Graph Tool, plotting points

Interactive graphing tool problem that asks the student to plot points.

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Complete Code

Download file: GraphToolPoints.pg

POD for Macro Files

See Also

PG problem file

Explanation

DOCUMENT();

loadMacros('PGstandard.pl', 'PGML.pl', 'parserGraphTool.pl', 'PGcourse.pl');

Preamble

This example shows how to get student input in the form of points by using interactive graphing tools. Load the parserGraphTool.pl macro for this.

$x1 = non_zero_random(-5, 5);
$y1 = non_zero_random(-5, 5);

$x2 = non_zero_random(-5, 5);
$y2 = non_zero_random(-5, 5);

$gt = GraphTool("{point, ($x1, $y1)}", "{point, ($x2, $y2)}")->with(
    availableTools      => ['PointTool'],
    bBox                => [ -11, 11, 11, -11 ],
    showCoordinateHints => 0,
);

Setup

Two points are created at random.

The GraphTool method creates the graph tool object. The only argument is the correct answer. This is a string that contains a list of objects that the student will be expected to graph. Each object is a brace delimited list of the attributes of the object. The first attribute in each list is the type of object to be graphed, point in this case. What the remaining attributes are depend on the type. For a point, there is only one additional attribute which is the point itself.

The ->with method is then used to set options for the GraphTool object. In this case the options that are set are:

  • bBox: This is an array reference of four values xmin, ymax, xmax, ymin indicating the upper left and lower right corners of the visible graph.
  • availableTools: This determines which tools will be available for the student to use.
  • showCoordinateHints: Setting this to 0 turns off coordinate hints, which would show the coordinates of the point the cursor is over.

For more details, see the POD.

BEGIN_PGML
Graph the points [`([$x1], [$y1])`] and [`([$x2], [$y2])`].

[_]{$gt}
END_PGML

Statement

The code [_]{$gt} inserts the GraphTool.

BEGIN_PGML_SOLUTION
Solution explanation goes here.
END_PGML_SOLUTION

ENDDOCUMENT();

Solution

A solution should be provided here.