DynamicImages3
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Dynamic Graphic Images, with Filled Regions
This code snippet shows the essential PG code to check student answers that are equations. Note that these are insertions, not a complete PG file. This code will have to be incorporated into the problem file on which you are working.
| PG problem file | Explanation |
|---|---|
DOCUMENT(); loadMacros( "PGstandard.pl", "PGgraphmacros.pl", # "PGnumericalmacros.pl", # might be useful ); TEXT(beginproblem()); |
Initialization:
To do ..(what you are doing)........., we don't have to change the
tagging and documentation section of the problem file.
In the initialization section, we need to include the macros file |
$xmin = random(-3,-1,1);
$xmax = random(1,3,1);
$ymin = random(-3,-1,1);
$ymax = random(1,3,1);
# filled triangle with dark border
# uses macros provided by WWplot.pm
$gr1 = init_graph(-4,-4,4,4,grid=>[8,8],axes=>[0,0],pixels=>[300,300]);
$gr1->new_color("lightgreen",156,215,151); # RGB
$gr1->new_color("darkgreen", 0, 86, 34);
$gr1->moveTo($xmin,$ymin);
$gr1->lineTo($xmax,$ymin,"darkgreen",2); # bottom edge
$gr1->lineTo($xmin,$ymax,"darkgreen",2); # hypotenuse
$gr1->lineTo($xmin,$ymin,"darkgreen",2); # left edge
$gr1->fillRegion([$xmin+0.1,$ymin+0.1,"lightgreen"]);
# filled rectangle with dark border
# uses some macros directly from GD.pm
#
# first translate from graph coordinates to pixel coordinates
$xminpixel = $gr2->ii($xmin);
$xmaxpixel = $gr2->ii($xmax);
$yminpixel = $gr2->jj($ymin);
$ymaxpixel = $gr2->jj($ymax);
#
$gr2 = init_graph(-4,-4,4,4,grid=>[8,8],axes=>[0,0],pixels=>[300,300]);
$lightblue = $gr2->im->colorAllocate(148,201,255);
$darkblue = $gr2->im->colorAllocate(100,100,255);
$gr2->new_color("lightblue",148,201,255);
$gr2->new_color("darkblue", 100,100,255);
#
# use filledRectangle and rectangle from GD.pm, accessed via ->im->
$gr2->im->filledRectangle($xminpixel,$yminpixel,$xmaxpixel,$ymaxpixel,$lightblue);
$gr2->im->rectangle($xminpixel,$yminpixel,$xmaxpixel,$ymaxpixel,$darkblue);
|
Setup:
We specify that the Context should be Notes: on using this and related Contexts. |
BEGIN_TEXT
$BCENTER
\{ image( insertGraph($gr1), height=>300, width=>300, tex_size=>800 ) \}
$ECENTER
$PAR
$BCENTER
\{ image( insertGraph($gr2), height=>300, width=>300, tex_size=>800 ) \}
$ECENTER
END_TEXT
|
Main Text: The problem text section of the file is as we'd expect. |
$showPartialCorrectAnswers = 1; ENDDOCUMENT(); |
Answer Evaluation: As is the answer. |
