eprime语句.docx

eprime语句.docx

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eprime语句语句1DisplayDeviceObject（topic）DisplayDeviceisanabstractobjectderivedfromDevice.DisplayDeviceaddsfunctionalityrelatedtotheconfigurationofthedisplay,suchastherefreshrateandresolution.PropertiesCalculatedRefreshDurationIDSegmentCopyVerticalOffsetVerticalBlankSimulatedCountCalculatedRefreshRateNameTagVerticalBlankSimulationEnabledColorDepthRefreshDurationStatsVerticalBlankDetectedCountXResEchoClientsSegmentCopyMaxHeightVerticalBlankDurationStatsYResMethodsCalcActualRefreshRateCloseOpenSuspendCalculateRefreshRateCreateCanvasPaletteWaitForVerticalBlankCanvasGetStateResumeSeeAlsoCanvasObject（topic）DeviceObject（topic）PaletteObject（topic）2DisplayDevice.CreateCanvas（method）SyntaxSetCanvasName=Display.CreateCanvasDescriptionCreatesthecurrentcanvas,CanvasName,asanoffscreencanvasCommentsTheoffscreencanvaswillremainoffscreenuntilitissetasthecurrentdisplaycanvasPortionsoftheoffscreencanvascanbecopiedtothecurrentdisplaycanvasbyusingtheCanvas.CopymethodExampleThisexampleloadstheBlueCar.bitmapontotheoffscreencanvas,thencopiesittothedisplaycanvas.Declaretwocanvases,oneoff-screen,andoneastheactivedisplayDimcnvsAsCanvasDimoffScreenCnvsAsCanvasusetheCanvasmethodtocreateanactivedisplaycanvasSetcnvs=Display.CanvasusetheCreateCanvastocreateanoff-screencanvasSetoffScreenCnvs=Display.CreateCanvasDeclaretworectanglestodefinethesourceanddestinationareasDimsrcAsRectDimdestAsRectdefinesourcerectasfullscreensrc.Left=0src.Top=0src.Right=Display.XRessrc.Bottom=Display.YResdefinedestinationrectastopleftquadrantdest.Left=0dest.Top=0dest.Right=Display.XRes/2dest.Bottom=Display.YRes/2cnvs.TextColor=CColor（blue）cnvs.TextDisplay.XRes/2,Display.YRes/2,Loadingimage.Sleep（3000）LoadtheimagetooffscreencanvasoffScreenCnvs.FillColor=CColor（Blue）offScreenCnvs.ClearoffscreenCnvs.LoadImagebluecar.bmpCopyimagetodisplaycanvascnvs.TextDisplay.XRes/2,Display.YRes/2,Copyingvs.CopyoffScreenCnvs,src,destSleep3000Note:

TorunthisexamplewithE-BasicExample.es,copythescriptaboveandpasteitintotheSetupInLineobject.Also,besuretocopytheBlueCarbitmapfromPictureRTfoldertotheMyExperiments/TutorialsfolderwhereE-BasicExample.esislocated.SeeAlsoDisplayDeviceObject（topic）3DisplayDevice.Canvas（method）SyntaxSetCanvasName=Display.CanvasDescriptionSetsareferencetocreatethecanvas,CanvasName,asthecurrent,onscreencanvasCommentsAllchangesmadetoCanvasNamewillbeimmediatelyvisiblewhenCanvasNameisthecurrent,onscreencanvasExampleThisexampledrawsasingleredlineontheonscreencanvas.CreateaCanvasDimcnvsAsCanvasMakecnvsthecurrent,onscreencanvasSetcnvs=Display.CanvasSetthewidthandcolorofthepencnvs.PenWidth=5cnvs.PenColor=CColor（255,0,0）DrawaLineinredcnvs.Line100,100,200,100Sleep1000Note:

