#level1_trigonometryExample

Learning Objectives

This openFrameworks Example is designed to demonstrate how to move a point around a circle using sin and cosine and demonstrate angles and radians.

In this example, pay attention to the following code:

• Trig functions that use angles and return values between -1 and 1, cos(angle), sin(angle), tan(angle)
• Trig functions are based on the unit circle that has a radius of one; therefore, the circumference is 2 * radius * PI = 2 * 1 * PI = 2 * PI. openFrameworks has a variable for 2 * PI, TWO_PI
• ofPoint point is used to store the center point of the blue ball; the x and y value of point is changed using cos(angle) & sin(angle)

Expected Behavior

When launching this app, you should see:

• a yellow circle with a small blue circle moving around the circumference of the yellow circle,
• a horiztonal and vertical line attached to the center of the blue ball visualizing sine and cosine angle respectively

Instructions for use:

• Press and release the mouse clicker inside of the yellow circle, and the blue ball will restart its rotation around the yellow ball at this position
• Hold down the mouse clicker and drag your mouse inside of the yellow circle to control the rotation of the blue circle

Other classes used in this file

This Example uses no additional classes.