Box shot 3d 3.6 full
The car should point in the direction in which it is currently moving. 90 degrees (a right angle) is 1/4th of 360, shown below as two perpendicular lines.Ĭreate a simulation of a vehicle that you can drive around the screen using the arrow keys: left arrow accelerates the car to the left, right to the right.
BOX SHOT 3D 3.6 FULL FULL
A full rotation goes from 0 to 360 degrees. You’re probably familiar with the concept of an angle in degrees. The first order of business is to cover radians and degrees. If you have experience with Processing, you’ve undoubtedly encountered this issue while using the rotate() function to rotate and spin objects. Before we can do any of this stuff, we need to make sure we understand what it means to be an angle in Processing. And by taking this break now, we’ll also pave the way for more advanced examples that require trig later in this book.
We’ll start with the basics of angles in Processing and cover many trigonometric topics, tying it all into forces at the end. It’s going to allow us to calculate more complex forces in an environment that involves angles, such as a pendulum swinging or a box sliding down an incline. Trig will teach us about the sine and cosine functions, which when used properly can yield an nice ease-in, ease-out wave pattern. We’ll get to think about angles and angular velocity and acceleration. Trigonometry is going to give us a lot of tools. If we did that, however, we’d skip an important area of mathematics that we’re going to need: trigonometry, or the mathematics of triangles, specifically right triangles. We could move straight from here into topics such as particle systems, steering forces, group behaviors, etc. In Chapters 1 and 2, we carefully worked out an object-oriented structure to make something move on the screen, using the concept of a vector to represent location, velocity, and acceleration driven by forces in the environment.