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1、Java绘图功能函数详细学习ThedrawingfunctionofJAVAisveryrich・Drawingincludesfont,colorandgraphics・Wewilldiscussittechnically.First,aboutthedrawingmechanismofJAVA・AgraphicJAVAcomporient,smalltextbox,label,toaFRAME,aDIALOG,thereisadedicateddisplayfunctionofitsinterface,thefunctionnameisfixed:paint,itsproto
2、type:public(Graphicsg){voidpaint}whenthecomponentsize,location,andcomponentcontentschange,thefunctionisresponsibleforgeneratingnewgraphicalinterfacedisplays・Sincethefunctioncanbeinheritedbyaquiltclass,theinheritedsubclasshastheabilitytomodifythefunction.Ifthechilddoesnotappearinthefunction,th
3、enitsbehaviorisfullyinheritedfromtheparentclass・Whetherornotanewcontentisaddedtothecomponent,whetherachangeinsizeoccursorashiftoccurs,theparentclassmusthaveadedicatedthreadtorepresentthecomponentinterfaceafterthechange.Thepaintfunctionisautomaticallymaintainedbytheparentclass,andifthesubclass
4、overloadsthefunction,youmustmaintainallofyourinterfacedisplayyourself.Two,setthebrushcolor1,colorcommonsenseAnycoloriscomposedofthreeprimarycolors(RGB),JAVAsupports224bitcolor,thatis,redandgreencomponentscanbevaluedbetween0.・255・Here,first,learntheconstantsinclassColorColorinaJAVA:Public,fina
5、l,static,Color,black二new,Color(0,0,0);Public,final,static,Color,blue二new,Color(0,0255);Colorconstructor:PublicColor(int,R,int,G,int,B);Forexample:ifyouwanttoconstructagrayobject,usethefollowingsentences:Colorgray二newColor(205205205);1,setthebrushcolorsyntaxG.setColor(color);//colorisaColorobj
6、ectEverytimethecolorchanges,itaffectsallthefollowingdrawingstatements,whichalwaysaffectthesetColorfunctionagainandreplaceitwithanewcolor・2,usetheJColorChoosercomponenttoselectthecolor,JAVAhasadefinedcolorpicker,throughsimplesyntax,wecantuneoutthewindow,fromwhichtochoosetheirfavoritecolor・Thef
7、ollowingexampleselectsthecolorthroughthecolorpickerandsetstheselectedcolorasthebackgroundcoloroftheform・(1)JColorChooserintroduction,theJColorChooser(showDialog)methodoftheColorcomporientallowstheusertoselectacolorfromthepop-upwindowandpassit
