Canvas  AndroidDevelopers

490 479

ConstantvaluesusedasparameterstoquickReject()calls.

Restoreeverythingwhenrestore()iscalled(standardsaveflags).

Constructanemptyrastercanvas.

Constructacanvaswiththespecifiedbitmaptodrawinto.

Setthecliptothedifferenceofthecurrentclipandthespecifiedpath.

Setthecliptothedifferenceofthecurrentclipandthespecifiedrectangle,whichisexpressedinlocalcoordinates.

Setthecliptothedifferenceofthecurrentclipandtheshader.

Intersectthecurrentclipwiththespecifiedpath.

Modifythecurrentclipwiththespecifiedpath.

Intersectthecurrentclipwiththespecifiedrectangle,whichisexpressedinlocalcoordinates.

Modifythecurrentclipwiththespecifiedrectangle,whichisexpressedinlocalcoordinates.

Modifythecurrentclipwiththespecifiedrectangle.

Intersectthecurrentclipwiththespecifiedshader.

Preconcatthecurrentmatrixwiththespecifiedmatrix.

DisablesZsupport,preventinganyRenderNodesdrawnafterthispointfrombeingvisuallyreorderedorhavingshadowsrendered.

Filltheentirecanvas'bitmap(restrictedtothecurrentclip)withthespecifiedARGBcolor,usingsrcoverporterduffmode.

Drawthespecifiedarc,whichwillbescaledtofitinsidethespecifiedoval.

Drawthebitmapusingthespecifiedmatrix.

Drawthespecifiedbitmap,scaling/translatingautomaticallytofillthedestinationrectangle.

Drawthespecifiedbitmap,withitstop/leftcornerat(x,y),usingthespecifiedpaint,transformedbythecurrentmatrix.

Treatthespecifiedarrayofcolorsasabitmap,anddrawit.

LegacyversionofdrawBitmap(int[]colors,...)thattookintsforx,y

Drawthebitmapthroughthemesh,wheremeshverticesareevenlydistributedacrossthebitmap.

Drawthespecifiedcircleusingthespecifiedpaint.

Filltheentirecanvas'bitmap(restrictedtothecurrentclip)withthespecifiedcolor,usingsrcoverporterduffmode.

Filltheentirecanvas'bitmap(restrictedtothecurrentclip)withthespecifiedcolorandblendmode.

Filltheentirecanvas'bitmap(restrictedtothecurrentclip)withthespecifiedcolorandporter-duffxfermode.

Drawsadoubleroundedrectangleusingthespecifiedpaint.

Drawarrayofglyphswithspecifiedfont.

Drawalinesegmentwiththespecifiedstartandstopx,ycoordinates,usingthespecifiedpaint.

Drawaseriesoflines.

Drawsameshobjecttothescreen.

Drawthespecifiedovalusingthespecifiedpaint.

Filltheentirecanvas'bitmap(restrictedtothecurrentclip)withthespecifiedpaint.

DrawsthespecifiedbitmapasanN-patch(mostoften,a9-patch.)

Drawthespecifiedpathusingthespecifiedpaint.

Savethecanvasstate,drawthepicture,andrestorethecanvasstate.

Drawthepicture,stretchedtofitintothedstrectangle.

HelperfordrawPoints()fordrawingasinglepoint.

HelperfordrawPoints()thatassumesyouwanttodrawtheentirearray

Drawaseriesofpoints.

Drawthetextinthearray,witheachcharacter'soriginspecifiedbytheposarray.

Filltheentirecanvas'bitmap(restrictedtothecurrentclip)withthespecifiedRGBcolor,usingsrcoverporterduffmode.

DrawthespecifiedRectusingthespecifiedPaint.

DrawthespecifiedRectusingthespecifiedpaint.

Drawsthegivenregionusingthegivenpaint.

DrawsthegivenRenderNode.

Drawthespecifiedround-rectusingthespecifiedpaint.

Drawthetext,withoriginat(x,y),usingthespecifiedpaint.

Drawthespecifiedrangeoftext,specifiedbystart/end,withitsoriginat(x,y),inthespecifiedPaint.