TorunthisexamplewithE-BasicExample.es,copythescriptaboveandpasteitintotheBeforeInLineobject.SeeAlsoCanvasObject（topic）DisplayDeviceObject（topic）4CanvasObject（topic）TheCanvasObjectabstractstheprogramminginterfacetoaparticularcanvas.PropertiesBackStyleFontNameIDROPModeTextColorFillColorFontSizeNameSourceColorKeyFontBoldFontStrikeoutPenColorTagFontItalicFontUnderlinePenWidthTextBackColorMethodsArcClearLineToPieSaveImageCalculateTextSizeCopyLoadImagePolygonSetPixelChordGetPixelMoveToRectangleTextCircleLineOvalRoundedRectangleSeeAlsoDisplayDeviceObject（topic）5RteObject（topic）TheRteObjectisanabstractobjectandistherootofallotherobjects.PropertiesNameIDTagSeeAlsoClockObject（topic）InputMaskObject（topic）DebugObject（topic）OrderObject（topic）PRNGObject（topic）PaletteObject（topic）Rte（topic）ResponseDataObject（topic）CanvasObject（topic）RteAuditObject（topic）CellSpecObject（topic）RteCollectionObject（topic）ContextObject（topic）SlideStateObject（topic）DataFileObjectSlideStimObject（topic）DeletionObject（topic）SoundBufferObject（topic）DeviceObject（topic）SummationObject（topic）DeviceManagerObject（topic）TriggerObject（topic）EchoClientObject（topic）6ClockObject（topic）TheClockObjectabstractsthecurrentreal-timeclockthatisinuse.TheClockObjectisrun-timeonly.PropertiesIDNameScaleTagMethodsReadRead100thMillisecMicrosecResetScaleRead10thMillisecRead1000thMillisecReadMillisecSeeAlsoRteObject（topic）DisplayDevice.WaitForVerticalBlank（method）Syntax7DisplayDevice.WaitForVerticalBlankDescriptionWaitsforthestartofthenextrefreshcyclebeforemovingtonextstatementComments?

ThispropertyreturnsorsetsaBooleanvalue?

Waitingfortheverticalblankisessentialtoensurecontentsdrawntothescreenoccurwithinonescreenrefresh.?

ConsiderpreparingitemsinanoffscreenCanvasandtheusingCanvas.CopyafteracalltoDisplayDevice.WaitForVerticalBlanktoensurecontentsdrawntothescreenoccurwithinonescreenrefresh.?

WhenDisplayDevice.VerticalBlankSimulationEnable=Truethesystemwillusebothhardwareandsoftwareoperationstowaitfortheverticalblankevent.Thesystemcollectsstatisticsonthetimingofthehardwareverticalblankeventsandthenusesmathematicalcalculationstopredictthestarttimeofthenextrefreshcycle.Ifahardwareverticalblankeventisnotobservedwithinthepredictedtime,thecallwillsimulatetheverticalblankeventinsoftwareandcontinue.?

WhencallingDisplayDevice.WaitForVerticalBlankinsuccession,aSleepcommandshouldbecalledbetweensuccessivecallssincetheverticalblankcouldbeoccurringandwouldimmediatelyreturn.ASleepdurationof?

oftherefreshdurationshouldbeused.ExampleThisexampleloadsanimagetothecurrentcanvas,copiesthatimagetoanoff-screencanvas,thenusesthatimagetopresentanimation.CreateaCanvasDimcnvsAsCanvasSetcnvs=Display.CanvasDimx,y,i,carlengthAsIntegerx=10y=150carlength=250Createoff-screencanvasDimoffScreenCnvsAsCanvasSetoffScreenCnvs=Display.CreateCanvasoffScreenCnvs.ClearoffScreenCnvs.SourceColorKey=CColor（black）DefinethesourceanddestinationrectanglesDimcarRectAsRectcarRect.Left=0carRect.Right=carlengthcarRect.Top=0carRect.Bottom=150Loadtheimagetotheactivedisplay,thencopyoff-screenImageDisplay1.DrawSleep2000offScreenCnvs.Copycnvs,carRect,carRectDefinedestinationrectangleDimdestRectAsRectdestRect.Left=xdestRect.Right=x+carlengthdestRect.Top=ydestRect.Bottom=y+150cnvs.FillColor=CColor（blue）Fori=1toDisplay.XRes-carlengthcnvs.clearDisplay.WaitForVerticalBlankcnvs.CopyoffScreenCnvs,carRect,destRect,_ebEffectSourceColorKeyx=x+1destRect.Left=xdestRect.Right=x+carlengthSleep20NextiTorunthisexamplewithE-BasicExample.es,copythescriptaboveandpasteitintotheAfterInLineobject.CreatetheImageDisplay1objectintheUnreferencedE-Objectsfolder.InthePropertiesWindowforImageDisplay1,setFilenametoredcar.bmp,andBackColortoblue.Inaddition,settheAlignHorizontaltoleftandAlignVerticaltotop.SeeAlsoCanvasObject（topic）DisplayDeviceObject（topic）8Canvas.Clear（method）SyntaxCanvas.ClearDescriptionClearstheCanvas.CommentsTheCanvaswillbeclearedusingthecurrentFillColorsetting.ExampleThisexampleclearsthecanvastoblue.CreateaCanvasDimcnvsAsCanvasSetcnvs=Display.Canvascnvs.FillColor=CColor（Blue）cnvs.ClearSleep（1000）Note:

