#level1_vectorMathExample

Learning Objectives

This openFrameworks Example is designed to demonstrate vector math 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:

• 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
• 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

Other classes used in this file

This Example uses no additional classes.