DynamicImages3

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.

Problem Techniques Index

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 -------.pl.
$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 # $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); # # translate from graph coordinates to pixel coordinates # $xminpixel = $gr2->ii($xmin); $xmaxpixel = $gr2->ii($xmax); $yminpixel = $gr2->jj($ymin); $ymaxpixel = $gr2->jj($ymax); # # 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 ......, and define the answer to be a formula. 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.

Problem Techniques Index