几何尺寸与公差论坛------致力于产品几何量公差标准GD&T (GDT:ASME)|New GPS(ISO)研究/CAD设计/CAM加工/CMM测量  


返回   几何尺寸与公差论坛------致力于产品几何量公差标准GD&T (GDT:ASME)|New GPS(ISO)研究/CAD设计/CAM加工/CMM测量 » 仿射空间:CAX软件开发(三)二次开发与程序设计 » CAD二次开发 » AutoCAD二次开发 » DirectDWG
用户名
密码
注册 帮助 会员 日历 银行 搜索 今日新帖 标记论坛为已读


回复
 
主题工具 搜索本主题 显示模式
旧 2009-05-06, 10:11 PM   #1
yang686526
高级会员
 
注册日期: 06-11
帖子: 14579
精华: 1
现金: 224494 标准币
资产: 234494 标准币
yang686526 向着好的方向发展
默认 【转帖】polygon vs. simplepolygon

polygon vs. simplepolygon
polygon vs. simplepolygon
hi,
there are a few polygon methods defined in odgsbaseview, namely:
polygon
simplepolygon
linetypedpolygondc
polygondc
polygoneye
can anybody explain what is the purpose of each of the methods and what is their mutual relation? i guess polygondc is the final methods that receives already transformed points in the current dc space. i also guess polygon is the first method, which - if not hanled - calls the other methods. but what about the others?
the some for polylines.
thanks
arno歵
hi,
in v1.09 we strongly recommend to override polylinedc() and polygondc() only! and get finalized geometry in screen coordinates. in v1.10 rendering pipeline is redezigned to be more flexible and allows user to get finalized output (linetype, model clipping are applied) in different coordinates (worldcs, eyecs, screencs and eyecs + usercs) as a set of final lines, curves, meshes and texts.
here how it is in v1.09:
polygon receives calls from odgidrawable in model coordinates; to rasterize it -- model to device transform, model clipping (pushed by pushclippboundary()), linetype or filling should be applied.
polygoneye receives calls from odgidrawable in eye coordinates; to rasterize it -- eye to device transform, model clipping, filling should be applied.
simplepolygon called by dwg framework while process (either polygon(), shell(), mesh()); to rasterize it -- model to device transform, model clipping and filling should be applied.
linetypedpolygondc called by dwg framework while process (either polygon(), shell(), mesh()); to rasterize it -- linetype should be applied.
polygondc called by dwg framework while process (either polygon(), shell(), mesh()); it is finalized in screen coordinates.

thanks a lot dmitry, that was very descriptive and helpful.
because i need to handle entities on higher level then just polygons and polylines, i have yet to decide whether to write all the necessary operations (transforms, fills, linetypes, blocks, etc.) or wait for the 1.10 version. as i understand it, if i want to handle higher entities as well, i have to stay on the entry polygon/polyline level, because i do not get complex entities beyond that anymore. i have already covered most of the entities but i would be, naturally, more comfortable if dd would handle it instead. the words is that 1.10 is being released this month. is it still true?
thanks
arno歵
yang686526离线中   回复时引用此帖
GDT自动化论坛(仅游客可见)
回复


主题工具 搜索本主题
搜索本主题:

高级搜索
显示模式

发帖规则
不可以发表新主题
不可以回复主题
不可以上传附件
不可以编辑您的帖子

vB 代码开启
[IMG]代码开启
HTML代码关闭



所有的时间均为北京时间。 现在的时间是 12:51 AM.


于2004年创办,几何尺寸与公差论坛"致力于产品几何量公差标准GD&T | GPS研究/CAD设计/CAM加工/CMM测量"。免责声明:论坛严禁发布色情反动言论及有关违反国家法律法规内容!情节严重者提供其IP,并配合相关部门进行严厉查处,若內容有涉及侵权,请立即联系我们QQ:44671734。注:此论坛须管理员验证方可发帖。
沪ICP备06057009号-2
更多