The calculateProperties Function of the Visualization of a Triangle
This web page describes how to visualize a line with the help of the
3DVDM system. In this example we draw a triangle between three verteces:
(0, 0, 0), (1, 0, 0), and (0, 1, 0). We allow the user to change one
parameters of the visualization: to turn on/off the visualization.
Three blocks of code are used to visualize the tetrahedra: (i) the
allocation of the memory (cf. lines 14-21 of the code below), (ii) the
computation of the visualization parameters (cf. lines 22-38), and the
transfer of the data to the VR++ module of the system (cf. line 45).
The rest of the code is required to implement turning on/off of the
visualization. For example, lines 13-38 implements the scenario, when the
showObjects check box of the GUI is selected, and lines 39-44 implements
the scenario, when the showObjects check box is not selected.
1 TaskState ExampleMapper::calculateProperties()
2 {
3 // Triangle object
4 float vertex_1[3];
5 float vertex_2[3];
6 float vertex_3[3];
7 float color_1;
8 float color_2;
9 float color_3;
10 float transparency;
11 unsigned long object_triangle; // the counter of the triangles
12
13 if (showObjects == true){
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14 numberOfTriangles = 1;
15 if (triangleProperties == NULL){
16 triangleProperties = new float[TRIANGLE_PROPERTIES*numberOfTriangles];
17 } else {
18 delete [] lineProperties;
19 triangleProperties = new float[TRIANGLE_PROPERTIES*numberOfTriangles];
20 }
21
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22 // Coordinates of the triangle
23 vertex_1[0] = 0.0; vertex_1[1] = 0.0; vertex_1[2] = 0.0;
24 vertex_2[0] = 1.0; vertex_2[1] = 0.0; vertex_2[2] = 0.0;
25 vertex_3[0] = 0.0; vertex_3[1] = 1.0; vertex_3[2] = 0.0;
26
27 // Color of the triangle
28 color_1 = 0.7;
29 color_2 = 0.3;
30 color_3 = 0.1;
31 transparency = 1.0;
32
33 // Triangle counter
34 object_triangle = 0;
35
36 setTriangle(object_triangle, vertex_1, vertex_2, vertex_3,
37 color_1, color_2, color_3, transparency);
38
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39 } else {
40 numberOfTriangles = 0;
41 delete [] triangleProperties;
42 triangleProperties = NULL;
43
44 }
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