画画的函数_GDI

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画画的函数

创建画笔画笔用来绘制对象的轮廓或简单线条HPEN pen = NULL;pen = GetStockObject(WHITE_PEN);//创建画笔

【原型】HGDIOBJ GetStockObject(int fnObject);

fnObject的常用值包括BLACK_PENWHITE_PENNULL_PEN//不可见

BLACK_BRUSHWHITE_BRUSHDKGRAY_BRUSHGRAY_BRUSHLTGRAY_BRUSHNULL_BRUSH//不可见HOLLOW_BRUSH//不可见

pen = CreatePen(PS_SOLID, 1, RGB(255, 0, 0);

【原型】HPEN CreatePen(int fnPenStyle, int nWidth, COLORREF crColor);

fnPenStyle的常用值包括PS_NULL //不可见PS_SOLID//实线PS_DASH //虚线PS_DOT //点PS_DASHDOT //点划线PS_DASHDOTDOT//双点划线

HDC hdc;HPEN blue_pen = CreatePen(PS_SOLID, 1, RGB(0, 0, 255) );HPEN old_pen = NULL;old_pen = SelectObject(hdc, blue_pen);//旧的画笔可以一直存着备用//drawing sth.

SelectObject(hdc, old_pen);//将任何 GDI对象选进图形设备描述表内【原型】HGDIOBJ SelectObject(HDC hdc, HGDIOBJ hgdiobj);DeleteObject(blue_pen);//销毁对象【原型】BOOL DeleteObject(HGDIOBJ hobject);

创建画刷HBRUSH brush = NULL;brush = CreateSolidBrush(RGB(0, 0, 255) );//创建实心的画刷【原型】HBRUSH CreateSolidBrush(COLORREF crColor);

brush = CreateHatchBrush(HS_CROSS, RGB(0, 0, 255) );//创建带阴影线的画刷【原型】HBRUSH CreateHatchBrush（int fnStyle, COLORREF crColor);

fnStyle的常用值包括HS_BDIAGONAL //HS_CROSS //HS_DIAGCROSS //HS_FDIAGONAL //HS_HORIZONTAL //水平阴影线HS_VERTICAL //垂直阴影线

绘制点【原型】COLORREF SetPixel(HDC hdc, int x, int y, COLORREF crColo0r);绘制线段【原型】BOOL MoveToEx(HDC hdc, int x, int y, LPPOINT lpPoint); BOOL LineTo (HDC hdc, int xEnd, int yEnd);POINT 结构: LONG x 和 LONG y【实例】MoveToEx(hdc, 0, 0, NULL); LineTo(hdc, 100, 100);

所谓的MoveToEx()---LineTo() 技术

绘制矩形【原型】BOOL Rectangle(HDC hdc, int nLeftRect , int nTopRect, int nRightRect, int n Bottom Rect);用画笔绘制边界，用画刷填充内部

【原型】int FillRect(HDC hdc, CONST RECT *lprc, HBRUSH hbr);//仅仅填充内部，也就是不用到画笔【实例】RECT rect= {0, 0, 100, 100}; FillRect(hdc, &rect, CreateSolidBrush(RGB(0, 0, 255) );【技巧】使用临时画刷，创建不需DeleteObject()的临时对象

【原型】int FrameRect(HDC hdc, CONST RECT *lprc, HBRUSH hbr);//绘制仅有边界的中空矩形，也不使用画笔（奇妙）【实例】......

绘制圆【原型】BOOL Ellipse(HDC hdc, int nLeftRect, int nTopRect, int nRightRect, int nBottomRect);

绘制多边形【原型】BOOL Polygon(HDC hdc, CONST POINT *lpPoints, int nCount);【实例】POINT poly[3]= {p0x, p0y, p1x, p1y, p2x, p2y}; Polygon(hdc, poly, 3);

//***********************************************************小技巧#define WINDOW_WIDTH GetSystemMetrics(SM_CXSCREEN)#define WINDOW_HEIGHT GetSystemMetrics(SM_CYSCREEN)//返回屏幕的宽度和高度

Sleep(500);//