Drawthetext,withoriginat(x,y),usingthespecifiedpaint,alongthespecifiedpath.

Drawarunoftext,allinasingledirection,withoptionalcontextforcomplextextshaping.

Drawthearrayofvertices,interpretedastriangles(basedonmode).

EnablesZsupportwhichdefaultstodisabled.

Retrievetheboundsofthecurrentclip(inlocalcoordinates).

Returntheboundsofthecurrentclip(inlocalcoordinates)intheboundsparameter,andreturntrueifitisnon-empty.

Returnsthetargetdensityofthecanvas.

Returnstheheightofthecurrentdrawinglayer

Returnanewmatrixwithacopyofthecanvas'currenttransformationmatrix.

Return,inctm,thecurrenttransformationmatrix.

Returnsthemaximumallowedheightforbitmapsdrawnwiththiscanvas.

Returnsthemaximumallowedwidthforbitmapsdrawnwiththiscanvas.

Returnsthenumberofmatrix/clipstatesontheCanvas'privatestack.

Returnsthewidthofthecurrentdrawinglayer

IndicateswhetherthisCanvasuseshardwareacceleration.

Returntrueifthedevicethatthecurrentlayerdrawsintoisopaque(thatis,itdoesnotsupportper-pixelalpha).

Returntrueifthespecifiedpath,afterbeingtransformedbythecurrentmatrix,wouldliecompletelyoutsideofthecurrentclip.

Returntrueifthespecifiedrectangle,afterbeingtransformedbythecurrentmatrix,wouldliecompletelyoutsideofthecurrentclip.

Thiscallbalancesapreviouscalltosave(),andisusedtoremoveallmodificationstothematrix/clipstatesincethelastsavecall.

Efficientwaytopopanycallstosave()thathappenedafterthesavecountreachedsaveCount.

Preconcatthecurrentmatrixwiththespecifiedrotation.

Savesthecurrentmatrixandclipontoaprivatestack.

Thisbehavesthesameassave(),butinadditionitallocatesandredirectsdrawingtoanoffscreenrenderingtarget.

Thisbehavesthesameassave(),butinadditionitallocatesandredirectsdrawingtoanoffscreenbitmap.

HelperversionofsaveLayer()thattakes4valuesratherthanaRectF.

HelperforsaveLayerAlpha()thattakes4valuesinsteadofaRectF.

Preconcatthecurrentmatrixwiththespecifiedscale.

Specifyabitmapforthecanvastodrawinto.

SpecifiesthedensityforthisCanvas'backingbitmap.

Completelyreplacethecurrentmatrixwiththespecifiedmatrix.

Preconcatthecurrentmatrixwiththespecifiedskew.

Preconcatthecurrentmatrixwiththespecifiedtranslation

Note:forperformancereasons,itisstronglyrecommendedtopassthis-thecompletesetofflags-toanycalltosaveLayer()andsaveLayerAlpha()variants.

Note:allmethodsthatacceptthisflaghaveflaglessversionsthatareequivalenttopassingthisflag.

Theinitialtargetdensityofthecanvasisthesameasthegivenbitmap'sdensity.

Ifthestartangleisnegativeor>=360,thestartangleistreatedasstartanglemodulo360.

Ifthesweepangleis>=360,thentheovalisdrawncompletely.NotethatthisdiffersslightlyfromSkPath::arcTo,whichtreatsthesweepanglemodulo360.Ifthesweepangleisnegative,thesweepangleistreatedassweepanglemodulo360

Thearcisdrawnclockwise.Anangleof0degreescorrespondtothegeometricangleof0degrees(3o'clockonawatch.)

Note:ifthepaintcontainsamaskfilterthatgeneratesamaskwhichextendsbeyondthebitmap'soriginalwidth/height(e.g.BlurMaskFilter),thenthebitmapwillbedrawnasifitwereinaShaderwithCLAMPmode.Thusthecoloroutsideoftheoriginalwidth/heightwillbetheedgecolorreplicated.

