Databases
StackOverflow2013
Postsdbo
POHow to draw a Perspective-Correct Grid in 2D
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow to draw a Perspective-Correct Grid in 2D
    primarykey
    data
    text
    <p>I have an application that defines a real world rectangle on top of an image/photograph, of course in 2D it may not be a rectangle because you are looking at it from an angle.</p> <p>The problem is, say that the rectangle needs to have grid lines drawn on it, for example if it is 3x5 so I need to draw 2 lines from side 1 to side 3, and 4 lines from side 2 to side 4.</p> <p>As of right now I am breaking up each line into equidistant parts, to get the start and end point of all the grid lines. However the more of an angle the rectangle is on, the more "incorrect" these lines become, as horizontal lines further from you should be closer together.</p> <p>Does anyone know the name of the algorithm that I should be searching for?</p> <p><strong>Yes I know you can do this in 3D, however I am limited to 2D for this particular application.</strong></p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USNeil N
    1. USNeil N
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHow to draw a Perspective-Correct Grid in 2D
      1. USJoshua Carmody
      1. VTFavorite
    2. VO
      singulars
      1. POHow to draw a Perspective-Correct Grid in 2D
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POHow to draw a Perspective-Correct Grid in 2D
      1. This table or related slice is empty.
      1. VTUpMod
    1. COSo an example might be trying to draw a rectangle on a window in a picture?
      singulars
      1. POHow to draw a Perspective-Correct Grid in 2D
      1. USMSN
    2. COyes, that would be an example
      singulars
      1. POHow to draw a Perspective-Correct Grid in 2D
      1. USNeil N
 

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