参考：

http://martinecker.com/martincodes/unity-editor-window-zooming/

http://answers.unity3d.com/questions/38224/how-can-i-zoom-out-properly-within-a-editorwindow.html

方法1：

using UnityEngine;
using System.Collections;public class Test : MonoBehaviour
{private Vector2 scale = new Vector2(1, 1);private Vector2 pivotPoint;void OnGUI(){Matrix4x4 oldMatrix = GUI.matrix;pivotPoint = new Vector2(Screen.width / 2, Screen.height / 2);GUIUtility.ScaleAroundPivot(scale, pivotPoint);if (GUI.Button(new Rect(Screen.width / 2 - 25, Screen.height / 2 - 25, 50, 50), "Big!"))scale += new Vector2(0.5F, 0.5F);GUI.matrix = oldMatrix;if (GUI.Button(new Rect(Screen.width / 2 + 25, Screen.height / 2 - 25, 50, 50), "Big!"))scale += new Vector2(0.5F, 0.5F);}
}

方法2：

using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;public class ZoomTestWindow : EditorWindow
{[MenuItem("Window/Zoom Test")]private static void Init(){ZoomTestWindow window = EditorWindow.GetWindow<ZoomTestWindow>(false, "Zoom Test");window.minSize = new Vector2(600.0f, 300.0f);window.wantsMouseMove = true;window.Show();//EditorWindow.FocusWindowIfItsOpen();}private const float kZoomMin = 0.1f;private const float kZoomMax = 10.0f;private readonly Rect _zoomArea = new Rect(0.0f, 75.0f, 600.0f, 300.0f - 100.0f);private float _zoom = 1.0f;private Vector2 _zoomCoordsOrigin = Vector2.zero;private Vector2 ConvertScreenCoordsToZoomCoords(Vector2 screenCoords){return (screenCoords - _zoomArea.TopLeft()) / _zoom + _zoomCoordsOrigin;}private void DrawZoomArea(){// Within the zoom area all coordinates are relative to the top left corner of the zoom area// with the width and height being scaled versions of the original/unzoomed area's width and height.EditorZoomArea.Begin(_zoom, _zoomArea);GUI.Box(new Rect(0.0f - _zoomCoordsOrigin.x, 0.0f - _zoomCoordsOrigin.y, 100.0f, 25.0f), "Zoomed Box");// You can also use GUILayout inside the zoomed area.GUILayout.BeginArea(new Rect(300.0f - _zoomCoordsOrigin.x, 70.0f - _zoomCoordsOrigin.y, 130.0f, 50.0f));GUILayout.Button("Zoomed Button 1");GUILayout.Button("Zoomed Button 2");GUILayout.EndArea();EditorZoomArea.End();}private void DrawNonZoomArea(){GUI.Box(new Rect(0.0f, 0.0f, 600.0f, 50.0f), "Adjust zoom of middle box with slider or mouse wheel.\nMove zoom area dragging with middle mouse button or Alt+left mouse button.");_zoom = EditorGUI.Slider(new Rect(0.0f, 50.0f, 600.0f, 25.0f), _zoom, kZoomMin, kZoomMax);GUI.Box(new Rect(0.0f, 300.0f - 25.0f, 600.0f, 25.0f), "Unzoomed Box");}private void HandleEvents(){// Allow adjusting the zoom with the mouse wheel as well. In this case, use the mouse coordinates// as the zoom center instead of the top left corner of the zoom area. This is achieved by// maintaining an origin that is used as offset when drawing any GUI elements in the zoom area.if (Event.current.type == EventType.ScrollWheel){Vector2 screenCoordsMousePos = Event.current.mousePosition;Vector2 delta = Event.current.delta;Vector2 zoomCoordsMousePos = ConvertScreenCoordsToZoomCoords(screenCoordsMousePos);float zoomDelta = -delta.y / 150.0f;float oldZoom = _zoom;_zoom += zoomDelta;_zoom = Mathf.Clamp(_zoom, kZoomMin, kZoomMax);_zoomCoordsOrigin += (zoomCoordsMousePos - _zoomCoordsOrigin) - (oldZoom / _zoom) * (zoomCoordsMousePos - _zoomCoordsOrigin);Event.current.Use();}// Allow moving the zoom area's origin by dragging with the middle mouse button or dragging// with the left mouse button with Alt pressed.if (Event.current.type == EventType.MouseDrag &&(Event.current.button == 0 && Event.current.modifiers == EventModifiers.Alt) ||Event.current.button == 2){Vector2 delta = Event.current.delta;delta /= _zoom;_zoomCoordsOrigin += delta;Event.current.Use();}}public void OnGUI(){HandleEvents();// The zoom area clipping is sometimes not fully confined to the passed in rectangle. At certain// zoom levels you will get a line of pixels rendered outside of the passed in area because of// floating point imprecision in the scaling. Therefore, it is recommended to draw the zoom// area first and then draw everything else so that there is no undesired overlap.DrawZoomArea();DrawNonZoomArea();}
}

