vc绘图工具、颜色和绘图函数

1、画笔

有两种形式创建画笔

一是直接通过GetStockObject()函数来调用

二是通过创建画笔来调用

 HPEN CreatePen(
  int fnPenStyle,    // pen style
  int nWidth,        // pen width
  COLORREF crColor   // pen color
);
 

创建画笔后必须调用SelectObject函数来将起选入设备环境；

删除画笔可通过DeleteObject 函数来实现；

2、画刷

创建画刷

一是通过GetStockObject函数来调用

二是通过调用CreateSolidBrush 和CreateHatchBrush来创建画刷

HBRUSH CreateSolidBrush(   COLORREF crColor   // brush color value );

HBRUSH CreateHatchBrush(   int fnStyle,      // hatch style   COLORREF clrref   // color value ); 

3、颜色

通过RGB函数来实现；

4、常用的绘图函数

设置画笔当前的位置函数MoveToEx

BOOL MoveToEx(   HDC hdc,          // handle to device context   int X,            // x-coordinate of new current position   int Y,            // y-coordinate of new current position   LPPOINT lpPoint   // pointer to old current position ); 

从当前位置向指定坐标点画直线的函数LineTo

BOOL LineTo(   HDC hdc,    // device context handle   int nXEnd,  // x-coordinate of line's ending point   int nYEnd   // y-coordinate of line's ending point );

 从当前位置开始，依次用线段连接lpPoints中指定各点的函数Polyline

BOOL Polyline(   HDC hdc,            // handle to device context   CONST POINT *lppt,  // pointer to array containing endpoints   int cPoints         // number of points in the array ); 

椭圆弧线Arc

BOOL Arc(   HDC hdc,         // handle to device context   int nLeftRect,   // x-coord of bounding rectangle's upper-left corner   int nTopRect,    // y-coord of bounding rectangle's upper-left corner   int nRightRect,  // x-coord of bounding rectangle's lower-right corner   int nBottomRect, // y-coord of bounding rectangle's lower-right corner   int nXStartArc,  // first radial ending point   int nYStartArc,  // first radial ending point   int nXEndArc,    // second radial ending point   int nYEndArc     // second radial ending point ); 

画一个饼图并用当前的画刷进行填充Pie

BOOL Pie(   HDC hdc,         // handle to device context   int nLeftRect,   // x-coord of bounding rectangle's upper-left corner   int nTopRect,    // y-coord of bounding rectangle's upper-left corner   int nRightRect,  // x-coord of bounding rectangle's lower-right corner   int nBottomRect, // y-coord of bounding rectangle's lower-right corner   int nXRadial1,   // x-coord of first radial's endpoint   int nYRadial1,   // y-coord of first radial's endpoint   int nXRadial2,   // x-coord of second radial's endpoint   int nYRadial2    // y-coord of second radial's endpoint );  

画一个矩形，并填充Rectangle

BOOL Rectangle(   HDC hdc,         // handle to device context   int nLeftRect,   // x-coord of bounding rectangle's upper-left corner   int nTopRect,    // y-coord of bounding rectangle's upper-left corner   int nRightRect,  // x-coord of bounding rectangle's lower-right corner   int nBottomRect  // y-coord of bounding rectangle's lower-right corner ); 

画一个椭圆并填充Ellipse

BOOL Ellipse(   HDC hdc,        // handle to device context   int nLeftRect,  // x-coord of bounding rectangle's upper-left corner   int nTopRect,   // y-coord of bounding rectangle's upper-left corner   int nRightRect, // x-coord of bounding rectangle's lower-right corner   int nBottomRect // y-coord of bounding rectangle's lower-right corner ); 

画一个多边形，并进行填充Polygon

BOOL Polygon(   HDC hdc,                // handle to device context   CONST POINT *lpPoints,  // pointer to polygon's vertices   int nCount              // count of polygon's vertices ); 

InvalidateRect 函数的作用是刷新用户区，（使区域无效）