Shape creation

iShape objects store a 2d polygon and are used to represent the shape of an agent or a moveable obstruction for the purposes of PathEngine collision.

The following code (in main.cpp) is used to create three iShape objects:

unique_ptr<iShape> agent_shape;
unique_ptr<iShape> obstruction_shape1;
unique_ptr<iShape> obstruction_shape2;
{
    int32_t array[]=
    {
        8,20,
        20,8,
        20,-8,
        8,-20,
        -8,-20,
        -20,-8,
        -20,8,
        -8,20,
    };
    agent_shape = pathengine->newShape(array, sizeof(array) / sizeof(*array));
}
{
    int32_t array[]=
    {
        30,30,
        30,-30,
        -30,-30,
        -30,30,
    };
    obstruction_shape1 = pathengine->newShape(array, sizeof(array) / sizeof(*array));
}
{
    int32_t array[]=
    {
        10,35,
        20,-20,
        -10,-30,
        -15,32,
    };
    obstruction_shape2 = pathengine->newShape(array, sizeof(array) / sizeof(*array));
}

This is what agents created with these shapes might look like rendered in the testbed:

The agent shape is a regular octagon.
The obstruction 1 shape is an axis aligned square.
The obstruction 2 shape is an irregular quadrilateral.

Note: Agents that can rotate will need to be approximated by regular polygon. Irregular shapes should only be used for agent that do not rotate.