//---------------------------------------------------------
bool CView_Map_3DPanel::On_Draw(void)
{
if( !m_DEM.is_Valid() )
{
return( false );
}
//-----------------------------------------------------
#pragma omp parallel for
for(int y=1; y<m_DEM.Get_NY(); y++)
{
for(int x=1; x<m_DEM.Get_NX(); x++)
{
TSG_Triangle_Node p[3];
if( Get_Node(x - 1, y - 1, p[0])
&& Get_Node(x , y , p[1]) )
{
if( Get_Node(x, y - 1, p[2]) )
{
Draw_Triangle(p, true);
}
if( Get_Node(x - 1, y, p[2]) )
{
Draw_Triangle(p, true);
}
}
}
}
//-----------------------------------------------------
return( true );
}
//------------------------------------------------------------------------------
// Draws a generic overlay
//------------------------------------------------------------------------------
void DrawOverlay( OverlayBase_t *pOverlay )
{
switch( pOverlay->m_Type)
{
case OVERLAY_LINE:
{
// Draw the line
OverlayLine_t *pLine = static_cast<OverlayLine_t*>(pOverlay);
Draw_Line( pLine->origin, pLine->dest, pLine->r, pLine->g, pLine->b, pLine->noDepthTest);
}
break;
case OVERLAY_BOX:
{
// Draw the box
OverlayBox_t *pCurrBox = static_cast<OverlayBox_t*>(pOverlay);
if (pCurrBox->a > 0.0)
{
Draw_AlphaBox( pCurrBox->origin, pCurrBox->mins, pCurrBox->maxs, pCurrBox->angles, pCurrBox->r, pCurrBox->g, pCurrBox->b, pCurrBox->a);
}
Draw_WireframeBox( pCurrBox->origin, pCurrBox->mins, pCurrBox->maxs, pCurrBox->angles, pCurrBox->r, pCurrBox->g, pCurrBox->b);
}
break;
case OVERLAY_SWEPT_BOX:
{
OverlaySweptBox_t *pBox = static_cast<OverlaySweptBox_t*>(pOverlay);
Draw_WireframeSweptBox( pBox );
}
break;
case OVERLAY_TRIANGLE:
{
OverlayTriangle_t *pTriangle = static_cast<OverlayTriangle_t*>(pOverlay);
Draw_Triangle( pTriangle->p1, pTriangle->p2, pTriangle->p3, pTriangle->r,
pTriangle->g, pTriangle->b, pTriangle->a, pTriangle->noDepthTest );
}
break;
default:
Assert(0);
}
}
//---------------------------------------------------------
void CSG_3DView_Canvas::Draw_Triangle(TSG_Triangle_Node p[3], double Light_Dec, double Light_Azi)
{
double A = p[0].z * (p[1].x - p[2].x) + p[1].z * (p[2].x - p[0].x) + p[2].z * (p[0].x - p[1].x);
double B = p[0].y * (p[1].z - p[2].z) + p[1].y * (p[2].z - p[0].z) + p[2].y * (p[0].z - p[1].z);
double C = p[0].x * (p[1].y - p[2].y) + p[1].x * (p[2].y - p[0].y) + p[2].x * (p[0].y - p[1].y);
double s, a;
if( C != 0.0 )
{
A = - A / C;
B = - B / C;
s = M_PI_090 - atan(sqrt(A*A + B*B));
a = A != 0.0 ? M_PI_180 + atan2(B, A) : B > 0.0 ? M_PI_270 : (B < 0.0 ? M_PI_090 : -1.0);
}
else
{
s = 0.0;
a = 0.0;
}
Draw_Triangle(p, (acos(sin(s) * sin(Light_Dec) + cos(s) * cos(Light_Dec) * cos(a - Light_Azi))) / M_PI_090);
}
void redraw()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);//清除颜色缓存和深度缓存
glLoadIdentity(); //初始化矩阵为单位矩阵
gluLookAt(eye[0], eye[1], eye[2],
center[0], center[1], center[2],
0, 1, 0); // 场景（0，0，0）的视点中心 (0,5,50)，Y轴向上
if (bWire) {
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
//设置多边形绘制模式：正反面，线型
}
else {
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
//设置多边形绘制模式：正反面，填充
}
glEnable(GL_DEPTH_TEST);//开启深度测试
glEnable(GL_LIGHTING); //开启光照模式
GLfloat white[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat light_pos[] = { 5,5,5,1 };
glLightfv(GL_LIGHT0, GL_POSITION, light_pos);//光源位置
glLightfv(GL_LIGHT0, GL_AMBIENT, white);//定义白色
glEnable(GL_LIGHT0);//开启第0号光源
glRotatef(fRotate, 0, 1.0f, 0); //旋转
glRotatef(-90, 1, 0, 0);
glScalef(0.2, 0.2, 0.2);//缩放
Draw_Triangle();//绘制场景
if (bAnim) fRotate += 0.5f;//旋转因子改变
glutSwapBuffers(); //交换缓冲区
}
