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Topic: Copying rectangles.. (Read 527 times) |
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afarlie
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Copying rectangles..
« Thread started on: Oct 9th, 2013, 2:43pm » |
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First the example code.
10 VDU 23,22,640;480;8,8,16,0
CLS
20 REM DATA
30 MOVE 0,0
40 GCOL 0,1
50 ORIGIN 0,(1024)
60 MOVE 0,0
70 DRAW 99,-99
80
RECTANGLE 0,-99,99,99 TO 100,-200:REM Block copy 100 by 100
RECTANGLE 0,-99,99,99 TO 200,-300
The line should be continuous, with start points being
0,-100 ; 100,-200 ; 200,-300 respectively
The documentation does not say that in block copy operations the dx dy are 'inclusive' or exclusive.
Perhaps someone here would be willing to explain?
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| « Last Edit: Oct 9th, 2013, 5:31pm by afarlie » |
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admin
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Re: Copying rectangles..
« Reply #1 on: Oct 9th, 2013, 3:06pm » |
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on Oct 9th, 2013, 2:43pm, afarlie wrote:| The documentation does not say that in block copy operations the dx dy are 'inclusive' or exclusive. |
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This section of the documentation says that graphics coordinates of a solid rectangle are inclusive of the left and top edges and exclusive of the right and bottom edges:
http://www.bbcbasic.co.uk/bbcwin/manual/bbcwin3.html#pixelsolid
Try changing all the 99's in your program to 100 and see if that gives the results you want.
If not, ask again.
Richard.
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afarlie
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Re: Copying rectangles..
« Reply #2 on: Oct 9th, 2013, 5:30pm » |
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on Oct 9th, 2013, 3:06pm, Richard Russell wrote:
Problem solved.
BTW I will check the first example for sillies..
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