Using Multiplication to Scale

• • Watch Fun Programing [video 33]

  • Write a program that creates three cars that race across the screen. The speed of each of the cars is chosen randomly at the beginning of the program.

• • Here’s a program skeleton you can use:

float car1_speed;

float car2_speed;

float car3_speed;

float norm_x = 0;

void setup()

{

size(600,400);

car1_speed =

car2_speed =

car3_speed =

}

void draw()

{

background(#FCFAC2);

draw_car(norm_x * car1_speed,100,#FF0000); // red car

draw_car(norm_x * car2_speed,200,#00FF00); // blue car

draw_car(norm_x * car3_speed,300,#0000FF); // green car

norm_x = norm_x + 1;;

}

void draw_car(float x,float y,color carcolor)

{

// Draw a car at location(x,y)

}

• • For extra fun, make your car super fancy, have the program display a text count down to start the race, announce the winner etc.

  • Upload your program to Open Processing

  • Show a mentor, mark the board and claim a prize

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