{"id":2830,"date":"2019-03-25T17:41:25","date_gmt":"2019-03-25T20:41:25","guid":{"rendered":"http:\/\/xexeu.elipse.com.br\/pt\/e3-tips-creating-screen-objects-that-will-not-get-deformed\/"},"modified":"2019-03-25T17:41:25","modified_gmt":"2019-03-25T20:41:25","slug":"e3-tips-creating-screen-objects-that-will-not-get-deformed","status":"publish","type":"post","link":"https:\/\/kb.elipse.com.br\/en\/e3-tips-creating-screen-objects-that-will-not-get-deformed\/","title":{"rendered":"E3 Tips: Creating screen objects that will not get “deformed”."},"content":{"rendered":"
Issue:<\/span>
 
“The problem is that, according to their position on screen, some objects get “deformed”. For example, a test was made with a 150 X 150 circle. When the circle’s position on screen changes, it sometimes looks visibly smaller than its initial size, yet its properties are still 150 X 150. How can I fix this? This also happens when it is necessary to zoom the screen to fit it to the Viewer’s or Frame’s size due to resolution changes, for example.” <\/span>
 
Cause: <\/span>
 
This happens because of the rounding off (truncating) occurring when HIMETRIC coordinates are converted into pixels. In the example, there are two circles with the same HIMETRIC size, 150 X 150: <\/p>\n
    \n
  • Circle1<\/span>:  X=0  Y=0  Coordinates = (0, 0, 150, 150) <\/li>\n
  • Circle2<\/span>:  X=1000  Y=1000  Coordinates = (1000, 1000, 1150, 1150)<\/li>\n<\/ul>\n

    Suppose Zoom is 100%, and the computer’s resolution is an average 96 DPI. To convert HIMETRIC units into pixels, use the following: <\/p>\n

          PIXEL = (HIMETRIC * 96) \/ 2540<\/p>\n

    With this formula, the objects’ coordinates in pixels are: <\/p>\n

      \n
    • Circle1<\/span>:  GrossCoordinatesInPixel = (0, 0, 5.67, 5.67) <\/li>\n
    • Circle2<\/span>:  GrossCoordinatesInPixel = (37.8, 37.8, 43.46, 43.46)<\/li>\n<\/ul>\n

      However, since there are no “half-pixels”, these values are truncated: <\/p>\n

        \n
      • Circle1<\/span>:  TruncatedCoordinatesInPixel = (0, 0, 5, 5), diameter = 5 pixels <\/li>\n
      • Circle2<\/span>:  TruncatedCoordinatesInPixel = (37, 37, 43, 43), diameter = 6 pixels<\/li>\n<\/ul>\n

        Notice that Circle2 <\/span>is 1 pixel larger than Circle1<\/span>!
         
         
        Solution: <\/span>
         
        To fix (or at least minimize) this problem, we have to set the circle’s size as a multiple of a pixel’s exact size. To do so, we must find out a pixel’s size in HIMETRIC: <\/p>\n

             HIMETRIC = (PIXEL * 2540) \/ 96<\/p>\n

        Therefore, 1 pixel = 26,4583333333… HIMETRIC. Since this number is a repeating decimal (3333333…), the circle should be set in multiples of 3 pixels. For example, to have a circle whose “stable size” is a 6-pixel diameter, set the object’s Height = 158,75 and Width = 158,75. Whenever this object moves on screen, its size in pixels will tend to be “stable”: <\/p>\n

              Circle1<\/span>:  X=0  Y=0  Width=158.75  Height=158.75
              HIMETRICCoordinates = (0, 0, 158.75, 158.75)
              GrossCoordinatesInPixel = (0, 0, 6, 6)
              TruncatedCoordinatesInPixel = (0, 0, 6, 6)
              Diameter = 6 pixels<\/p>\n

              Circle2<\/span>:  X=1000  Y=1000  Width=158.75  Height=158.75
              HIMETRICCoordinates = (1000, 1000, 1158.75, 1158.75)
              GrossCoordinatesInPixel = (37.7953…, 37.7953…, 43.7953…, 43.7953…)
              TruncatedCoordinatesInPixel = (37, 37, 43, 43)
              Diameter = 6 pixels
         
        Tip: <\/span>
         
        E3’s own screen editor allows you to created objects with a “stable” size, with no need for all these calculations.
         
        When you need a “stable-sized” object (usually, objects that need to be copied several times on screen, such as an XControl, for example), just turn off the screen editor’s grid and set Zoom in 100% while you create the object with your mouse. The size of objects created with these procedures will always be multiple of one pixel.
         
        PLEASE NOTICE: even if you do follow the tip above and create objects whose size is “stable”, some distortions can still occur due to imprecisions when representing numbers in a float point (minimal precision losses can occur and therefore cause differences in more or less one pixel at the end). <\/span><\/div>\n","protected":false},"excerpt":{"rendered":"

        Issue:  “The problem is that, according to their position on screen, some objects get “deformed”. For example, a test was made with a 150 X 150 circle. 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