88 lines
2.5 KiB
Tcl
88 lines
2.5 KiB
Tcl
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#!/usr/bin/tclsh
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#
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# This script generates a cluster of random polygons that are useful
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# for testing the geopoly extension.
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#
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# Usage:
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#
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# tclsh randomshape.tcl | tee x.sql | sqlite3 >x.html
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#
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# The output files are x.sql and x.html. Run the above multiple times
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# until an interesting "x.html" file is found, then use the "x.sql" inputs
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# to construct test cases.
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#
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proc randomenclosure {cx cy p1 p2 p3 p4} {
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set r 0
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set pi 3.145926
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set pi2 [expr {$pi*2}]
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set x0 [expr {$cx + rand()*$p3 + $p4}]
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set ans "\[\[$x0,$cy\]"
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while {1} {
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set r [expr {$r+$p1+$p2*rand()}]
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if {$r>=$pi2} break
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set m [expr {rand()*$p3 + $p4}]
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set x [expr {$cx+$m*cos($r)}]
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set y [expr {$cy+$m*sin($r)}]
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append ans ",\[$x,$y\]"
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}
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append ans ",\[$x0,$cy\]\]"
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return $ans
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}
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proc randomshape1 {} {
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set cx [expr {100+int(rand()*800)}]
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set cy [expr {100+int(rand()*600)}]
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set p1 [expr {rand()*0.1}]
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set p2 [expr {rand()*0.5+0.5}]
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set p3 [expr {rand()*100+25}]
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set p4 [expr {rand()*25}]
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return [randomenclosure $cx $cy $p1 $p2 $p3 $p4]
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}
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proc randomshape1_sm {} {
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set cx [expr {100+int(rand()*800)}]
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set cy [expr {100+int(rand()*600)}]
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set p1 [expr {rand()*0.1}]
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set p2 [expr {rand()*0.5+0.5}]
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set p3 [expr {rand()*10+25}]
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set p4 [expr {rand()*5}]
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return [randomenclosure $cx $cy $p1 $p2 $p3 $p4]
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}
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proc randomshape2 {} {
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set cx [expr {400+int(rand()*200)}]
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set cy [expr {300+int(rand()*200)}]
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set p1 [expr {rand()*0.05}]
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set p2 [expr {rand()*0.5+0.5}]
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set p3 [expr {rand()*50+200}]
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set p4 [expr {rand()*50+100}]
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return [randomenclosure $cx $cy $p1 $p2 $p3 $p4]
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}
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proc randomcolor {} {
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set n [expr {int(rand()*5)}]
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return [lindex {red orange green blue purple} $n]
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}
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puts {.print '<html>'}
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puts {.print '<svg width="1000" height="800" style="border:1px solid black">'}
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puts {CREATE TABLE t1(poly,clr);}
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puts {CREATE TABLE t2(poly,clr);}
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for {set i 0} {$i<30} {incr i} {
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puts "INSERT INTO t1(rowid,poly,clr)"
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puts " VALUES($i,'[randomshape1]','[randomcolor]');"
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}
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for {set i 30} {$i<80} {incr i} {
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puts "INSERT INTO t1(rowid,poly,clr)"
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puts " VALUES($i,'[randomshape1_sm]','[randomcolor]');"
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}
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for {set i 100} {$i<105} {incr i} {
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puts "INSERT INTO t2(rowid,poly,clr)"
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puts " VALUES($i,'[randomshape2]','[randomcolor]');"
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}
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puts {DELETE FROM t1 WHERE geopoly_json(poly) IS NULL;}
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puts {SELECT geopoly_svg(poly,
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printf('style="fill:none;stroke:%s;stroke-width:1;"',clr))
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FROM t1;}
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puts {SELECT geopoly_svg(poly,
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printf('style="fill:none;stroke:%s;stroke-width:2;"',clr))
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FROM t2;}
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puts {.print '<svg>'}
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