Select part of the texture in GUI.DrawTexture

Question

Hi guys, how are you? So, I need help to solution a problem in my game, how do I make to select just a part of the texture in GUI.DrawTexture and don't to show the rest? thanks a lot!

Answer 1

Best Answer

Answer by Molix · Aug 29, 2011 at 02:33 PM

You could use a GUI.BeginGroup to crop it, e.g.

 public Texture2D texture;
 public Rect textureCrop = new Rect( 0.1f, 0.1f, 0.5f, 0.25f );
 public Vector2 position = new Vector2( 10, 10 );
     
 void OnGUI()
 {
     GUI.BeginGroup( new Rect( position.x, position.y, texture.width * textureCrop.width, texture.height * textureCrop.height ) );
     GUI.DrawTexture( new Rect( -texture.width * textureCrop.x, -texture.height * textureCrop.y, texture.width, texture.height ), texture );
     GUI.EndGroup();
 }

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Ricardo_Stefani · Aug 29, 2011 at 11:20 PM 0

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Thanks guy!!!

Gurc · Apr 01, 2013 at 05:15 PM 0

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Excellent answer

Answer 2

Using GUI.DrawTextureWithTexCoords

Parameters

position: Represent position and "total" size of texture. texCoords: Use percentage per unit. Relative Left-Lower corner, and relative scale.

Axes Origin

OnGUI origin is Left-Upper corner: position parameter use this origin. But, in DrawTextureWithTexCoords the origin is Left-Lower corner: texCoords use this origin.

With texCoords parameter you can crop(percentage between 0-1) or tile image (width or height upper to 1).

To maintain aspect, also you must change "total" size of texture(position parameter).

Before this, you need save texture initial size(width,height).

 using UnityEngine;
 using System.Collections;
 
 
 [ExecuteInEditMode]
 public class NewBehaviourScript : MonoBehaviour {
     
     public Texture image;
     
     
     [Range(0f,1f)]
     public float x=0f;
     
     [Range(0f,1f)]
     public float y=0f;
     
     [Range(0f,1f)]
     public float width=1f;
     
     [Range(0f,1f)]
     public float height=1f;
     
     
     float initialWidth,initialHeight;
     bool imageEnabled=false;
     
     void Update(){
         
         if(!this.imageEnabled) if(this.image!=null){
             
             this.initialWidth = this.image.width;
             this.initialHeight = this.image.height;
             this.imageEnabled=true;
             
         }
         
     }
     
     void OnGUI(){
         
         if(imageEnabled){
             
             Rect position = new Rect(0f,0f,this.initialWidth*this.width,this.initialHeight*this.height);
             Rect coords = new Rect(this.x,this.y,this.width,this.height);
             GUI.DrawTextureWithTexCoords(position,this.image,coords);
             
         }
         
     }
     
 }

Select part of the texture in GUI.DrawTexture

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