期末用2019.6（计算机图形学3，4次上机题的所有代码）

第4次上机

主要内容：二维投影，三维投影，图形放大缩小

void CTestView::ReadPoint()//点表
{//顶点的三维坐标(x,y,z),立方体边长为2adouble a=150;	P[0].x = -a / 2; P[0].y = -a / 2; P[0].z = -a / 2;P[1].x = +a / 2; P[1].y = -a / 2; P[1].z = -a / 2;P[2].x = +a / 2; P[2].y = +a / 2; P[2].z = -a / 2;P[3].x = -a / 2; P[3].y = +a / 2; P[3].z = -a / 2;P[4].x = -a / 2; P[4].y = -a / 2; P[4].z = +a / 2;P[5].x = +a / 2; P[5].y = -a / 2; P[5].z = +a / 2;P[6].x = +a / 2; P[6].y =+a / 2; P[6].z = +a / 2;P[7].x = -a / 2; P[7].y = +a / 2; P[7].z = +a / 2;
}void CTestView::ReadFace()//面表
{//面的顶点数和面的顶点索引F[0].SetNum(4); F[0].vI[0] = 4;  F[0].vI[1] = 5; F[0].vI[2] = 6; F[0].vI[3] = 7;F[1].SetNum(4); F[1].vI[0] = 0; F[1].vI[1] = 3; F[1].vI[2] = 2; F[1].vI[3] = 1;F[2].SetNum(4); F[2].vI[0] = 0; F[2].vI[1] = 4; F[2].vI[2] = 7; F[2].vI[3] = 3;F[3].SetNum(4); F[3].vI[0] = 1; F[3].vI[1] = 2; F[3].vI[2] = 6; F[3].vI[3] = 5;F[4].SetNum(4); F[4].vI[0] = 2; F[4].vI[1] = 3; F[4].vI[2] = 7; F[4].vI[3] = 6;F[5].SetNum(4); F[5].vI[0] = 0; F[5].vI[1] = 1; F[5].vI[2] = 5; F[5].vI[3] = 4;
}void CTestView::InitParameter()//透视变换参数初始化
{	k[1] = sin(PI*Theta / 180);k[2] = sin(PI*Phi / 180);k[3] = cos(PI*Theta / 180);k[4] = cos(PI*Phi / 180);k[5] = k[2] * k[3];k[6] = k[2] * k[1];k[7] = k[4] * k[3];k[8] = k[4] * k[1];
}void CTestView::PerProject(CP3 P)//透视变换
{CP3 ViewP;ViewP.x = P.x*k[3] - P.z*k[1];ViewP.y = -P.x*k[8] + P.y*k[2] - P.z*k[7];ViewP.z = -P.x*k[6] - P.y*k[4] - P.z*k[5] + R;ScreenP.x = d * ViewP.x / ViewP.z;ScreenP.y = d * ViewP.y / ViewP.z;
}void CTestView::DrawObject(CDC* pDC)//绘制立方体线框
{CP2 t;CLine *line = new CLine;for (int nFace = 0; nFace < 6; nFace++){for (int nEdge = 0; nEdge < F[nFace].vN; nEdge++){PerProject(P[F[nFace].vI[nEdge]]);if (nEdge == 0){line->MoveTo(pDC, ScreenP);t = ScreenP;}else{line->LineTo(pDC, ScreenP);}}line->LineTo(pDC, t);}delete line;
}void CTestView::OnRButtonDown(UINT nFlags, CPoint point)
{// TODO: 在此添加消息处理程序代码和/或调用默认值R = R - 100;InitParameter();//更新参数Invalidate(FALSE);//重新绘制窗口CView::OnRButtonDown(nFlags, point);//此行为最后一行
}void CTestView::OnTwopoint()//工具条中二点透视按钮的响应函数
{// TODO: 在此添加命令处理程序代码KillTimer(1);bPlay = FALSE;Phi = 45; Theta = 0;InitParameter();Invalidate(FALSE);
}void CTestView::OnThreepoint()//工具条中三点透视按钮的响应函数
{// TODO: 在此添加命令处理程序代码KillTimer(1);bPlay = FALSE;Phi = 45; Theta = 45;InitParameter();Invalidate(FALSE);
}

第三次上机

主要内容：Cohen-Sutherland直线段裁剪算法

void CTestView::Cohen()//Cohen-Sutherland算法，实现函数体
{CP2 p;EnCode(P[0]);EnCode(P[1]);while (P[0].rc != 0 || P[1].rc != 0){if (0 != (P[0].rc&P[1].rc)){PtCount = 0;return;}UINT RC = P[0].rc;if (P[0].rc == 0) RC = P[1].rc;if (RC & LEFT){p.x = Wxl;p.y = P[0].y + (P[1].y - P[0].y)*(p.x - P[0].x) / (P[1].x - P[0].x);}else if (RC & RIGHT){p.x = Wxr;p.y = P[0].y + (P[1].y - P[0].y)*(p.x - P[0].x) / (P[1].x - P[0].x);}else if (RC & BOTTOM){p.y = Wyb;p.x = P[0].x + (P[1].x - P[0].x)*(p.y - P[0].x) / (P[1].x - P[0].x);}else if (RC & TOP){p.y = Wyt;p.x = P[0].x + (P[1].x - P[0].x)*(p.y - P[0].y) / (P[1].y - P[0].y);}if (RC == P[0].rc){EnCode(p);P[0] = p;}else{EnCode(p);P[1] = p;}}
}void CTestView::EnCode(CP2 &pt)//端点编码函数, 实现函数体
{pt.rc = 0;if (pt.x < Wxl){pt.rc = pt.rc | LEFT;}else if (pt.x > Wxr){pt.rc = pt.rc | RIGHT;}if (pt.y < Wyb){pt.rc = pt.rc | BOTTOM;}else if (pt.y > Wyt){pt.rc = pt.rc | TOP;}
}

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