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1、c++画图（C++drawing）Fortunately,whenyouwriteatypicalWindowsformprogram,thedrawingandeffectoftheformandcontrolarenottobeconsideredinparticular.Whyisthat?Byusingthe.Netframework,developerscandragaseriesofcontrolstotheform,andwritesomesimplecodeassociatedwiththeeventinIDEandaccord
2、ingtoF5,acompleteprogramformwasborn!Allthecontrolsdrawthemselves,thesizeandzoomoftheformorcontrolarefreelyadjusted.Hereisoftenused,andneedtodrawalittleattentionisthecontroleffect.Games,customchartcontrols,andscreensaverprogrammingrequireprogrammerstowriteadditionalcodetoresp
3、ondtoPaintevents.ThisarticlefocusesontheWindowsformdevelopersandhelpsthemtousesimpledrawingtechniquesintheapplicationprogrammingprocess.Firstofall,we'lldiscusssomebasicdrawingconcepts.Whoisresponsibleforthedrawingoperation?HowdoesaWindowsformprogramknowwhentodraw?Wherearethe
4、placeswherethedrawingcodeislocated?Afterthat,you'llalsointroducethedualbufferingtechniqueforimagerendering,whereyou'llseehowitworks,andhowtoimplementthealternationbetweenthecachedandactualdisplayedimagesthroughamethod.Finally,wewillexplorethe"intelligentinvalidarea",infact,j
5、ustredraworclearinvalidpartsontheapplicationform,speedingupthedisplayandresponsespeedoftheprogram.Itishopedthattheseconceptsandtechniquescanguidereaderstoreadthisarticle,andhelptodevelopWindowsformprogramsfasterandmoreefficiently.WindowsformsusetheGDI+imageengine,andallofthe
6、drawingcodeinthisarticlewillinvolveusingthemanaged.NetframeworktomanipulateandusetheWindowsGDI+imageengine.Althoughthisarticleisusedforbasicformdrawingoperations,italsoprovidesfast,effectiveandhelpfultechniquestoimproveprogramperformance.Sobeforereadingthroughthisarticle,iti
7、srecommendedthatthereaderhaveabasicunderstandingofthe.Netframework,includingWindowsformeventhandling,simpleGDI+objectssuchasLine,Pen,andBrush.BefamiliarwithVisualBasic.NetorC#programminglanguage.conceptTheWindowsapplicationisresponsiblefortheirowndrawing,whenaformis"notclean
8、",thatistosaytheformchangedinsize,orbyotherproceduresformpartofcover,orreco
