C语言图像函数库详解docxWord下载.docx

C语言图像函数库详解docxWord下载.docx

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Lineto（）drawalinefunction

Linerel（）relativetothelinefunction

Setlinestyle（）

setsthelinefunction

Getlinesettings

（）getsthelinesettingfunction

Setwritemocle（）

setsthelinemodefunction

（3）thepolygon

function

Rectangle（）rectanglefunction

Thebar（）drawafunction

Bar3d（）drawthebarfunction

Drawpoly（）drawsapolygonfunction

（4）,circle,arcandcurvefunction

Getaspectratio（）obtainstheaspectratiofunction

Circle（）circlefunction

Arc（）todrawthearcfunction

Ellipse（）drawstheellipticarcfunction

Fillellipse（）drawstheellipticfunction

Thepieslice（）drawingsectorfunction

Sector（）drawstheellipticalsectorfunction

Thegetarccoords（）getsthearccoordinatefunction

（5）thefillingfunction

Setfillstyle（）setsthefillpatternandcolorfunction

Setfillpattern（）setstheuser'

spatternfunction

Floodfill（）fillsthecloseddomainfunction

Fillpoly（）fillsthepolygonfunction

Getfillsettings（）getsthefillsetfunction

Getfillpattern（）getstheuser'

spatternsettingfunction

（6）theimagefunction

Theimagesize（）imagestoresthesizefunction

Getimage（）savestheimagefunction

Theputimage（）outputimagefunction

4,graphicsandimagefunctions

Formanygraphicalapplications,linesandcurvesareveryuseful.Butsomegraphicscanonlybedrawnbymanipulatingindividualpixels・Ofcourse,ifyoudon'

tdrawpixels,youcan，toperatethelineandthefunctionofthecurve・Andbyusingpixelsonalargescale,theentireimagecanbesaved,written,erased,andstackedwiththeoriginalgraphicsonthescreen.

Putpixel（）drawsthepixelfunction

Function:

thefunctionputpixel（）drawsapixelonthescreeninthegraphicalmode・

Usage:

thefunctioniscalledvoidputpixel（intx,inty,intcolor）;

Description:

parameterx,yisthecoordinatesofpixels,coloristhecolorofthispixel,itcanbethecolorsymbolname,alsocanbetheintegercolorvalue・

Thecorrespondingheaderfileforthisfunctionisgraphics・h

Returnvalue:

no

Example:

drawaredpixelonthescreen（6,8）:

Putpixel（6,&

RED）;

functiongetpixel（）returnsapixelcolorvalue・

thisfunctioniscalledintgetpixel（intx,inty）;

parameterx,yispixelcoordinates・

Thereturnvalueofthefunctiondoesnotreflecttheactualcolorvalue,dependingonthesettingofthepalette（seethesetpalette（）function）・

Thecorrespondingheaderfileforthisfunctionisgraphic・h

returnapixelcolorvalue・

colorthepixelcolorofthe（8,6）dotonthescreen.

Color二getpixel（8,6）;

Therearethreefunctionsthatdrawaline,namelyline（）,lineto（）,linerel（）・Theselinesusingintegercoordinates,andrelativetothecurrentviewportgraphic,butnotbeinglimitedbytheviewport,ifviewportcuttingmarksclipistrue,thenthelinewillbeviewportmargintruncate;

Iftheclipisfalse,thelineistruncatedtothescreenlimiteveniftheendpointcoordinatesorthenewcurrentlocationareoutsidethevisualorscreenlimits・

Therearetwolineswideandseverallinestochoosefrom,oryoucandefinethelinepatternyourself・Thefollowingarethelinesandthelines・

line（）USESthecurrentdrawingcolor,lineandlinewidth,drawingastraightlinebetweenthetwopoints・

thisfunctioniscalledvoidline（intstartx,intstarty,intendx,intendy）;

parameterstartx,startyasastartingpointcoordinates,endx,endyascoordinates,before,duringandafterthefunctioncallgraphicsscreencursor（generallynotvisible）underthecurrentpositiondoesnotchange・

seetheexampleinthefunction60.Linerel（）・

lineto（）USESthecurrentdrawingcolor,lineandlinewidth,drawingalinefromthecurrentpositiontothespecifiedlocation.

thisfunctioniscalledvoidlineto（intx,inty）;

Note:

theparameterx,yisthecoordinateofthespecifiedpoint,andafterthefunctioncall,thecurrentpositionchangestothespecifiedpoint（x,y）・

thefunctionlinerel（）USESthecurrentdrawingcolor,lineandlinewidth,startingatthecurrentpositionanddrawingastraightlinefromthespecifiedhorizontalandverticaloffs