f*color.r);
unsigned char G=(unsigned char)(255.0f*color.g);
unsigned char B=(unsigned char)(255.0f*color.b);
rgb[idx*3+0] = R;
rgb[idx*3+1] = G;
rgb[idx*3+2] = B;
rgb[(idx-1)*3+0] = rgb[(idx+1)*3+0] = rgb[(idx-W)*3+0] = rgb[(idx+W)*3+0] =R ;
rgb[(idx-1)*3+1] = rgb[(idx+1)*3+1] = rgb[(idx-W)*3+1] = rgb[(idx+W)*3+1] =G ;
rgb[(idx-1)*3+2] = rgb[(idx+1)*3+2] = rgb[(idx-W)*3+2] =rgb[(idx+W)*3+2] =B ;
//sign as drawn
alpha [idx ] = 0x01;
alpha [idx-1] = 0x01;
alpha [idx+1] = 0x01;
alpha [idx-W] = 0x01;
alpha [idx+W] = 0x01;
}
}
}
return true;
}