画粗实线时，怎样使直线的端点是绝对直角的？

Question

画粗实线时
放大后发现
直线的端点是圆头的
怎样使之为绝对方形的端点呢？

Answer 1

PS_ENDCAP_ROUND 结束处为圆形
PS_ENDCAP_SQUARE 结束处为方形画笔的风格或上PS_ENDCAP_SQUARE 结束处为方形

Answer 2

LOGBRUSH lb;
lb.lbStyle=BS_SOLID;
lb.lbColor=RGB(0,255,0);
CPen pen(PS_GEOMETRIC|PS_SOLID|PS_ENDCAP_SQUARE|PS_JOIN_BEVEL,4,&lb);
CPen *old=pDC->SelectObject(&pen);
pDC->BeginPath();
pDC->MoveTo(300,300);
pDC->LineTo(400,400);
pDC->CloseFigure();
pDC->EndPath();
pDC->StrokePath();
pDC->SelectObject(old);
pen.DeleteObject();

Answer 3

我试了一下，你的要求估计要用
PS_ENDCAP_FLAT

Answer 4

其实我的本意是利用粗实线画矩形将下列代码加入到OnDraw中：
pDC->SetMapMode(MM_HIMETRIC);
pDC->SetWindowOrg(-10000,10000);

LOGBRUSH lb;
lb.lbStyle=BS_SOLID;
lb.lbColor=RGB(0,255,0);
CPen pen(PS_GEOMETRIC|PS_SOLID|PS_ENDCAP_SQUARE|PS_JOIN_BEVEL,400,&lb);
CPen *old=pDC->SelectObject(&pen);
pDC->BeginPath();
pDC->MoveTo(100,100);
pDC->LineTo(100,5000);
pDC->LineTo(5000,5000);
pDC->EndPath();
pDC->StrokePath();
pDC->SelectObject(old);
pen.DeleteObject();发现矩形的外轮廓仍旧不是直角的

Answer 5

//pDC->BeginPath();
pDC->MoveTo(100,100);
pDC->LineTo(100,5000);
pDC->LineTo(5000,5000);
//pDC->EndPath();
//pDC->StrokePath();

Answer 6

嗯
果真好用但是如果用pDC->Polygon画封闭的多边形就不好用了 pDC->SetMapMode(MM_HIMETRIC);
pDC->SetWindowOrg(-10000,10000);

LOGBRUSH lb;
lb.lbStyle=BS_SOLID;
lb.lbColor=RGB(0,255,0);
CPen pen(PS_GEOMETRIC|PS_SOLID|PS_ENDCAP_SQUARE|PS_JOIN_BEVEL/*|PS_ENDCAP_FLAT*/,400,&lb);
CPen *old=pDC->SelectObject(&pen);
pDC->MoveTo(100,100);
pDC->LineTo(100,5000);
pDC->LineTo(5000,5000); CPoint pts[4];
pts[0].x=800;
pts[0].y=100;
pts[1].x=800;
pts[1].y=4000;
pts[2].x=4000;
pts[2].y=4000;
pts[3].x=4000;
pts[3].y=100;

pDC->Polygon(pts, 4);

pDC->SelectObject(old);
pen.DeleteObject();

Answer 7

是的
我是想问一下Polygon画出的边不是直角
应该怎么处理呢？

Answer 8

LOGBRUSH lb;
lb.lbStyle=BS_SOLID;
lb.lbColor=RGB(0,255,0);
CPen pen(PS_GEOMETRIC|PS_SOLID|PS_ENDCAP_SQUARE|PS_JOIN_BEVEL,300,&lb);
CPen *old=pDC->SelectObject(&pen);
float fOut;
CPoint pt[5];
pt[0].x = 100;
pt[0].y = 100; pt[1].x = 800;
pt[1].y = 100;

pt[2].x = 800;
pt[2].y = 500; pt[3].x = 100;
pt[3].y = 800; pt[4].x = 100;
pt[4].y = 100; pDC->Polygon(pt,5);
pDC->SelectObject(old); 没问题的，边角都是直角，你在好好看看你的

Answer 9

LOGBRUSH lb;
lb.lbStyle=BS_SOLID;
lb.lbColor=RGB(0,255,0);
CPen pen(PS_GEOMETRIC|PS_SOLID|PS_ENDCAP_SQUARE|PS_JOIN_BEVEL,300,&lb);
CPen *old=pDC->SelectObject(&pen);
float fOut;
CPoint pt[5];
pt[0].x = 100;
pt[0].y = 100;pt[1].x = 800;
pt[1].y = 100;pt[2].x = 800;
pt[2].y = 500;pt[3].x = 100;
pt[3].y = 800;pt[4].x = 100;
pt[4].y = 100;pDC->Polygon(pt,5);
pDC->SelectObject(old);
画出的外轮廓不是直角啊

Answer 10

将CPen 改为如下就可以了
CPen pen(PS_GEOMETRIC|PS_SOLID|PS_ENDCAP_SQUARE|PS_JOIN_MITER,400,&lb);