這幾天用Unity3D做個射擊小游戲，想做個人形的血條。百思不得其解，后來問了網上的牛牛們，攻克了，事實上挺簡單的，GUI里面有個函數DrawTextureWithTexCoords就能夠實現圖片的裁剪。非常方便。裁剪之后。相信大家就都會操作了。話不多說。貼上代碼與截圖效果。

using?UnityEngine;

using?System.Collections;

using???UnityEditor;

?

public?class?drawTexture : MonoBehaviour {

????public?Texture back;//背景圖

????public?Texture fore;//前景圖

????private?float?scale_height = 0.99f;

????private?float?position_left=500f;

????private?float?position_top=300f;

????// Use this for initialization

????void?Start () {

?????

????}

?

????void?OnGUI()

????{

?

????????GUI.DrawTexture (new?Rect (position_left, position_top, back.width, back.height), back);

????????//GUI.DrawTexture (new Rect (500, 300, fore.width, fore.height), fore);

?

????????if?(Input.GetKeyUp(KeyCode.Space)) {

????????????scale_height=scale_height- 0.01f;

????????????if(scale_height<0)

????????????????scale_height=0;

????????????????}

????????GUI.Label (new?Rect(0,0,100,100),"scale_height"+scale_height);

????????GUI.DrawTextureWithTexCoords?(new?Rect (position_left, position_top+back.height*(1-scale_height), fore.width, fore.height*scale_height), fore,

???????????????????????????????????new?Rect(0,0,1, scale_height),true);

????}

????// Update is called once per frame

????void?Update () {

?????????

????}

}

效果圖：

效果還不錯吧。哈哈。

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