To implement graphics, draw lines, parks and arcs, line clipping, area filling and other functions 1. For a straight line, just know the starting point and the destination. Press the mouse in the working interval (that is, select the starting point) and drag it to another to loosen (the endpoint) to get the straight line. 2. Painting circle need center coordinates and radius, and the starting Angle and ending Angle, as for the experimental requirements of 1/4 circular arc, can set the starting Angle = 0, termination Angle = 45, if you want to draw the entire arc starting Angle and ending Angle of 0 and 360, respectively. 3. Ellipse parameters need more with ellipse center coordinates, long axis and short axis, the Angle of the long axis and the X axis is, and start centrifugal Angle and termination of centrifugal Angle, to draw the elliptic or part of the need to control the start and stop the centrifugal Angle. Similar to the picture arc, the specific description source program also has. 4. Straight cut the functions are: given any lines (controlled by two points), for any rectangular, fell in the inside of the rectangle section cut a straight line, but the program doesn't really cut of this part, just put it in red, that is to say, the red part is a part of the rectangular cut out. 5. For area filling function, given an arbitrary polygon using polygon vertices (program) control algorithm with edge pixel invert concrete intersection to the right (that is, the scan lines see the book or the courseware), calls for filling out recursive functions. As the program runs, the scan line is scanned from top to bottom

Vcad
....\ArcDialog.cpp
....\ArcDialog.h
....\AreafillDialog.cpp
....\AreafillDialog.h
....\DCVcadCutDialogB.cpp
....\DCVcadCutDialogB.h
....\Debug
....\EllipseDialog.cpp
....\EllipseDialog.h
....\MainFrm.cpp
....\MainFrm.h
....\ReadMe.txt
....\res


....\...\Vcad.rc2

....\resource.h
....\StdAfx.cpp
....\StdAfx.h
....\Vcad.aps
....\Vcad.clw
....\Vcad.cpp
....\Vcad.dsp
....\Vcad.dsw
....\Vcad.h
....\Vcad.ncb
....\Vcad.opt
....\Vcad.plg
....\Vcad.rc
....\Vcad.sln
....\Vcad.vcproj
....\Vcad.vcproj.SHENLAN.shengsiwodi.user
....\VcadBezierDialog.cpp
....\VcadBezierDialog.h
....\VcadCutDialog.cpp
....\VcadCutDialog.h
....\VcadCutDialogB.cpp
....\VcadCutDialogB.h
....\VcadDoc.cpp
....\VcadDoc.h
....\VcadView.cpp
....\VcadView.h
....\VCutDialog.cpp
....\VCutDialog.h

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