Unity3d学习笔记2——GUI实现简单计算器

目录

Unity3d学习笔记2GUI实现简单计算器 目录基础知识OnGUI函数Canvas画布简单计算器

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基础知识

GUI 这个东西重要性还是很重要的，所谓GUI就是图形用户界面。与用户直接进行交互的部分，自然重要，当然游戏整个运行中都是在与用户进行交互。Unity自带了一套GUI工具，虽然可能比较简陋，但是对于我这种初学者来说还是有很多帮助的。

OnGUI()函数

OnGUI: Called multiple times per frame in response to GUI events. The Layout and Repaint events are processed first, followed by a Layout and keyboard/mouse event for each input event. 这个函数其实就是用来渲染GUI以及相应处理GUI事件的函数。每一帧可能被调起很多次来处理这些事件。

Canvas画布

Canvas是一种带有canvas组件的GameObject。用来包含UI控件元素，所有UI元素都必须是这种Canvas的子对象。整个canvas画布在场景视图中是一个矩形。 包含在画布里面的UI元素会按照从上到下这样的先后顺序进行渲染，所以后渲染的元素是有可能覆盖掉前面先渲染的元素的，这就像刷油漆，你在一面墙上刷了第一个方块，再刷第二个的时候不小心刷到第一个，当然第一个就被你的第二个挡住了。

简单计算器

其实就是创建一些button，对应计算器的按钮，然后附上相应的行为，计算器的实现主要是双栈求值。 

下面是具体代码。

using UnityEngine; using System.Collections; public class GUIcreater : MonoBehaviour { public GUIStyle buttonstyle; string text=""; public class mycocluator{ float[] operation_number = new float[100]; int on_top = -1; char[] operation = new char[100]; int o_top = -1; public string computer(string s) { int i = 0; while (i < s.Length) { switch (s [i]) { case '+': operation [o_top + 1] = '+'; o_top++; break; case '-': operation [o_top + 1] = '-'; o_top++; break; case '*': operation [o_top + 1] = '*'; o_top++; break; case '/': operation [o_top + 1] = '/'; o_top++; break; } int j = 0; string temps = ""; while (((i+j) < s.Length) && (s [i + j] == '.' || (s [i + j] <= '9' && s [i + j] >= '0'))) { temps += s [i + j]; j++; } if (j != 0) { float temp = float.Parse (temps); on_top++; operation_number [on_top] = temp; i += j; } else { i++; } } int k = 0; while (o_top > -1) { Debug.Log (k); k++; float temp1, temp2; char tempc; Debug.Log ("o_top:" + o_top); if (o_top == -1) break; tempc = operation [o_top]; o_top--; Debug.Log ("o_top:" + o_top); temp1 = operation_number [on_top]; on_top--; temp2 = operation_number [on_top]; on_top--; switch (tempc) { case '+': operation_number [on_top + 1] = temp1 + temp2; on_top++; break; case '-': operation_number [on_top + 1] = temp2 - temp1; on_top++; break; case '*': operation_number [on_top + 1] = temp1 * temp2; on_top++; break; case '/': operation_number [on_top + 1] = temp2 / temp1; on_top++; break; } } Debug.Log (operation_number [on_top].ToString ()); return operation_number [on_top].ToString(); } } // Use this for initialization void Start () { } // Update is called once per frame void Update () { } void OnGUI(){ GUI.Box(new Rect (10, 10, 290, 50), text); for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) { if (GUI.Button (new Rect (10 + i * 60, 100 + j * 60, 50, 50), 1 + j * 3 + i + "", "button")) { text += 1 + j * 3 + i; } } } if (GUI.Button (new Rect (190, 100 , 50, 50), "C", "button")) { text =""; } if (GUI.Button (new Rect (250, 100 , 50, 50), "<-", "button")) { if (text.Length > 0) text = text.Remove(text.Length-1,1) ; } if (GUI.Button (new Rect (10, 280 , 110, 50), "0", "button")) { text +="0"; } if (GUI.Button (new Rect (130, 280 , 50, 50), ".", "button")) { text +="."; } if (GUI.Button (new Rect (190, 160 , 50, 50), "+", "button")) { text +="+"; } if (GUI.Button (new Rect (190, 220 , 50, 50), "-", "button")) { text +="-"; } if (GUI.Button (new Rect (250, 160 , 50, 50), "x", "button")) { text +="*"; } if (GUI.Button (new Rect (250, 220 , 50, 50), "/", "button")) { text +="/"; } if (GUI.Button (new Rect (190, 280 , 110, 50), "=", "button")) { mycocluator c = new mycocluator (); text = c.computer(text); } } }