[求助]：关于ads_vector_image

ppp1ppp2

各位仁兄:

   请问如何用ads_vector_image画一条弧线?
   不会是一度一度地画直线吧!?

XDSoft

最初由 ppp1ppp2 发布
[B]各位仁兄:

   请问如何用ads_vector_image画一条弧线?
   不会是一度一度地画直线吧!? [/B]

DCL画向量没有提供画弧，因此你需要先用算法用满足精度的折线模你ARC，然后画直线。

精度当然不要求一度一度的，看你的需要了，5度，10度都可以，或者你给”弦高差“做控制也可以。

ARX几何库有很多方法可以替你做

你先实例一个AcGeCircArc2d几何实体，然后设置好你的弧线参数。

然后使用：AcGeCurve2d::getSamplePoints 求样本点函数，有两个重载的方法，一个是给点数目，一个是给”弦高差“，直接就能得到样本点。

剩下就把这些点两两用向量画到DCL IMAGE里面就可以了。

2. 
   
3. [FONT=courier new]
   
4. AcGeCurve2d::getSamplePoints Function void
   
5. 
   
6. getSamplePoints(
   
7. 
   
8. double fromParam,
   
9. 
   
10. double toParam,
    
11. 
    
12. double approxEps,
    
13. 
    
14. AcGePoint2dArray& pointArray,
    
15. 
    
16. AcGeDoubleArray& paramArray) const;
    
17. 
    
18. fromParam Input starting parameter
    
19. toParam Input ending parameter
    
20. approxEps Input chord-height tolerance
    
21. pointArray Output array of points on curve between fromParam and toParam
    
22. paramArray Output array of parameters corresponding to points in pointArray
    
23. 
    
24. Returns a list of points on the curve between fromParam and toParam. The line segment between any two consecutive points returned in pointArray does not deviate by more than approxEps from the curve.
    
25. 
    
26. 
    
27. --------------------------------------------------------------------------------
    
28. 
    
29. void
    
30. 
    
31. getSamplePoints(
    
32. 
    
33. int numSample,
    
34. 
    
35. AcGePoint2dArray& unnamed) const;
    
36. 
    
37. numSample Input number of points that are to be returned
    
38. unnamed Output array of sampled points
    
39. 
    
40. Returns the specified number of points on the curve. The points are equally spaced by parameter value. So if the interval of the curve [0,1] and numSample is 5, the parameter values of the returned points will be 0, 0.25, 0.5, 0.75, and 1.
    
41. 
    
42. [/FONT]

<br /> [FONT=courier new]<br /> AcGeCurve2d::getSamplePoints Function void<br /> <br /> getSamplePoints(<br /> <br /> double fromParam,<br /> <br /> double toParam,<br /> <br /> double approxEps,<br /> <br /> AcGePoint2dArray& pointArray,<br /> <br /> AcGeDoubleArray& paramArray) const;<br /> <br /> fromParam Input starting parameter <br /> toParam Input ending parameter <br /> approxEps Input chord-height tolerance <br /> pointArray Output array of points on curve between fromParam and toParam <br /> paramArray Output array of parameters corresponding to points in pointArray <br /> <br /> Returns a list of points on the curve between fromParam and toParam. The line segment between any two consecutive points returned in pointArray does not deviate by more than approxEps from the curve. <br /> <br /> <br /> --------------------------------------------------------------------------------<br /> <br /> void<br /> <br /> getSamplePoints(<br /> <br /> int numSample,<br /> <br /> AcGePoint2dArray& unnamed) const;<br /> <br /> numSample Input number of points that are to be returned <br /> unnamed Output array of sampled points <br /> <br /> Returns the specified number of points on the curve. The points are equally spaced by parameter value. So if the interval of the curve [0,1] and numSample is 5, the parameter values of the returned points will be 0, 0.25, 0.5, 0.75, and 1.<br /> <br /> [/FONT]

ppp1ppp2

谢谢晓东!

ppp1ppp2

Mr. XDSOFT:
   如何在DCL的image中显示中文文字?
   是否用ads_vector_image函数?
   谢谢!

XDSoft

最初由 ppp1ppp2 发布
[B]Mr. XDSOFT:
   如何在DCL的image中显示中文文字?
   是否用ads_vector_image函数?
   谢谢! [/B]

根据SHX定义格式，把文字变成顶点表组成的线，再画到IMAGE里面。

ppp1ppp2

感谢XDSOFT!