[vwnc] paint with double buffering in smalltalk
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[vwnc] paint with double buffering in smalltalk
 
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Hello, I paint a widget where the user can drag and drop. This widget is flickering alot. Do I have a chance to avoid this flickering. In Java I would use sth like double buffering. I would not paint in the widget directly. I would paint in a buffer ( e.g. copy of my widget) and after i finsihed painting i would use the buffer as my new widget. How can i do in smalltalk? My Code looks sth like this: \\ aViewList-method: aViewList "Draw-method of the Angle-List that display the angle graphical" | wb hy | ^aViewList ifNil: [aViewList := VisualBlock block: [:gc :bd | wb := (self widgetAt: #List) bounds extent. hy := (wb x half min: wb y half) - 20 max: 0. gc paint: ColorValue black. "draw shaft:" gc lineWidth: 10. gc displayPolyline: (Array with: wb x half @ wb y half with: (wb x half + (self angle asRAD cos * hy)) @ (wb y half - (self angle asRAD sin * hy))). ]] \\ postBuildWith: aBuilder-method: postBuildWith: aBuilder "List-widget:" (self widgetAt: #List) visualBlock: [:view :index | self aViewList]; selectedVisualBlock: [:view :index | self aViewList]; lineGrid: 1. ^super postBuildWith: aBuilder best regards, Peter Dziedzic -------------------------------------- Carl Zeiss Industrielle Meßtechnik GmbH/ Industrial Metrology Softwareentwicklung/Software Development P e t e r D z i e d z i c 73446 Oberkochen, Germany e-mail: [hidden email] http://www.zeiss.de/imt Carl Zeiss Industrielle Messtechnik GmbH Carl-Zeiss-Straße 22, 73447 Oberkochen Aufsichtsratsvorsitzender: Dr. Dieter Kurz Geschäftsführer: Dr. Rainer Ohnheiser, Felix Hoben, Hanspeter Mürle Sitz der Gesellschaft: 73446 Oberkochen, Deutschland Amtsgericht Ulm, HRB 501561, USt-IdNr.: DE 811 515 346 ---------------------------------------- This message is intended for a particular addressee only and may contain business or company secrets. If you have received this email in error, please contact the sender and delete the message immediately. Any use of this email, including saving, publishing, copying, replication or forwarding of the message or the contents is not permitted. _______________________________________________ vwnc mailing list [hidden email] http://lists.cs.uiuc.edu/mailman/listinfo/vwnc |
Re: [vwnc] paint with double buffering in smalltalk
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builder window damageRepairPolicy: DoubleBufferingWindowDisplayPolicy new. in a postOpenWith: method. (Or browse references to DoubleBufferingWindowDisplayPolicy for more examples) If your invalidates are well thought out, that should reduce flickering, Cheers, Henry On 23.10.2009 08:45, Dziedzic, Peter wrote:
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[vwnc] Antwort: Re: paint with double buffering in smalltalk
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Thanks for your answer. Your solution works very fine. Mit freundlichen Grüßen - best regards, Peter Dziedzic -------------------------------------- Carl Zeiss Industrielle Meßtechnik GmbH/ Industrial Metrology Softwareentwicklung/Software Development P e t e r D z i e d z i c 73446 Oberkochen, Germany tel: +49 73 64 20-84 48 fax: +49 73 64 20-48 00 e-mail: [hidden email] http://www.zeiss.de/imt Carl Zeiss Industrielle Messtechnik GmbH Carl-Zeiss-Straße 22, 73447 Oberkochen Aufsichtsratsvorsitzender: Dr. Dieter Kurz Geschäftsführer: Dr. Rainer Ohnheiser, Felix Hoben, Hanspeter Mürle Sitz der Gesellschaft: 73446 Oberkochen, Deutschland Amtsgericht Ulm, HRB 501561, USt-IdNr.: DE 811 515 346
Try putting something like: builder window damageRepairPolicy: DoubleBufferingWindowDisplayPolicy new. in a postOpenWith: method. (Or browse references to DoubleBufferingWindowDisplayPolicy for more examples) If your invalidates are well thought out, that should reduce flickering, Cheers, Henry On 23.10.2009 08:45, Dziedzic, Peter wrote: Hello, I paint a widget where the user can drag and drop. This widget is flickering alot. Do I have a chance to avoid this flickering. In Java I would use sth like double buffering. I would not paint in the widget directly. I would paint in a buffer ( e.g. copy of my widget) and after i finsihed painting i would use the buffer as my new widget. How can i do in smalltalk? My Code looks sth like this: \\ aViewList-method: aViewList "Draw-method of the Angle-List that display the angle graphical" | wb hy | ^aViewList ifNil: [aViewList := VisualBlock block: [:gc :bd | wb := (self widgetAt: #List) bounds extent. hy := (wb x half min: wb y half) - 20 max: 0. gc paint: ColorValue black. "draw shaft:" gc lineWidth: 10. gc displayPolyline: (Array with: wb x half @ wb y half with: (wb x half + (self angle asRAD cos * hy)) @ (wb y half - (self angle asRAD sin * hy))). ]] \\ postBuildWith: aBuilder-method: postBuildWith: aBuilder "List-widget:" (self widgetAt: #List) visualBlock: [:view :index | self aViewList]; selectedVisualBlock: [:view :index | self aViewList]; lineGrid: 1. ^super postBuildWith: aBuilder best regards, Peter Dziedzic -------------------------------------- Carl Zeiss Industrielle Meßtechnik GmbH/ Industrial Metrology Softwareentwicklung/Software Development P e t e r D z i e d z i c 73446 Oberkochen, Germany e-mail: p.dziedzic@... http://www.zeiss.de/imt Carl Zeiss Industrielle Messtechnik GmbH Carl-Zeiss-Straße 22, 73447 Oberkochen Aufsichtsratsvorsitzender: Dr. Dieter Kurz Geschäftsführer: Dr. Rainer Ohnheiser, Felix Hoben, Hanspeter Mürle Sitz der Gesellschaft: 73446 Oberkochen, Deutschland Amtsgericht Ulm, HRB 501561, USt-IdNr.: DE 811 515 346 ---------------------------------------- This message is intended for a particular addressee only and may contain business or company secrets. If you have received this email in error, please contact the sender and delete the message immediately. Any use of this email, including saving, publishing, copying, replication or forwarding of the message or the contents is not permitted. _______________________________________________ vwnc mailing list vwnc@... http://lists.cs.uiuc.edu/mailman/listinfo/vwnc _______________________________________________ vwnc mailing list [hidden email] http://lists.cs.uiuc.edu/mailman/listinfo/vwnc ---------------------------------------- This message is intended for a particular addressee only and may contain business or company secrets. If you have received this email in error, please contact the sender and delete the message immediately. Any use of this email, including saving, publishing, copying, replication or forwarding of the message or the contents is not permitted. _______________________________________________ vwnc mailing list [hidden email] http://lists.cs.uiuc.edu/mailman/listinfo/vwnc |
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