android - Magnifying part of the canvas when touched -


I have a custom view that spreads SurfaceView I am pulling a picture on the canvas when the user touches a point on the canvas , Then I want to show a big view of the area around the touched coordination. And preferably, as it rotates around the finger, accordingly, I would like to update the contents of magnified scenes.

I was wondering if the Android platform has supported this kind of functionality basically if any, then none of you can tell me a good example that I started to share or share ideas. How to apply it. I do not do such a lot of 2D or 3D graphics and still trying to understand the canvas and matrix classes what I can use.

I searched for the same question for anyone who searched the forum. Therefore, pls does not flag to ask me a question already present.

No more - I am not using OpenGL-E or any such third party library (yet).

Thanks all.

To zoom the image that you are portraying on the canvas: < P> Create a bitmap shader (using bitmap of image), a matrix and a paint: 

  shader = new bitmapshader (BMP, tile mode. Clipper, tile mode. Clamp); Matrix = new matrix (); ShaderPaint = new paint (); ShaderPaint.setShader (Shader);   
 Record touch status on touch events (eg in one point):  
  ZoomPos. X = event.getX (); ZoomPos.y = event.getY ();   
 ... and set up the matrix of shader (I do this on every touch, maybe a better way):  
  matrix .set (); Matrix. PostScale (2f, 2f); Matrix. PostTranslate (-zoomPos.x, -zoomPos.y); Shader.setLocalMatrix (matrix);   
 Then in the drawing code, create a circle using shader paint.  
  canvas.drawCircle (zoomPos.x, zoomPos.y, size_of_the_circle, shaderPaint);    matrix. PostTranslate (-zoomPos.x, -zoomPos.y);   
 can be changed with one:  
  matrix. PostScale (2f, 2f, zoomPos.x, zoomPos.y);   
 This can change the scale factor without breaking the offset.

Comments

Post a Comment

Popular posts from this blog

Python SQLAlchemy：AttributeError: Neither 'Column' object nor 'Comparator' object has an attribute 'schema' -

I tried to create a new database in my project, but when I run the script, I get this error, I have another project, this type of definition worked before, but now it gets a single error. I am using Python 2.7.8 and the version of SQLAlchemy module is 0.9.8. By the way, using a project flask- SQLAlchemy, it works well, I'm confused. Traceback information is as follows: Traceback (most recent call final): File "D: / Projects / IOM / db_create.py", line 4, & lt; Module & gt; From the models the base file "D: \ Projects \ OO-IM \ models.py", in line 15, in the & lt; Module & gt; Column ( 'followed_id', int (), ForeignKey ( 'user.id')) file "C: \ Python27 \ lib \ site-packages \ SQLAlchemy \ SQL \ schema.py", line 369, __new__ schema = metadata. Schema file "C: \ Python27 \ lib \ site-packages \ SQLAlchemy \ SQL \ elements.py", line 662, AttributeError in __getattr__ key): Neither 'column' object nor ...
Read more

java - How not to audit a join table and related entities using Hibernate Envers? -

I use Eners to be hibernate to audit my institutions. I have an audit entity, Foo , which includes a list & lt; Bars & gt; However, I do not want to audit the bar institutions, in the form of properties, I have written that: @inti @edicated public class Foo {@JoinTable (name = "T_FOO_BAR", joinColumns = @JoinColumn (name = "FOO_ID"), inverseJoinColumns = @JoinColumn (Name = "BAR_ID")) @ManyToMany (Cascade = Persist) @ Indited (targetAuditMode = RelationTargetAuditMode.NOT_AUDITED ) Public listing & lt; Bars & gt; GetBars () {Return bars; }} Now, I want to retrieve an amendment of foo : AuditReader reader = AuditReaderFactory.get (GetEntityManager ()); FU modification = (FU) reader.CreativeTeA () .entensEtrevision (Foo Class, 42) .getSingleResult (); Unfortunately, when I want to retrieve all the data (i.e. when it loads lazy times ), error me ORA-00942: table or view is not present , because Tried to query this: Sel...
Read more

mongodb - CakePHP paginator ignoring order, but only for certain values -

While pagging my user model in kppp, I can sort with some values, but not others. For example, I can order results from created or email , for example, but username or reputation seems to come back order by arbitrary command for example with a list of users: $ this-> paginate = array ('condition' => array ( 'User.is_active' = & gt; true), 'border' => 24, 'order' => array ('User.created' => DESC)); Works as expected, but $ this - & gt; Paged = array ('conditions' = & gt; array (' user.isIactive '= & gt; true),' border '= & gt; 24,' command '= & gt; array (' user repeats' = ' & Gt; DESC ')); No, no. I first thought that this could be a database issue, but when I search the database directly, sorted as expected. Note: I am using Mangodebi with the Mongo DB plugin of Ichikawa for the KPPHP; Pagnetizing users are used to work properl...
Read more