Camera pan and zoom

Hi, can someone help me with a script for move+zoom top view ortho camera with mouse click like google maps?

Thanks.

 

What do you have so far? What aspects are you struggling with?

 

I found in this post the script below

Code (CSharp):

1. using UnityEngine;
2.     using System.Collections;
3.  
4.     public class MapControl : MonoBehaviour {
5.         public float maxZoom;
6.         public float minZoom;
7.         public float panSpeed = -1;
8.    
9.         Vector3 bottomLeft;
10.         Vector3 topRight;
11.    
12.         float cameraMaxY;
13.         float cameraMinY;
14.         float cameraMaxX;
15.         float cameraMinX;
16.    
17.         void Start()
18.         {
19.             //set max camera bounds (assumes camera is max zoom and centered on Start)
20.             topRight = camera.ScreenToWorldPoint(new Vector3(camera.pixelWidth, camera.pixelHeight, -transform.position.z));
21.             bottomLeft = camera.ScreenToWorldPoint(new Vector3(0,0,-transform.position.z));
22.             cameraMaxX = topRight.x;
23.             cameraMaxY = topRight.y;
24.             cameraMinX = bottomLeft.x;
25.             cameraMinY = bottomLeft.y;
26.         }
27.    
28.         void Update ()
29.         {
30.             //click and drag
31.             if(Input.GetMouseButton(0))
32.             {
33.                 float x = Input.GetAxis("Mouse X") * panSpeed;
34.                 float y = Input.GetAxis("Mouse Y") * panSpeed;
35.                 transform.Translate(x,y,0);
36.             }
37.        
38.             //zoom
39.             if((Input.GetAxis("Mouse ScrollWheel") > 0)  Camera.main.orthographicSize > minZoom ) // forward
40.             {
41.                 Camera.main.orthographicSize = Camera.main.orthographicSize - 0.5f;
42.             }
43.            
44.             if ((Input.GetAxis("Mouse ScrollWheel") < 0)  Camera.main.orthographicSize < maxZoom) // back        
45.             {
46.                 Camera.main.orthographicSize = Camera.main.orthographicSize + 0.5f;
47.             }
48.        
49.        
50.             //check if camera is out-of-bounds, if so, move back in-bounds
51.             topRight = camera.ScreenToWorldPoint(new Vector3(camera.pixelWidth, camera.pixelHeight, -transform.position.z));
52.             bottomLeft = camera.ScreenToWorldPoint(new Vector3(0,0,-transform.position.z));
53.        
54.             if(topRight.x > cameraMaxX)
55.             {
56.                 transform.position = new Vector3(transform.position.x - (topRight.x - cameraMaxX), transform.position.y, transform.position.z);
57.             }
58.        
59.             if(topRight.y > cameraMaxY)
60.             {
61.                 transform.position = new Vector3(transform.position.x, transform.position.y - (topRight.y - cameraMaxY), transform.position.z);
62.             }
63.        
64.             if(bottomLeft.x < cameraMinX)
65.             {
66.                 transform.position = new Vector3(transform.position.x + (cameraMinX - bottomLeft.x), transform.position.y, transform.position.z);
67.             }
68.        
69.             if(bottomLeft.y < cameraMinY)
70.             {
71.                 transform.position = new Vector3(transform.position.x, transform.position.y + (cameraMinY - bottomLeft.y), transform.position.z);
72.             }
73.         }
74.     }[/SIZE]
75.  
76.  

but gives the error:

Assets/Standard Assets/Character Controllers/MapControl.cs(39,67): error CS1525: Unexpected symbol `Camera'

I have a simple terrain with a camera with their X axis at 90 so the view is similar to a map and I wanted to pan and zoom the camera to resemble google maps like camera.

I found StrategyCam in the asset store too that emulates what I'm trying to achieve, but is not free.

Regards.

 

I believe all common properties were removed in Unity5. At the beginning of your Start function, put this:

Code (CSharp):

1. var camera = GetComponent<Camera>();

 

Thanks, I'll try it as soon as I can, I'm using Unity 4.6.1f1

Regards

 

Actually, the problem is probably there is no camera in your scene tagged as "Main Camera". Make sure of that before doing anything else

 

I have a Main Camera on my project, actually If I comment the zoom code

Code (CSharp):

1.         /*//zoom
2.         if((Input.GetAxis("Mouse ScrollWheel") > 0) Camera.main.orthographicSize > minZoom ) // forward
3.         {
4.             Camera.main.orthographicSize = Camera.main.orthographicSize - 0.5f;
5.         }
6.        
7.         if ((Input.GetAxis("Mouse ScrollWheel") < 0) Camera.main.orthographicSize < maxZoom) // back          
8.         {
9.             Camera.main.orthographicSize = Camera.main.orthographicSize + 0.5f;
10.         }
11.         */
12.  

