最近研究了曲线绘制的工具，主要是2D方程的绘制。综合了许多工具，完成了一下两个脚本。
绘制的工具：
using UnityEngine;
using System.Collections;
using UnityEngine.UI; public class Curve : MaskableGraphic
{
public Color color;
public float m_LineWidth = ;
[Range(, )]
public int Acc = ;
public System.Func<float, float> xConvert = x=>x;
public System.Func<float, float> yConvert = y => y;
public System.Func<float, float> MainFunc = f => f;
protected override void OnPopulateMesh(VertexHelper vh)
{
var rect = this.rectTransform.rect;
vh.Clear();
Debug.Log(rect.xMin);
Debug.Log(rect.xMax);
Vector2 pos_first = new Vector2(rect.xMin, CalcY() * rect.height+rect.yMin); for (float x = rect.xMin + Acc; x < rect.xMax; x += Acc)
{
Vector2 pos = new Vector2(x, CalcY((x - rect.xMin) / rect.width) * rect.height+rect.yMin);
var quad = GenerateQuad(pos_first, pos); vh.AddUIVertexQuad(quad); pos_first = pos;
} Vector2 pos_last = new Vector2(rect.xMax, CalcY() * rect.height+rect.yMin);
vh.AddUIVertexQuad(GenerateQuad(pos_first, pos_last)); for (int i = ; i < vh.currentVertCount - ; i += )
{
vh.AddTriangle(i + , i + , i + );
vh.AddTriangle(i + , i + , i + );
}
Debug.Log("PopulateMesh..." + vh.currentVertCount);
} //根据曲线组件来计算Y
//**** x 为 (x - rect.xMin) / rect.width) 所以范围 为 0~1
//返回值 为y ，取值范围限定在 0~1；
private float CalcY(float x)
{
return yConvert((MainFunc(xConvert(x))));
} private UIVertex[] GenerateQuad(Vector2 pos1, Vector2 pos2)
{
float dis = Vector2.Distance(pos1, pos2);
float y = m_LineWidth * 0.5f * (pos2.x - pos1.x) / dis;
float x = m_LineWidth * 0.5f * (pos2.y - pos1.y) / dis; if (y <= )
y = -y;
else
x = -x; UIVertex[] vertex = new UIVertex[]; vertex[].position = new Vector3(pos1.x + x, pos1.y + y);
vertex[].position = new Vector3(pos2.x + x, pos2.y + y);
vertex[].position = new Vector3(pos2.x - x, pos2.y - y);
vertex[].position = new Vector3(pos1.x - x, pos1.y - y); for (int i = ; i < vertex.Length; i++)
{
vertex[i].color = color;
} return vertex;
}
}
控制脚本：
using UnityEngine;
using System.Collections;
using System;
[RequireComponent(typeof(Curve))]
public class CurveItem : MonoBehaviour {
private Curve curve;
private Vector2[] posArray; //绘制谱图x 最小值
[Header("绘制谱图x 最小值")]
public float xMin;
//绘制谱图 x 最大值
[Header("绘制谱图x 最大值")]
public float xMax;
//绘制 谱图 y 最小值
[Header("绘制谱图y 最小值")]
public float yMin;
//绘制谱图 y 最大值
[Header("绘制谱图y 最大值")]
public float yMax;
[Header("绘制谱图取样间隔")]
public float delta;
// Use this for initialization
void Start () {
curve = this.GetComponentInChildren<Curve>();
} #region 主要方法 public void ShowPutu(Func<float, float> func)
{
// DrawLine(LineDrawer.GetSampleArray(func, xMin, xMax, delta));
curve.MainFunc = func;
curve.xConvert = MathTool.GetLinear(, xMin, , xMax);
curve.yConvert = MathTool.GetLinear(yMin, , yMax, 1f);
curve.enabled = false;
curve.enabled = true;
} #endregion #region Test private Func<float, float> func = x=>x*x; [ContextMenu("谱图")]
private void Test()
{
ShowPutu(func);
} #endregion
}
Math工具
//获取线性方程
public static Func<float, float> GetLinear(float x0, float y0, float x1, float y1)
{
Func<float, float> linear = x =>
{
float a = (y1 - y0) / (x1 - x0);
return x*a+y0-x0*a;
};
return linear;
}
调用以下方法即可。
ShowPutu(Func<float, float> func)
将两个脚本都挂载在Canvas下的一个空物体上。
演示 x=>x*x：
演示 x=>Mathf.Asin(x)：