Win32 Windows Programming Ten

A Windows Paint

1 Drawing Drawing

1.1 How graphics are plotted

Gets the handle to the paint, device-descriptive descriptor (DC). Use the corresponding Paint API. Drawing graphics on the device

1.2 Colors

RGB, 8 bits per color, 24-bit color

32-bit color: The number of colors 24 is color, and the extra 8 bits represent grayscale.

16-bit: The number of colors is 2 of 16 times.

Under the Win32. The definition of color uses COLORREF. RGB macro-defined color

COLORREF ncolor = RGB (0, 0, 0); Black

COLORREF Ncolor = RGB (255, 255, 255); White

COLORREF Ncolor = RGB (255, 255, 255); Red

Get RGB tri-color from one color value:

int nred = Getrvalue (DWord RGB)

int ngreen = Getgvalue (DWord RGB)

int nblue = Getbvakue (DWord RGB)

1.3-point drawing and acquisition

Drawing: SetPixel

colorref setpixel (  hdc  hdc,    //Handle to DC  int  Nxpos ,   X-coordinate of Pixel  int  nypos,   //Y-coordinate of Pixel

  COLORREF crcolor//color value

);

Get: GetPixel

colorref GetPixel (  hdc  hdc,    //Handle to DC  int  nxpos,   //X-coordinate of pixel  int  nypos   //Y-coordinate of Pixel);

1.4 Drawing of a line

Movetoex move the current point to the specified position

LineTo to the specified position before drawing from the current point

1.5 drawing of Arcs

Arc and ANGLEARC provide different ways to draw arcs

BOOL Anglearc (  hdc  hdc,            //Handle to device context  int  X ,               X-coordinate of Circle ' s Center Center x coordinate   int  Y,              //Y-coordinate of Circle ' s Center Center y-coordinate   DWORD  dwradius,        radius of the park   FLOAT  estartangle,  //ARC ' s start angle  start angle   FLOAT  Esweepangle   //ARC ' s sweep angle  angle  );

How arcs are split

int Setarcdirection (

  hdc  hdc,           //Handle to device context  int  arcdirection   //New arc direction);

  BOOL ARC (hdc   hdc  , //handle to device Context
   
     int  
     nleftrect  
    , //X-coord of rectangle ' s upper-left corner 
     Int 
     ntoprect  
    , //Y-coord of rectangle ' s upper-left corner 
     int  
     nrightrect< /em> , //X-coord of rectangle ' s lower-right corner  int   nbottomrect  , //Y-coord of rectangle ' s lower-right corner bounding rectangle coordinates  int   nxstartarc  , //X-coord of first radial ending point  int   nystartarc  , //Y-coord of first Radial ending point  int   nxendarc  , //X-coord of second radial ending point  int   Nyendarc //Y-coord of second radial ending point );  
   

16 percent-wire

BOOL Polyline (  hdc  hdc,            //Handle to device context  CONST point   *lppt,  //array of endpoints  int  cpoints         Number of points in array);

BOOL PolylineTo (  hdc  hdc,            //Handle to device context  CONST Point *lppt,  //array of points  DWORD   Ccount        //number of points in array); similar to Polyline, before drawing polyline. Draws a line from the current point to the first vertex of the polyline using LineTo

BOOL polypolyline (  hdc  hdc,                      //Handle to device context  CONST Point  *lppt,            //   array of points all point arrays   CONST DWORD   *lpdwpolypoints,  //array of values    per set of   points  DWORD ccount                  Number of entries in Values array group );

1.7 Bizer Curve

BOOL polybezier (  hdc  hdc,            //Handle to device context  lppt ,    Endpoints and control points points Group   DWORD  cpoints       //Count of endpoints and control points Number of points

);

1.8 Fillet Rectangle

BOOL roundrect (  hdc  hdc,         //Handle to DC  int  nleftrect,    //X-coord of Upper-left corner of rectangle  int  ntoprect,    // Y-coord of Upper-left corner of rectangle  int  nrightrect,  //X-coord of Lower-right corner of rectangle  int  nbottomrect//Y-coord of Lower-right Corner of rectangle  int  nwidth,      //width of ellipse the ellipse that generated the fillet   int  nheight      //height of ellipse the height of the ellipse that generated the fillet );

1.9 Rectangle

BOOL Rectangle (  hdc  hdc,         //Handle to DC  int  nleftrect,    //X-coord of Upper-left corner of rectangle  int  ntoprect,    // Y-coord of Upper-left corner of rectangle  int  nrightrect,  //X-coord of Lower-right corner of rectangle  int  nbottomrect  //Y-coord of Lower-right corner of Rectangle);

1.10 Ellipse

BOOL Ellipse (  hdc  hdc,        //Handle to DC  int  nleftrect,   //X-coord of Upper-left corner of rectangle  int  ntoprect,   // Y-coord of Upper-left corner of rectangle  int  nrightrect//X-coord of Lower-right Corner of rectangle  int  nbottomrect //Y-coord of Lower-right corner of Rectangle);

1.11 Pie Pie

BOOL Pie (  hdc  hdc,         //Handle to DC  int  nleftrect,   //X-coord of Upper-left corner of rectangle  int  ntoprect,    //Y-coord of Upper-left corner of rectangle  int  nrightrect,  //X-coord of Lower-right Corner of rectangle  int  nbottomrect//Y-coord of Lower-right corner of rectangle< c24>  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);

1.12 Strings

BOOL Chord (  hdc  hdc,         //Handle to DC  int  nleftrect,    //X-coord of Upper-left corner of rectangle  int  ntoprect,    // Y-coord of Upper-left corner of rectangle  int  nrightrect,  //X-coord of Lower-right corner of rectangle  int  nbottomrect//Y-coord of Lower-right Corner of rectangle  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);

1.13 Multiple variants

BOOL Polygon (  hdc  hdc,                //Handle to DC  CONSTPoint*  lpPoints,  //polygon vertices  int  ncount              //Count of Polygon vertices);

2 GDI Paint objects-brushes

2.1 Effects of brushes

Ability to control the color, style, width of lines

2.2 Use of brushes

Create a brush

CreatePen

A brush that can be used by the current DC

SelectObject

Draw a graphic

Remove a brush from the current DC

SelectObject

destroying brushes

DeleteObject

3 GDI drawing objects-paint brushes

3.1 Effect of brush

Fills a closed shape, including the style color

3.2 Use of paint brushes

Create a paint brush

Createsilidbrush

Createhatchbrush

A brush that can be used by the current DC

SelectObject

Draw a graphic

Remove Paint brush

SelectObject

Destroy paint brushes

DeleteObject

Win32 Windows Programming Ten