The script compile...but nothing is done when I press play.

 

Sorry, I've been blind:

Code (CSharp):

1.  
2.  if(Input.GetAxis("Mouse ScrollWheel") > 0 &&  Camera.main.orthographicSize > minZoom ) // forward
3. {
4.  
5. }
6.        

Your if statement was badly written. You need && or || operators when combining conditional statements.

 

Great!! they compile now..thanks for the tip, now when I press play only zoom in is allowed with mouse wheel, there is no zoom out ...

 

Have you made the same syntax changes to your other if statement?

 

Yes...my fault, there are three parameters the script has that need to be changed in the Inspector window:

Max zoom:
Min zoom:
Pan Speed:

all was in zero, so changed and seems to be working now..

 

Thanks Andrew, your help is very appreciated.!

 

Can I ask you another question? How can I make zoom go faster?

 

@gmilitel Camera.main.orthographicSize = Camera.main.orthographicSize + 0.5f; change the .5 to something bigger.

hey does anyone know how to modify the code gmilitel posted to work on x and z axis instead of x and y?

 

For anyone that has the same problem.
I change around a little code and just set the y in the transform to a set value works great for a 2D map.

Code (CSharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4.  
5. public class MapCamera : MonoBehaviour {
6.  
7.     private Camera MapCam;
8.  
9.     public float maxZoom;
10.     public float minZoom;
11.     public float panSpeed = -1;
12.  
13.     Vector3 bottomLeft;
14.     Vector3 topRight;
15.  
16.     float cameraMaxY;
17.     float cameraMinY;
18.     float cameraMaxX;
19.     float cameraMinX;
20.     bool CamSet = false;
21.  
22.     void Start()
23.     {
24.         MapCam = this.gameObject.GetComponent<Camera>();
25.         //set max camera bounds (assumes camera is max zoom and centered on Start)
26.         topRight = MapCam.ScreenToWorldPoint(new Vector3(MapCam.pixelWidth, MapCam.pixelHeight, -transform.position.y));
27.         bottomLeft = MapCam.ScreenToWorldPoint(new Vector3(0,0,-transform.position.y));
28.         cameraMaxX = topRight.x;
29.         cameraMaxY = topRight.y;
30.         cameraMinX = bottomLeft.x;
31.         cameraMinY = bottomLeft.y;
32.     }
33.  
34.     void Update () {
35.  
36.         if(Input.GetMouseButton(2))
37.         {
38.             float x = Input.GetAxis("Mouse X") * panSpeed;
39.             float y = Input.GetAxis("Mouse Y") * panSpeed;
40.             transform.Translate(x, 0, y);
41.         }
42.  
43.         if (Input.GetAxis("Mouse ScrollWheel") < 0) //Back
44.         {
45.             if(MapCam.orthographicSize < 95)
46.                 MapCam.orthographicSize = MapCam.orthographicSize + 4;
47.         }
48.         if (Input.GetAxis("Mouse ScrollWheel") > 0) // Forward
49.         {
50.             if(MapCam.orthographicSize > 10)
51.                 MapCam.orthographicSize = MapCam.orthographicSize - 4;
52.         }
53.  
54.             topRight = MapCam.ScreenToWorldPoint(new Vector3(MapCam.pixelWidth, MapCam.pixelHeight, -transform.position.y));
55.             bottomLeft = MapCam.ScreenToWorldPoint(new Vector3(0,0,-transform.position.y));
56.        
57.             if(topRight.x > cameraMaxX)
58.             {
59.                 transform.position = new Vector3(transform.position.x - (topRight.x - cameraMaxX), 165, transform.position.z);
60.             }
61.        
62.             if(topRight.y > cameraMaxY)
63.             {
64.                 transform.position = new Vector3(transform.position.x, 165, transform.position.z - (topRight.y - cameraMaxY));
65.             }
66.        
67.             if(bottomLeft.x < cameraMinX)
68.             {
69.                 transform.position = new Vector3(transform.position.x + (cameraMinX - bottomLeft.x), 165, transform.position.z);
70.             }
71.        
72.             if(bottomLeft.y < cameraMinY)
73.             {
74.                 transform.position = new Vector3(transform.position.x, 165, transform.position.z + (cameraMinY - bottomLeft.y));
75.            }
76.        }
77.    }
78.  

So after a little more testing it turns out this code works perfect for x movement but for the z movement it lets you move infinitely to either side. I don't know what I'm doing wrong, a little help plz?