Thisfunctionignoresthedensityassociatedwiththebitmap.Thisisbecausethesourceanddestinationrectanglecoordinatespacesareintheirrespectivedensities,somustalreadyhavetheappropriatescalingfactorapplied.

Ifthebitmapandcanvashavedifferentdensities,thisfunctionwilltakecareofautomaticallyscalingthebitmaptodrawatthesamedensityasthecanvas.

Treatthespecifiedarrayofcolorsasabitmap,anddrawit.Thisgivesthesameresultasfirstcreatingabitmapfromthearray,andthendrawingit,butthismethodavoidsexplicitlycreatingabitmapobjectwhichcanbemoreefficientifthecolorsarechangingoften.

SeeAlso

Notethatsincealineisalways"framed",theStyleisignoredinthepaint.

Degeneratelines(lengthis0)willnotbedrawn.

Therunoftextincludesthecharactersfromstarttoendinthetext.Inaddition,therangecontextStarttocontextEndisusedascontextforthepurposeofcomplextextshaping,suchasArabictextpotentiallyshapeddifferentlybasedonthetextnexttoit.

AlltextoutsidetherangecontextStart..contextEndisignored.Thetextbetweenstartandendwillbelaidoutanddrawn.Thecontextrangeisusefulforcontextualshaping,e.g.Kerning,Arabiccontexturalform.

ThedirectionoftherunisexplicitlyspecifiedbyisRtl.Thus,thismethodissuitableonlyforrunsofasingledirection.AlignmentofthetextisasdeterminedbythePaint'sTextAlignvalue.Further,0<=contextStart<=start<=end<=contextEnd<=text.lengthmustholdonentry.

Alsoseeandroid.graphics.Paint#getRunAdvanceforacorrespondingmethodtomeasurethetext;theadvancewidthofthetextdrawnmatchesthevalueobtainedfromthatmethod.

Anydrawreorderingwillnotbemovedbeforethiscall.Atypicalusageofthismightlooksomethinglike:

voiddraw(Canvascanvas){//Drawanybackgroundcontentcanvas.drawColor(backgroundColor);//BegindrawingthatmaybereorderedbasedoffofZcanvas.enableZ();for(RenderNodechild:children){canvas.drawRenderNode(child);}//EnddrawingthatmaybereorderedbasedoffofZcanvas.disableZ();//Drawanyoverlayscanvas.drawText("I'montopofeverything!",0,0,paint);}

Return,inctm,thecurrenttransformationmatrix.Thisdoesnotalterthematrixinthecanvas,butjustreturnsacopyofit.

Returntrueifthespecifiedpath,afterbeingtransformedbythecurrentmatrix,wouldliecompletelyoutsideofthecurrentclip.Callthistocheckifanareayouintendtodrawintoisclippedout(andthereforeyoucanskipmakingthedrawcalls).Note:forspeeditmayreturnfalseevenifthepathitselfmightnotintersecttheclip(i.e.theboundsofthepathintersects,butthepathdoesnot).

Returntrueifthespecifiedrectangle,afterbeingtransformedbythecurrentmatrix,wouldliecompletelyoutsideofthecurrentclip.Callthistocheckifanareayouintendtodrawintoisclippedout(andthereforeyoucanskipmakingthedrawcalls).

Subsequentcallstotranslate,scale,rotate,skew,concatorclipRect,clipPathwillalloperateasusual,butwhenthebalancingcalltorestore()ismade,thosecallswillbeforgotten,andthesettingsthatexistedbeforethesave()willbereinstated.

Alldrawingcallsaredirectedtoanewlyallocatedoffscreenrenderingtarget.Onlywhenthebalancingcalltorestore()ismade,isthatoffscreenbufferdrawnbacktothecurrenttargetoftheCanvas(whichcanpotentiallybeapreviouslayerifthesecallsarenested).

Alldrawingcallsaredirectedtoanewlyallocatedoffscreenbitmap.Onlywhenthebalancingcalltorestore()ismade,isthatoffscreenbufferdrawnbacktothecurrenttargetoftheCanvas(eitherthescreen,it'stargetBitmap,orthepreviouslayer).

THE END

Canvas

Canvas  AndroidDevelopers

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