Function _drawLine

Engine/source/gui/3d/guiTSControl.cpp:76–139

namespace 
{
   void _drawLine( const Point3F &p0, const Point3F &p1, const ColorI &color, F32 width )
   {
      F32 x1, x2, y1, y2, z1, z2;

      x1 = p0.x;
      y1 = p0.y;
      z1 = p0.z;
      x2 = p1.x;
      y2 = p1.y;
      z2 = p1.z;

      //
      // Convert Line   a----------b
      //
      // Into Quad      v0---------v1
      //                 a         b
      //                v2---------v3
      //

      Point2F start(x1, y1);
      Point2F end(x2, y2);
      Point2F perp, lineVec;

      // handle degenerate case where point a = b
      if(x1 == x2 && y1 == y2)
      {
         perp.set(0.0f, width * 0.5f);
         lineVec.set(0.1f, 0.0f);
      }
      else
      {
         perp.set(start.y - end.y, end.x - start.x);
         lineVec.set(end.x - start.x, end.y - start.y);
         perp.normalize(width * 0.5f);
         lineVec.normalize(0.1f);
      }
      start -= lineVec;
      end   += lineVec;

      GFXVertexBufferHandle<GFXVertexPCT> verts(GFX, 4, GFXBufferTypeVolatile);
      verts.lock();

      verts[0].point.set( start.x+perp.x, start.y+perp.y, z1 );
      verts[1].point.set( end.x+perp.x, end.y+perp.y, z2 );
      verts[2].point.set( start.x-perp.x, start.y-perp.y, z1 );
      verts[3].point.set( end.x-perp.x, end.y-perp.y, z2 );

      verts[0].color = color;
      verts[1].color = color;
      verts[2].color = color;
      verts[3].color = color;

      verts.unlock();
      GFX->setVertexBuffer( verts );

      GFXStateBlockDesc desc;
      desc.setCullMode(GFXCullNone);
      desc.setZReadWrite(false);