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#level1_vectorMathExample
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### Learning Objectives
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This openFrameworks Example is designed to demonstrate
[vector math ](http://openframeworks.cc/tutorials/02_maths/001_vector_maths/ ) and how to draw using vectors. Note, a vector represents a direction and magnitude in an abstract "space".
In this example, pay attention to the following code:
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* ```glm::vec3 pts[MAX_N_PTS]` ``, declares a vector named 'pts' that cannot hold more than ` ``MAX_N_PTS` `` which is defined at the top of the header file with ` ``#define MAX_N_PTS` ``
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* ```ofBeginShape()` ``, called to start drawing a new shape.
* ```ofBeginShape()` `` is followed by a list of vertex points, ` ``ofVertex(pts[i].x, pts[i].y)` `` and ends with a call to ` ``ofEndShape()` ``
* ```pts[nPts].x = x` `` & ` ``pts[nPts].y = y` `` sets a specific value position nPts in the vector
### Expected Behavior
When launching this app, you should see:
* a rotating x, y, and z axis in blue; although, only the x and y axis will be visible due to the default orientation of the app
* a mustard yellow legend in the upper left corner with labels for the speed of rotation and rotateAmount in x, y, and z
Instructions for use:
* Hold down the mouse clicker and drag the mouse to draw
* Each point will be stored in vector 'Pts'
* You can rotate the screen using the following key commands:
* A - increase rotation speed
* Z - decrease rotation speed
* S - increase the rotation amount in the x-direction
* X - decrease the rotation amount in the x-direction
* D - increase the rotation amount in the y-direction
* C - decrease the rotation amount in the y-direction
* F - increase the rotation amount in the z-direction
* V - decrease the rotation amount in the z-direction
* Press the mouse once to clear the screen
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### Other classes used in this file
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This Example uses no additional classes.
