using UnityEngine;public class PieChartMesh : MonoBehaviour{float[] mData;int mSlices;float mRotationAngle;float mRadius;Vector3[] mVertices;Vector3[] mNormals;Vector3 mNormal = new Vector3(0f, 0f, -1f);Vector2[] mUvs;int[] mTriangles;MeshRenderer mMeshRenderer;public void Init(float[] data, int slices, float rotatioAngle, float radius){mData = data;mSlices = slices;mRotationAngle = rotatioAngle;mRadius = radius;// Get Mesh RenderermMeshRenderer = gameObject.GetComponent("MeshRenderer") as MeshRenderer;if (mMeshRenderer == null){gameObject.AddComponent("MeshRenderer");mMeshRenderer = gameObject.GetComponent("MeshRenderer") as MeshRenderer;}}public void Draw(float[] data){mData = data;Draw();}public void Draw(){//Check data validity for pie chart…if (mData == null){print("PieChart: Data null");return;}// Calculate sum of data valuesfloat sumOfData = 0;foreach (float value in mData){sumOfData += value;}// Determine how many triangles in sliceint[] slice = new int[mData.Length];int numOfTris = 0;int numOfSlices = 0;int countedSlices = 0;// Caluclate slice sizefor (int i = 0; i < mData.Length; i++){numOfTris = (int)((mData[i] / sumOfData) * mSlices);slice[numOfSlices++] = numOfTris;countedSlices += numOfTris;}// Check that all slices are counted.. if not -> add/sub to/from biggest slice..int idxOfLargestSlice = 0;int largestSliceCount = 0;for (int i = 0; i < mData.Length; i++){if (largestSliceCount < slice[i]){idxOfLargestSlice = i;largestSliceCount = slice[i];}}// Adjust largest dataset to get proper sliceslice[idxOfLargestSlice] += mSlices – countedSlices;// Init vertices and triangles arraysmVertices = new Vector3[mSlices * 3];mNormals = new Vector3[mSlices * 3];mUvs = new Vector2[mSlices * 3];mTriangles = new int[mSlices * 3];Mesh mesh = ((MeshFilter)GetComponent("MeshFilter")).mesh;mesh.Clear();mesh.name = "Pie Chart Mesh";// Roration offset (to get star point to "12 o’clock")float rotOffset = mRotationAngle / 360f * 2f * Mathf.PI;// Calc the points in circlefloat angle;float[] x = new float[mSlices];float[] y = new float[mSlices];for (int i = 0; i < mSlices; i++){angle = i * 2f * Mathf.PI / mSlices;x[i] = (Mathf.Cos(angle + rotOffset) * mRadius);y[i] = (Mathf.Sin(angle + rotOffset) * mRadius);}// Generate mesh with slices (vertices and triangles)for (int i = 0; i < mSlices; i++){mVertices[i * 3 + 0] = new Vector3(0f, 0f, 0f);mVertices[i * 3 + 1] = new Vector3(x[i], y[i], 0f);// This will ensure that last vertex = first vertex..mVertices[i * 3 + 2] = new Vector3(x[(i + 1) % mSlices], y[(i + 1) % mSlices], 0f);mNormals[i * 3 + 0] = mNormal;mNormals[i * 3 + 1] = mNormal;mNormals[i * 3 + 2] = mNormal;mUvs[i * 3 + 0] = new Vector2(0f, 0f);mUvs[i * 3 + 1] = new Vector2(x[i], y[i]);// This will ensure that last uv = first uv..mUvs[i * 3 + 2] = new Vector2(x[(i + 1) % mSlices], y[(i + 1) % mSlices]);mTriangles[i * 3 + 0] = i * 3 + 0;mTriangles[i * 3 + 1] = i * 3 + 1;mTriangles[i * 3 + 2] = i * 3 + 2;}// Assign verts, norms, uvs and tris to mesh and calc normalsmesh.vertices = mVertices;mesh.normals = mNormals;mesh.uv = mUvs;//mesh.triangles = triangles;mesh.subMeshCount = mData.Length;int[][] subTris = new int[mData.Length][];countedSlices = 0;// Set sub meshesfor (int i = 0; i < mData.Length; i++){// Every triangle has three veritces..subTris[i] = new int[slice[i] * 3];// Add tris to subTrisfor (int j = 0; j < slice[i]; j++){subTris[i][j * 3 + 0] = mTriangles[countedSlices * 3 + 0];subTris[i][j * 3 + 1] = mTriangles[countedSlices * 3 + 1];subTris[i][j * 3 + 2] = mTriangles[countedSlices * 3 + 2];countedSlices++;}mesh.SetTriangles(subTris[i], i);}}}
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