Bug #520


Several Bob problems

Added by Brian Flanagan over 3 years ago. Updated almost 3 years ago.

Target version:
Start date:
Due date:
% Done:


Estimated time:
8:00 h
Affected version:


  1. Get Bob appears to get the Bob starting at the wrong origin. (offset by 1 pixel x and y)
  2. Get Bob appears to get the Bob in the wrong size. (appears to be about 3 pixels off x and y)
  3. In Amiga mode, Get Bob is getting an anti-aliased image, but shouldn't be. (Bob should look identical to original.)
  4. Bob appears to draw the bob in the wrong place offset down and right by 1 px. (Is it possible that the Hot Spot origin is off too?)

Similar problems exist in BOTH Amiga and AOZ modes. (See example below)

#manifest: "amiga"
    Bob size & origin issue (RC3)
    Bob also may be placing the Bob offset by 1 pixel X & Y.
    In Amiga mode, Get Bob is anti-aliased.
    (I scaled the display up to make it easier to see the problems.)

    The same problem exists in AOZ moe.
Screen Open 0,800,600,32,Lowres
Screen Scale 5,5
cls 0 : Flash Off : Curs Off
// Draw an 11 x 11 pixel box with an X in it.
Ink 1
Draw 10,10 to 20,20
Draw 10,20 to 20,10
Polyline 10,10 To 20,10 To 20,20 To 10,20 To 10,10

Get Bob 1,10,10 To 20,20 // Get the exact thing that was drawn as a Bob.
Bob 1,30,10,1    // The bob's origin is off by 1 px down and right, and size is off by 3 px x and y.
Wait Key
Get Bob 2,9,9 To 22,22 // I had to move the origin back a pixel (x and y), and increase the size by 3 (x and y)to get the whole box.
Bob 2,50,10,2    // The Bob is drawn 1 pixel down and right from where it should be.
Wait Key
Bob 1,29,9,1    // The bob is restored to where it should be (offset by 1 pixel left and up)
Bob 2,49,9,2    // The bob is restored to where it should be (offset by 1 pixel left and up)
        // Perhaps the Hot Spot is is the wrong place?
Actions #1

Updated by Brian Flanagan over 3 years ago

  • Priority changed from Normal to High

NOTE: In the example given, remember there are Wait Key statements to separate different parts of the test.

Actions #2

Updated by Brian Flanagan over 3 years ago

While testing, you may also want to change the scale to bigger than 5,5 (maybe try 16,16) to more easily see the issues.

Actions #3

Updated by Brian Flanagan about 3 years ago

  • Assignee changed from Francois Lionet to AOZ Developers
  • Estimated time changed from 2:00 h to 8:00 h
  • Affected version changed from Beta RC3 to 1.0.0 (B7)

Get Bob is offset in 1.0.0 (B7).

Palette 0,$FFFFFF,$FF0000,$00FF00,$0000FF,$FFFF00,$00FFFF,$FF00FF
Screen Scale 0,4,4
Curs Off

Pen 1 : Paper 0
Cls 0
For BobNum=1 To 6
  Ink BobNum+1 : Box 1,1 To 10,10
  Get Bob BobNum,1,1 To 11,11
Next BobNum
Cls 0

x = 10 : y = 10
For BobNum=1 To 6
  Bob BobNum,x + BobNum*20, y,BobNum
Next BobNum

The above example will miss the left and top pixels of the object.
If I change the Get Bob to start a 0,0 then the whole object will be grabbed.

Actions #4

Updated by David Baldwin almost 3 years ago

  • Status changed from New to Resolved

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