Appearance Objects - Interactive Web-Based Virtual Reality with Java 3D - page 81

any graphics system, Java 3D included, point and line attributes are the two most funda-
mental attributes on which all visual objects are constructed.
In Java 3D, PointAttributes objects control how points in the virtual universe are ren-
dered. The PointAttributes class has several methods to increase the size of a single point.
However, note that a point will appear to be square in shape unless the setPointAntialias-
ingEnable() method is set to true.

Figure 9. Second segment of LineAttributesExample1.java and result

25.
26. public BranchGroup createSceneGraph() {
27.

BranchGroup objRoot = new BranchGroup();

28. //add more lines here

29. //test line width

30. objRoot.addChild(new aLine(-0.8f, 0.8f, 0.8f, 0.8f, 1f, LineAttributes.PATTERN_SOLID, false));

31. objRoot.addChild(new aLine(-0.8f, 0.7f, 0.8f, 0.7f, 3f, LineAttributes.PATTERN_SOLID, false));

32. objRoot.addChild(new aLine(-0.8f, 0.6f, 0.8f, 0.6f, 5f, LineAttributes.PATTERN_SOLID, false));

33.

34. //test line pattern

35. objRoot.addChild(new aLine(-0.8f, 0.4f, 0.8f, 0.4f, 3f, LineAttributes.PATTERN_DASH, false));

36. objRoot.addChild(new aLine(-0.8f, 0.3f, 0.8f, 0.3f, 3f, LineAttributes.PATTERN_DOT, false));

37. objRoot.addChild(new aLine(-0.8f, 0.2f, 0.8f, 0.2f, 3f, LineAttributes.PATTERN_DASH_DOT, false));

38.

39. //test antialiasing

40. objRoot.addChild(new aLine(-0.8f, -0.8f, -0.2f, -0.1f, 1f, LineAttributes.PATTERN_SOLID, false));

41. objRoot.addChild(new aLine(-0.7f, -0.8f, -0.1f, -0.1f, 1f, LineAttributes.PATTERN_SOLID, true));

42. objRoot.addChild(new aLine(-0.6f, -0.8f, 0.0f, -0.1f, 3f, LineAttributes.PATTERN_SOLID, false));

43. objRoot.addChild(new aLine(-0.5f, -0.8f, 0.1f, -0.1f, 3f, LineAttributes.PATTERN_SOLID, true));

44. objRoot.addChild(new aLine(-0.4f, -0.8f, 0.2f, -0.1f, 1f, LineAttributes.PATTERN_DASH, false));

45. objRoot.addChild(new aLine(-0.3f, -0.8f, 0.3f, -0.1f, 1f, LineAttributes.PATTERN_DASH, true));

46. objRoot.addChild(new aLine(-0.2f, -0.8f, 0.4f, -0.1f, 3f, LineAttributes.PATTERN_DASH, false));

47. objRoot.addChild(new aLine(-0.1f, -0.8f, 0.5f, -0.1f, 3f, LineAttributes.PATTERN_DASH, true));

48.
49. objRoot.compile();
50. return objRoot;

51. }