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）