学步园

//在屏幕坐下角显示坐标轴<br /> void CSpherical_ImageView::DrawAxisIcon()<br /> {<br /> CVect3 positionOut;<br /> static int updatecnt = 0;<br /> static GLint viewport[4];<br /> static GLdouble modelview[16];<br /> static GLdouble projection[16];<br /> GLdouble posX, posY, posZ;<br /> glGetDoublev(GL_MODELVIEW_MATRIX, modelview);<br /> glGetDoublev(GL_PROJECTION_MATRIX, projection);<br /> glGetIntegerv(GL_VIEWPORT, viewport);<br /> //AxisZero[0] = 70.0;<br /> //AxisZero[1] = 70.0;<br /> glReadBuffer( GL_BACK );</p> <p> gluUnProject(AxisZero[0], AxisZero[1], 0.5, modelview, projection, viewport, &posX, &posY, &posZ);<br /> //gluUnProject(600, 400, 0.5, modelview, projection, viewport, &posX, &posY, &posZ);<br /> positionOut.X = (float)posX;<br /> positionOut.Y = (float)posY;<br /> positionOut.Z = (float)posZ;</p> <p> glPushAttrib(GL_CURRENT_BIT);<br /> glPushMatrix();<br /> glLineWidth(2.0);</p> <p> float size = 0.1;<br /> glBegin(GL_LINES);<br /> glColor3f(1.0f,0.0f,0.0f);<br /> glVertex3f(positionOut.X,positionOut.Y,positionOut.Z);<br /> glVertex3f(positionOut.X+0.2*size,positionOut.Y,positionOut.Z);<br /> glVertex3f(positionOut.X+0.2*size,positionOut.Y,positionOut.Z);<br /> glVertex3f(positionOut.X+0.18*size,positionOut.Y+0.02*size,positionOut.Z);<br /> glVertex3f(positionOut.X+0.2*size,positionOut.Y,positionOut.Z);<br /> glVertex3f(positionOut.X+0.18*size,positionOut.Y-0.02*size,positionOut.Z);<br /> glEnd();</p> <p> glBegin(GL_LINES);<br /> glColor3f(0.0f,1.0f,0.0f);<br /> glVertex3f(positionOut.X,positionOut.Y,positionOut.Z);<br /> glVertex3f(positionOut.X,positionOut.Y+0.2*size,positionOut.Z);<br /> glVertex3f(positionOut.X,positionOut.Y+0.2*size,positionOut.Z);<br /> glVertex3f(positionOut.X+0.02*size,positionOut.Y+0.18*size,positionOut.Z);<br /> glVertex3f(positionOut.X,positionOut.Y+0.2*size,positionOut.Z);<br /> glVertex3f(positionOut.X-0.02*size,positionOut.Y+0.18*size,positionOut.Z);<br /> glEnd();</p> <p> glBegin(GL_LINES);<br /> glColor3f(0.0f,1.0f,1.0f);<br /> glVertex3f(positionOut.X,positionOut.Y,positionOut.Z);<br /> glVertex3f(positionOut.X,positionOut.Y,positionOut.Z+0.2*size);<br /> glVertex3f(positionOut.X,positionOut.Y,positionOut.Z+0.2*size);<br /> glVertex3f(positionOut.X,positionOut.Y+0.02*size,positionOut.Z+0.18*size);<br /> glVertex3f(positionOut.X,positionOut.Y,positionOut.Z+0.2*size);<br /> glVertex3f(positionOut.X,positionOut.Y-0.02*size,positionOut.Z+0.18*size);<br /> glEnd();</p> <p> glColor3f(1.0f, 0.0f, 0.0f);<br /> glRasterPos3d(positionOut.X+0.22*size,positionOut.Y,positionOut.Z);<br /> DrawText("X");<br /> glColor3f(0.0f,1.0f,0.0f);<br /> glRasterPos3d(positionOut.X,positionOut.Y+0.22*size,positionOut.Z);<br /> DrawText("Y");<br /> glColor3f(0.0f,1.0f,1.0f);<br /> glRasterPos3d(positionOut.X,positionOut.Y,positionOut.Z+0.22*size);<br /> DrawText("Z");</p> <p> glPopAttrib();<br /> glPopMatrix();<br /> }<br /> //往屏幕输出文字<br /> void CSpherical_ImageView::DrawText(char* string)<br /> {<br /> char* p = NULL;<br /> for (p = string; *p; p++)<br /> glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, *p);<br /> }

在头文件中加

GLfloat AxisZero[2];//左下角小坐标的位置

调用DrawAxisIcon()函数就可以了。