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using UnityEngine;
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using System.Collections;
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public class NewBehaviourScript : MonoBehaviour
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{
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public Vector2 mMouseStart, mMouseEnd;
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public bool mBDrawMouseRect;
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private Material rectMat = null;//画线的材质不设定系统会用当前材质画线 结果不可控
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void Start()
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{
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mBDrawMouseRect = false;
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rectMat = new Material("Shader \"Lines/Colored Blended\" {" +
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"SubShader { Pass { " +
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" Blend SrcAlpha OneMinusSrcAlpha " +
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" ZWrite Off Cull Off Fog { Mode Off } " +
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" BindChannels {" +
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" Bind \"vertex\", vertex Bind \"color\", color }" +
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"} } }");//生成画线的材质
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rectMat.hideFlags = HideFlags.HideAndDontSave;
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rectMat.shader.hideFlags = HideFlags.HideAndDontSave;
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} //Unity3D教程手册：www.unitymanual.com
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//void Update()
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//{
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// if (Input.GetMouseButtonDown(0))
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// //按下鼠标左键
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// {
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// Vector3 mousePosition = Input.mousePosition;
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// mMouseStart = new Vector2(mousePosition.x, mousePosition.y);
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// }
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// if (Input.GetMouseButton(0))
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// //持续按下鼠标左键
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// {
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// mBDrawMouseRect = true;
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// Vector3 mousePosition = Input.mousePosition;
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// mMouseEnd = new Vector2(mousePosition.x, mousePosition.y);
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// }
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// if (Input.GetMouseButtonUp(0))
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// {
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// mBDrawMouseRect = false;
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// }
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//}
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//Unity3D教程手册：www.unitymanual.com
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void OnGUI()
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{
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if (mBDrawMouseRect)
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Draw(mMouseStart, mMouseEnd);
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}
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//渲染2D框
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public void Draw(Vector2 start, Vector2 end)
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{
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rectMat.SetPass(0);
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GL.PushMatrix();//保存摄像机变换矩阵
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Color clr = Color.green;
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clr.a = 0.1f;
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GL.LoadPixelMatrix();//设置用屏幕坐标绘图
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//透明框
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GL.Begin(GL.QUADS);
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GL.Color(clr);
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GL.Vertex3(start.x, start.y, 0);
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GL.Vertex3(end.x, start.y, 0);
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GL.Vertex3(end.x, end.y, 0);
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GL.Vertex3(start.x, end.y, 0);
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GL.End();
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//线
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//上
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GL.Begin(GL.LINES);
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GL.Color(Color.green);
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GL.Vertex3(start.x, start.y, 0);
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GL.Vertex3(end.x, start.y, 0);
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GL.End();
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//下
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GL.Begin(GL.LINES);
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GL.Color(Color.green);
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GL.Vertex3(start.x, end.y, 0);
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GL.Vertex3(end.x, end.y, 0);
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GL.End();
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//左
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GL.Begin(GL.LINES);
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GL.Color(Color.green);
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GL.Vertex3(start.x, start.y, 0);
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GL.Vertex3(start.x, end.y, 0);
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GL.End();
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//右
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GL.Begin(GL.LINES);
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GL.Color(Color.green);
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GL.Vertex3(end.x, start.y, 0);
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GL.Vertex3(end.x, end.y, 0);
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GL.End();
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GL.PopMatrix();//还原
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}
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} |