TorunthisexamplewithE-BasicExample.es,copythescriptaboveandpasteitintotheAfterInLineobject.9Canvas.SourceColorKey（property）SyntaxCanvas.SourceColorKeyDescriptionSetsthesourcecolorkeyfortransparencyduringcopyoperations.CommentsThesourcecolorkeyallowsthesourcetodesignateareasofitselftobetransparentduringcopyoperations.Anyareasappearinginthesourcecolorkeywillbetransparentwhencopiedtoadifferentsurface.ExampleThisexampleloadsanimagetothecurrentcanvas,copiesthatimagetoanoff-screencanvas,thenusesthatimagetopresentanimation.CreateaCanvasDimcnvsAsCanvasSetcnvs=Display.CanvasDimx,y,i,carlengthAsIntegerx=10y=150carlength=250Createoff-screencanvasDimoffScreenCnvsAsCanvasSetoffScreenCnvs=Display.CreateCanvasoffScreenCnvs.ClearoffScreenCnvs.SourceColorKey=CColor（black）DefinethesourceanddestinationrectanglesDimcarRectAsRectcarRect.Left=0carRect.Right=carlengthcarRect.Top=0carRect.Bottom=150Loadtheimagetotheactivedisplay,thencopyoff-screenImageDisplay1.DrawSleep2000offScreenCnvs.Copycnvs,carRect,carRectDefinedestinationrectangleDimdestRectAsRectdestRect.Left=xdestRect.Right=x+carlengthdestRect.Top=ydestRect.Bottom=y+150cnvs.FillColor=CColor（blue）Fori=1toDisplay.XRes-carlengthcnvs.clearDisplay.WaitForVerticalBlankcnvs.CopyoffScreenCnvs,carRect,destRect,ebEffectSourceColorKeyx=x+1destRect.Left=xdestRect.Right=x+carlengthSleep20NextiTorunthisexamplewithE-BasicExample.es,copythescriptaboveandpasteitintotheAfterInLineobject.CreatetheImageDisplay1objectintheUnreferencedE-Objectsfolder.InthePropertiesWindowforImageDisplay1,setFilenametoredcar.bmp,andBackColortoblue.RedCar.bmpislocatedintheSamplesPictureRTfolderaspartoftheE-Primeinstall.Inaddition,settheAlignHorizontaltoleftandAlignVerticaltotop.SeeAlsoCanvasObject（topic）10PointInRect（method）SyntaxbIsInRect=PointInRect（point,rect）DescriptionDeterminesifthepointcoordinateisapartofanyofthecoordinatesforagivenrectangle.Comments?

The1stparameter,point,isarequiredPointstructurethatrepresentsthecoordinatetotest.?

The2ndparameter,rect,isarequiredRectstructurethatrepresentstherectangletotestagainst.?

Thevaluereturned,bIsInRect,isaBooleanvaluerepresentingifthecoordinateispartofanyoftherectanglescoordinates.ExampleThefollowingexampleshowshowP