using UnityEngine;
using System;// Helper Rect extension methods
public static class RectExtensions
{public static Vector2 TopLeft(this Rect rect){return new Vector2(rect.xMin, rect.yMin);}public static Rect ScaleSizeBy(this Rect rect, float scale){return rect.ScaleSizeBy(scale, rect.center);}public static Rect ScaleSizeBy(this Rect rect, float scale, Vector2 pivotPoint){Rect result = rect;result.x -= pivotPoint.x;result.y -= pivotPoint.y;result.xMin *= scale;result.xMax *= scale;result.yMin *= scale;result.yMax *= scale;result.x += pivotPoint.x;result.y += pivotPoint.y;return result;}public static Rect ScaleSizeBy(this Rect rect, Vector2 scale){return rect.ScaleSizeBy(scale, rect.center);}public static Rect ScaleSizeBy(this Rect rect, Vector2 scale, Vector2 pivotPoint){Rect result = rect;result.x -= pivotPoint.x;result.y -= pivotPoint.y;result.xMin *= scale.x;result.xMax *= scale.x;result.yMin *= scale.y;result.yMax *= scale.y;result.x += pivotPoint.x;result.y += pivotPoint.y;return result;}
}public class EditorZoomArea
{private const float kEditorWindowTabHeight = 21.0f;private static Matrix4x4 _prevGuiMatrix;public static Rect Begin(float zoomScale, Rect screenCoordsArea){GUI.EndGroup();        // End the group Unity begins automatically for an EditorWindow to clip out the window tab. This allows us to draw outside of the size of the EditorWindow.Rect clippedArea = screenCoordsArea.ScaleSizeBy(1.0f / zoomScale, screenCoordsArea.TopLeft());clippedArea.y += kEditorWindowTabHeight;GUI.BeginGroup(clippedArea);_prevGuiMatrix = GUI.matrix;Matrix4x4 translation = Matrix4x4.TRS(clippedArea.TopLeft(), Quaternion.identity, Vector3.one);Matrix4x4 scale = Matrix4x4.Scale(new Vector3(zoomScale, zoomScale, 1.0f));GUI.matrix = translation * scale * translation.inverse * GUI.matrix;return clippedArea;}public static void End(){GUI.matrix = _prevGuiMatrix;GUI.EndGroup();GUI.BeginGroup(new Rect(0.0f, kEditorWindowTabHeight, Screen.width, Screen.height));}
}

理解：

algorithm for scaling an image from a given pivot point：http://stackoverflow.com/questions/3598538/algorithm-for-scaling-an-image-from-a-given-pivot-point

Well, I don't know what framework/library you're using but you can think of it as:

translation to make your pivot point the center point
standard scaling
opposite transalation to make the center point the original pivot point

Translation and scaling are isomorphismes so you can represent them as matrix. Each transformation is a matrix and you can multiply them for find the combined transformation matrix. So:

T = transformation
S = scalling
T' = opposite transformation

If you apply T.x being x a point vector it gives you the new coordinates. The same for S.x.

So if you want to do that operations you have to do: T'. (S. (T.x))

I think you can associate operations so it's the same as (T'.S.T).x

If you are using a framework apply three operations (or combine operations and apply). If you are using crude math... go the matrix way :)

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Unity Editor Window Zooming

algorithm for scaling an image from a given pivot point：http://stackoverflow.com/questions/3598538/algorithm-for-scaling-an-image-from-a-given-pivot-point

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