Revision: 12806
http://sourceforge.net/p/plplot/code/12806
Author: andrewross
Date: 2013-12-03 13:03:26 +0000 (Tue, 03 Dec 2013)
Log Message:
-----------
Update tcl version of example 22 consistent with C version.
Modified Paths:
--------------
trunk/examples/tcl/x22.tcl
Modified: trunk/examples/tcl/x22.tcl
===================================================================
--- trunk/examples/tcl/x22.tcl 2013-12-03 13:02:59 UTC (rev 12805)
+++ trunk/examples/tcl/x22.tcl 2013-12-03 13:03:26 UTC (rev 12806)
@@ -15,13 +15,17 @@
set narr 6
set fill 0
- $w cmd plsvect arrow_x arrow_y $narr $fill
- constriction $w
+ $w cmd plsvect arrow_x arrow_y $fill
+ constriction $w 1
set fill 1
- $w cmd plsvect arrow2_x arrow2_y $narr $fill
- constriction $w
+ $w cmd plsvect arrow2_x arrow2_y $fill
+ constriction $w 2
+ constriction2 $w
+
+ $w cmd plsvect NULL NULL 0
+
potential $w
}
@@ -65,7 +69,7 @@
}
# Vector plot of flow through a constricted pipe
-proc constriction {w} {
+proc constriction {w astyle} {
set nx 20
set ny 20
@@ -93,7 +97,7 @@
yg $i $j = $y
set b [expr {$ymax/4.0*(3.0-cos($::PLPLOT::PL_PI*$x/$xmax))}]
if {abs($y) < $b} {
- set dbdx [expr {$ymax/4.0*sin($::PLPLOT::PL_PI*$x/$xmax)*$y/$b}]
+ set dbdx [expr {$ymax/4.0*sin($::PLPLOT::PL_PI*$x/$xmax)*$::PLPLOT::PL_PI/$xmax*$y/$b}]
u $i $j = [expr {$Q*$ymax/$b}]
v $i $j = [expr {$Q*$ymax/$b*$dbdx}]
} else {
@@ -105,13 +109,85 @@
# Plot vectors with default arrows
$w cmd plenv $xmin $xmax $ymin $ymax 0 0
- $w cmd pllab "(x)" "(y)" "#frPLplot Example 22 - constriction"
+ $w cmd pllab "(x)" "(y)" [format "#frPLplot Example 22 - constriction (arrow style %d)" $astyle]
$w cmd plcol0 2
- $w cmd plvect u v -0.5 "pltr2" xg yg
+ $w cmd plvect u v -1.0 "pltr2" xg yg
$w cmd plcol0 1
}
+proc transform { x y } {
+
+ global xmax
+
+ return [list \
+ [expr {$x}] \
+ [expr {$y / 4.0 * (3.0 - cos($::PLPLOT::PL_PI * $x / $xmax) ) }]]
+}
+
+# Vector plot of flow through a constricted pipe
+# with a coordinate transform
+proc constriction2 {w} {
+
+ set nx 20
+ set ny 20
+ set nc 11
+ set nseg 20
+
+ set dx 1.0
+ set dy 1.0
+
+ global xmax
+
+ set xmin [expr {-$nx/2*$dx}]
+ set xmax [expr {$nx/2*$dx}]
+ set ymin [expr {-$ny/2*$dy}]
+ set ymax [expr {$ny/2*$dy}]
+
+ $w cmd plstransform transform
+
+ matrix xg f $nx $ny
+ matrix yg f $nx $ny
+ matrix u f $nx $ny
+ matrix v f $nx $ny
+
+ set Q 2.0
+ # Create data - circulation around the origin.
+ for {set i 0} {$i < $nx} {incr i} {
+ set x [expr {($i-$nx/2+0.5)*$dx} ]
+ for {set j 0} {$j < $ny} {incr j} {
+ set y [expr {($j-$ny/2+0.5)*$dy}]
+ xg $i $j = $x
+ yg $i $j = $y
+ set b [expr {$ymax/4.0*(3.0-cos($::PLPLOT::PL_PI*$x/$xmax))}]
+ u $i $j = [expr {$Q*$ymax/$b}]
+ v $i $j = 0.0
+ }
+ }
+
+ matrix clev f $nc
+ for {set i 0} {$i < $nc} {incr i} {
+ clev $i = [expr {$Q + $i * $Q / ($nc - 1)}]
+ }
+
+ # Plot vectors with default arrows
+ $w cmd plenv $xmin $xmax $ymin $ymax 0 0
+ $w cmd pllab "(x)" "(y)" "#frPLplot Example 22 - constriction with plstransform"
+ $w cmd plcol0 2
+ $w cmd plshades u [expr {$xmin + $dx/2}] [expr {$xmax - $dx/2}] \
+ [expr {$ymin + $dy/2}] [expr {$ymax - $dy/2}] \
+ clev 0.0 1 1.0 0 NULL
+ $w cmd plvect u v -1.0 "pltr2" xg yg
+ $w cmd plpath $nseg $xmin $ymax $xmax $ymax
+ $w cmd plpath $nseg $xmin $ymin $xmax $ymin
+ $w cmd plcol0 1
+
+ $w cmd plstransform NULL
+
+}
+
+
+
# Vector plot of the gradient of a shielded potential (see example 9)
proc potential {w} {
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