Databases
StackOverflow2013
Postsdbo
PODrawing line on a CALayer in OSx
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PODrawing line on a CALayer in OSx
    primarykey
    data
    text
    <p>I would like to know if you can help me with painting on layers.</p> <p>The situation is this</p> <p>I am programming on this kind of screen <a href="http://multitouch.com" rel="nofollow">http://multitouch.com</a>, 12 touches simultaneously. In the app I am developing, I can manage multiple images. I can rotate, scale an move at the same time all images (maximum 12 touches on the screen!) To accomplish this I use ONLY layers for performances. Every image is represented by a CALayer, then I create my CALayer's and set the image as its 'contents'. The hierarchy is this.</p> <p>I have only a NSView.</p> <ul> <li>NSView "Container_View"</li> <li>CALayer "Images_Layer" as sublayer of the "Container_View" layer (they have the same frame)</li> <li>CALayer "Img_1_Layer", CALayer "Img_2_Layer", CALayer "Img_3_Layer", etc as sublayer of "Images_Layer"</li> </ul> <p>As I told you before, I can rotate, scale and move my Images.</p> <p>Double tap on a single image, I lock the whole screen, I can still rotate and move the image but ONLY with 2 fingers.</p> <p>Now I would like that user can draw with 1 finger on this image.</p> <p>The main problem is that I have not experience with graphics and all example on internet are about draw line on view.</p> <p>The question is How to draw with a finger on a CALayer. I have only CALayer, I cannot have NSView</p> <p>Many thantk in advance, Sergio</p> <hr> <p>Hi Mazyod, the CALayer class that provides the Image is very big.</p> <p>Please try to understand this context</p> <p>MainWindow as root naturally</p> <p>NSViewController called MainViewController with a custom NSView as root view - this view is called Container and it's set as contentView of the MainWindow</p> <p>CALayer called Images_Layer - it's a layer added as SubLayer of the Container's layer</p> <p>CALayer called Img_Layer - it's a layer added as SubLayer of the Images_Layer (I have one of this for each image, set as contents naturally, then an CGImageRef)</p> <p>When I click on an Image (ImgLayer), 3 methods are fired as usual:</p> <p>onTouchPointDown - with x, y etc onTouchPointMove - with x, y etc onTouchPointUp - with x, y etc</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USSergio Andreotti
    1. USSergio Andreotti
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COYou say your interest is in OS X. Then you are talking about drawing a figure or a line with a finger? Tapping an image? What you say doesn't quite make sense to me.
      singulars
      1. PODrawing line on a CALayer in OSx
      1. USEl Tomato
    2. COSorry for my english, I wanted to explain how my app works. Yes I want to draw with 1 finger on a CALayer that contains an image as its 'contents'. Let's say that I have my CustomLayerImage with 3 method: TouchBegan TouchMove TouchEnd
      singulars
      1. PODrawing line on a CALayer in OSx
      1. USSergio Andreotti
    3. COI would suggest you show some of the code you have so far, so we can start from there. FYI, drawing on a `CALayer` is exactly the same as drawing on a view, with a single difference: instead of using `drawRect:` to draw, you'd use `drawInContext:`
      singulars
      1. PODrawing line on a CALayer in OSx
      1. USMazyod
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload