睿豐德科技 專注RFID識別技術和條碼識別技術與管理軟件的集成項目。質量追溯系統、MES系統、金蝶與條碼系統對接、用友與條碼系統對接

下面有三個繪圖函數需要一個指向矩形結構的指針：

FillRect(hdc,&rect,hbursh);//填充

FrameRect(hdc,&rect,hbrush);//掏空

InvertRect(hdc,&rect);//內部取反

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1. case WM_PAINT:  
2.             hdc=BeginPaint(hwnd,&ps);  
3.             //GetClientRect(hwnd,&rect);  
4.               
5.             //hrgn=CreateRectRgn(100,100,300,300);  
6.             //hbrush=CreateSolidBrush(RGB(255,0,0));  
7.             //FillRgn(hdc,hrgn,hbrush);  
8.             //InvertRgn(hdc,hrgn);//取反  
9.             //FrameRgn(hdc,hrgn,hbrush,0,0);  
10.   
11.               
12.             r1.left=100;  
13.             r1.top=100;  
14.             r1.right=200;  
15.             r1.bottom=200;  
16.             hbrush=CreateSolidBrush(RGB(255,0,0));//創建畫刷  
17.             FillRect(hdc,&r1,hbrush);  
18.   
19.             r2.left=200;  
20.             r2.top=100;  
21.             r2.right=300;  
22.             r2.bottom=200;  
23.             FrameRect(hdc,&r2,hbrush);  
24.   
25.             r3.left=300;  
26.             r3.top=100;  
27.             r3.right=400;  
28.             r3.bottom=200;  
29.             InvertRect(hdc,&r3);  
30.   
31.             EndPaint(hwnd,&ps);  
32.             return 0;  

下面還有八個關于矩形的操作：

OffsetRect(&rect,x,y) 將矩形移動 InflateRect(&rect,x,y) 增大縮小矩形的尺寸 SetRectEmpty(&rect) 把矩形結構各字段設置為0 CopyRect(&DestRect,&ScrRect) 將一個矩形結構復制到另一個矩形結構 IntersectRect(&destRect,&SrcRect1,&SrcRect2) 獲取兩個矩形的交集 UnionRect(&DestRect,&SrcRect1,&SrcRect2) 獲取兩個矩形的并集 bEmpty=IsRectEmpty(&Rect) 判斷矩形是否為空 bInRect=PtInRect(&rect,point) 判斷點是否在矩形內部

 

區域跟矩形一樣，有以下四個繪圖函數

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1. FillRgn(hdc,hrgn,hbrush);  
2. FrameRgn(hdc,hbrush,xFrame,yFrame);  
3. InvertRgn(hdc,hrgn);  
4. PaintRgn(hdc,hrgn);  

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1. DeleteObject(hrgn);  

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1. SelectObject(hdc,hrgn)=SelectClipRgn(hdc,hrgn);  

使得矩形，區域有效和無效的函數

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1. InvalidateRect       ValidateRect  
2. InvalidateRgn        ValidateRgn  

下面是簡單的例子：

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1. case WM_PAINT:  
2.             hdc=BeginPaint(hwnd,&ps);  
3.             //GetClientRect(hwnd,&rect);  
4.               
5.             //hrgn=CreateRectRgn(100,100,300,300);  
6.             //hbrush=CreateSolidBrush(RGB(255,0,0));  
7.             //FillRgn(hdc,hrgn,hbrush);  
8.             //InvertRgn(hdc,hrgn);//取反  
9.             //FrameRgn(hdc,hrgn,hbrush,0,0);  
10.   
11.               
12.             r1.left=100;  
13.             r1.top=100;  
14.             r1.right=200;  
15.             r1.bottom=200;  
16.             hbrush=CreateSolidBrush(RGB(255,0,0));//創建畫刷  
17.             //FillRect(hdc,&r1,hbrush);  
18.   
19.             r2.left=150;  
20.             r2.top=100;  
21.             r2.right=250;  
22.             r2.bottom=200;  
23.             //FrameRect(hdc,&r2,hbrush);  
24.   
25.             IntersectRect(&r3,&r1,&r2);//r1,r2矩形取交集，存放在r3  
26.             FillRect(hdc,&r3,hbrush);  
27.             flag=(int)IsRectEmpty(&r3);//判斷矩形是否為空  
28.             TextOut(hdc,300,300,szBuffer,wsprintf(szBuffer,TEXT("%d"),flag));  
29.   
30.             EndPaint(hwnd,&ps);  
31.             return 0;  

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1. hrgn=CreateRectRgn(xleft,ytop,xright,ybottom);  
2. hrgn=CreateRectRgnIndirect(&rect);  
3. hrgn=CreateEllipticRgn(xleft,ytop,xright,ybottom);  
4. hrgn=CreatePolygonRgn(&point,icount,ipolyFillMode);  

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