容易的win32画图程序

简单的win32画图程序

刚开始学习windows编程，弄了个画图的程序，艰难的入门中 ……欢迎提点

界面

点击菜单选择不同的画笔 ，鼠标按下拉动到松开的距离为半径画出图形。

五边形的坐标赋值

case myPentagon:
		r=(int)sqrt(pow((double)(PointEnd.x-m_PointBegin.x),2)+pow((double)(PointEnd.y-m_PointBegin.y),2));
		apt[0].x=m_PointBegin.x;
		apt[0].y=m_PointBegin.y-r;
		apt[1].x=(LONG)(m_PointBegin.x-r*sin(72*PI/180));
		apt[1].y=(LONG)(m_PointBegin.y-r*cos(72*PI/180));
		apt[2].x=(LONG)(m_PointBegin.x-r*sin(36*PI/180));
		apt[2].y=(LONG)(m_PointBegin.y+r*cos(36*PI/180));
		apt[3].x=(LONG)(m_PointBegin.x+r*sin(36*PI/180));
		apt[3].y=(LONG)(m_PointBegin.y+r*cos(36*PI/180));
		apt[4].x=(LONG)(m_PointBegin.x+r*sin(72*PI/180));
		apt[4].y=(LONG)(m_PointBegin.y-r*cos(72*PI/180));
		dc.Polygon(apt,5);
		break;

windows窗口下五边形坐标公式

0（x，y-r）    1（x-rsin72°， y-rcos72° ）    2 (x-rsin36°,y+rcos36°）

                       3（x+rsin36°，y+rcos36°）    4（x+rsin72°,y-rcos72°）

五角星的坐标和五边形一样只不过画线的顺序变了。

case myStar:
		r=(int)sqrt(pow((double)(PointEnd.x-m_PointBegin.x),2)+pow((double)(PointEnd.y-m_PointBegin.y),2));
		apt[0].x=m_PointBegin.x;
		apt[0].y=m_PointBegin.y-r;
		apt[3].x=(LONG)(m_PointBegin.x-r*sin(72*PI/180));
		apt[3].y=(LONG)(m_PointBegin.y-r*cos(72*PI/180));
		apt[1].x=(LONG)(m_PointBegin.x-r*sin(36*PI/180));
		apt[1].y=(LONG)(m_PointBegin.y+r*cos(36*PI/180));
		apt[4].x=(LONG)(m_PointBegin.x+r*sin(36*PI/180));
		apt[4].y=(LONG)(m_PointBegin.y+r*cos(36*PI/180));
		apt[2].x=(LONG)(m_PointBegin.x+r*sin(72*PI/180));
		apt[2].y=(LONG)(m_PointBegin.y-r*cos(72*PI/180));
		dc.SetPolyFillMode(WINDING);
		dc.Polygon(apt,5);
		break;

其他简单的直接调用函数就可以画出来 。