//! Draws the outline of a 2d rectangle
void CNullDriver::draw2DRectangleOutline(const rectanglei& pos, SColor color)
{
draw2DLine(pos.UpperLeftCorner, position2di(pos.LowerRightCorner.X, pos.UpperLeftCorner.Y), color);
draw2DLine(position2di(pos.LowerRightCorner.X, pos.UpperLeftCorner.Y), pos.LowerRightCorner, color);
draw2DLine(pos.LowerRightCorner, position2di(pos.UpperLeftCorner.X, pos.LowerRightCorner.Y), color);
draw2DLine(position2di(pos.UpperLeftCorner.X, pos.LowerRightCorner.Y), pos.UpperLeftCorner, color);
}
//! Draws a non filled concyclic regular 2d polyon.
void CNullDriver::draw2DPolygon(position2d<s32> center,
f32 radius, SColor color, s32 count)
{
if (count < 2)
return;
position2d<s32> first;
position2d<s32> a,b;
for (s32 j=0; j<count; ++j)
{
b = a;
f32 p = j / (f32)count * (PI*2);
a = center + position2d<s32>((s32)(sin(p)*radius), (s32)(cos(p)*radius));
if (j==0)
first = a;
else
draw2DLine(a, b, color);
}
draw2DLine(a, first, color);
}
//=========================================================================
//
// 计算要画的直线，把点集合装到容器里去
//
//=========================================================================
void drawLine(const Line2D & line, std::vector<Point2D_int> & drawPointSet)
{
// 清空容器
drawPointSet.clear();
// 对要画的直线进行裁剪
Line2D clippedLine = line; // clippedLineFromRect 会修改传递进去的参数 line
if (clippedLineFromRect(clippedLine, ClippingSize)) {
// 计算出要画的直线的点的集合
draw2DLine(clippedLine, drawPointSet);
// 开始画
for (const auto & point : drawPointSet) {
glVertex2f(point.x , point.y);
}
}
}
