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Encode Data Matrix 2d barcode in Font private void Create3DAxis() { // size of 3-D Axis

private void Create3DAxis() { // size of 3-D Axis
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CHAPTER 7 s 3-D GAME PROGRAMMING BASICS
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float axisLength = 1f; // Number of vertices we'll use int vertexCount = 6; VertexPositionColor[] vertices = new VertexPositionColor[vertexCount]; // X axis vertices[0] = new VertexPositionColor(new Vector3(-axisLength, 0.0f, 0.0f), Color.White); vertices[1] = new VertexPositionColor(new Vector3(axisLength, 0.0f, 0.0f), Color.White); // Y axis vertices[2] = new VertexPositionColor(new Vector3(0.0f, -axisLength, 0.0f), Color.White); vertices[3] = new VertexPositionColor(new Vector3(0.0f, axisLength, 0.0f), Color.White); // Z axis vertices[4] = new VertexPositionColor(new Vector3(0.0f, 0.0f, -axisLength), Color.White); vertices[5] = new VertexPositionColor(new Vector3(0.0f, 0.0f, axisLength), Color.White); // fill the vertex buffer with the vertices vertexBuffer = new VertexBuffer(device, vertexCount * VertexPositionColor.SizeInBytes, BufferUsage.WriteOnly); vertexBuffer.SetData<VertexPositionColor>(vertices); }
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As you can see, for this sample you used a vertex defined by its position and color, and defined all vertex colors as white. When drawing these vertices you ll use the line list primitive type, so every pair of vertices, in the order they were defined, will become a line. In the last part of the previous code, you created the vertex buffer, passing the graphics device, the size of the vertex buffer (calculated by the vertices count multiplied by the size of each vertex, given by VertexPositionColor.SizeInBytes), and the behavior of your buffer (you ll just write the vertices and use them later). After creating the buffer, in the last code line, you set the vertices data by calling the SetData method of the vertex buffer, which receives the vertices array you created and the vertices format (also called custom vertex format or flexible vertex format). To create the letters over the positive edge of each of the axes, you need to create new line segments that will form each letter. In such cases, the best you can do is to draw a little sketch so you can calculate the vertices position for every line, in every letter. Look
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at the distances presented in Figure 7-14 and compare them with the next code sample, which presents the complete Create3Daxis function. Make sure you understand how the X, Y, and Z letters are drawn.
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Figure 7-14. A sketch showing the dimensions to create each axis letter
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In case you re wondering how we came up with the values presented in Figure 7-14, the answer is easy: trial and error! If you don t like the way the characters look, just adjust the values until you find the desired effect.
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private void Create3DAxis() { // size of 3-D Axis float axisLength = 1f; // Number of vertices we'll use int vertexCount = 22; VertexPositionColor[] vertices = new VertexPositionColor[vertexCount]; // X axis vertices[0] = new VertexPositionColor( new Vector3(-axisLength, 0.0f, 0.0f), Color.White); vertices[1] = new VertexPositionColor( new Vector3(axisLength, 0.0f, 0.0f), Color.White); // Y axis vertices[2] = new VertexPositionColor( new Vector3(0.0f, -axisLength, 0.0f), Color.White); vertices[3] = new VertexPositionColor( new Vector3(0.0f, axisLength, 0.0f), Color.White); // Z axis vertices[4] = new VertexPositionColor( new Vector3(0.0f, 0.0f, -axisLength), Color.White); vertices[5] = new VertexPositionColor( new Vector3(0.0f, 0.0f, axisLength), Color.White); // "X" letter near X axis vertices[6] = new VertexPositionColor( new Vector3(axisLength vertices[7] = new VertexPositionColor( new Vector3(axisLength vertices[8] = new VertexPositionColor( new Vector3(axisLength vertices[9] = new VertexPositionColor( new Vector3(axisLength -
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0.1f, 0.05f, 0.0f), Color.White); 0.05f, 0.2f, 0.0f), Color.White); 0.05f, 0.05f, 0.0f), Color.White); 0.1f, 0.2f, 0.0f), Color.White);
// "Y" letter near Y axis vertices[10] = new VertexPositionColor( new Vector3(0.075f, axisLength - 0.125f, 0.0f), Color.White); vertices[11] = new VertexPositionColor(
CHAPTER 7 s 3-D GAME PROGRAMMING BASICS
vertices[12] vertices[13] vertices[14] vertices[15]
new Vector3(0.075f, axisLength - 0.2f, 0.0f), Color.White); = new VertexPositionColor( new Vector3(0.075f, axisLength - 0.125f, 0.0f), Color.White); = new VertexPositionColor( new Vector3(0.1f, axisLength - 0.05f, 0.0f), Color.White); = new VertexPositionColor( new Vector3(0.075f, axisLength - 0.125f, 0.0f), Color.White); = new VertexPositionColor( new Vector3(0.05f, axisLength - 0.05f, 0.0f), Color.White);
// "Z" letter near Z axis vertices[16] = new VertexPositionColor( new Vector3(0.0f, 0.05f, axisLength - 0.1f), Color.White); vertices[17] = new VertexPositionColor( new Vector3(0.0f, 0.05f, axisLength - 0.05f), Color.White); vertices[18] = new VertexPositionColor( new Vector3(0.0f, 0.05f, axisLength - 0.1f), Color.White); vertices[19] = new VertexPositionColor( new Vector3(0.0f, 0.2f, axisLength - 0.05f), Color.White); vertices[20] = new VertexPositionColor( new Vector3(0.0f, 0.2f, axisLength - 0.1f), Color.White); vertices[21] = new VertexPositionColor( new Vector3(0.0f, 0.2f, axisLength - 0.05f), Color.White); // fill the vertex buffer with the vertices vertexBuffer = new VertexBuffer(device, vertexCount * VertexPositionColor.SizeInBytes, ResourceUsage.WriteOnly, ResourceManagementMode.Automatic); vertexBuffer.SetData<VertexPositionColor>(vertices); }
You also need to create code in the LoadContent method to call the Create3Daxis, and in UnloadContent to free the vertex buffer property in the cls3Daxis class, as shown in the next code sample.
public void LoadContent() { // Create the 3-D axis Create3DAxis(); } public void UnloadContent() {
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