Bitmap/Midpoint circle algorithm: Difference between revisions
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(→{{header|REXX}}: added/changed whitespace and comments, simplified the subroutines.) |
m (→{{header|REXX}}: changed a program comment, added/changed comments in the REXX section header.) |
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<br>vertical direction because characters are "taller" than they're "wide", so this REXX version attempts to maintain |
<br>vertical direction because characters are "taller" than they're "wide", so this REXX version attempts to maintain |
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<br>a good aspect ratio. |
<br>a good aspect ratio. |
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The program automatically shows all of the plot's points by finding the minimum and maximum X,Y coördinates. |
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<lang rexx>/*REXX program plots three circles using midpoint/Bresenham's circle algorithm*/ |
<lang rexx>/*REXX program plots three circles using midpoint/Bresenham's circle algorithm*/ |
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@. = '·' /*fill the array with middle─dots char.*/ |
@. = '·' /*fill the array with middle─dots char.*/ |
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/*────────────────────────────────────────────────────────────────────────────*/ |
/*────────────────────────────────────────────────────────────────────────────*/ |
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drawCircle: procedure expose @. minX maxX minY maxY /* [↓] Y is defined as R*/ |
drawCircle: procedure expose @. minX maxX minY maxY /* [↓] Y is defined as R*/ |
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parse arg xx,yy,r 1 y,plotChar; f=1-r; fx=1; fy=-2*r /*get the X,Y |
parse arg xx,yy,r 1 y,plotChar; f=1-r; fx=1; fy=-2*r /*get the X,Y coördinates*/ |
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do x=0 while x<y /*▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒*/ |
do x=0 while x<y /*▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒*/ |
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return</lang> |
return</lang> |
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{{out}} |
{{out}} |
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<pre> |
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<pre style="height:70ex"> |
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