Unit 3: JavaScript Programming in AppLab

penUp()

• the turtle does not draw a line as it moves.
• give a name to a set of actions you want the computer to perform
• Explore the 256^3 possible colors you can choose from using the three required numeric parameters. The fourth optional parameter is the opacity of the color, a percentage between 0 and 1. The default pen color is black, penRGB(0,0,0), and the pen is by default in the down (drawing) position.
• Moves the turtle forward a given number of pixels in the current direction.

turnLeft(angle)

• Rotates the turtle left by the specified angle. The turtle’s position remains the same.
• Returns a random number in the closed range from min to max.
• Moves the turtle forward and to the right in a smooth circular arc.
• Relocates the turtle to a specific (x,y) position on the screen.

moveForward(pixels)

• Moves the turtle forward a given number of pixels in the current direction.
• Rotates the turtle left by the specified angle. The turtle’s position remains the same.
• give a name to a set of actions you want the computer to perform
• the turtle does not draw a line as it moves.

penDown()

• the turtle draws a line behind it as it moves.
• Moves the turtle forward and to the left in a smooth circular arc.
• Moves the turtle forward a given number of pixels in the current direction.
• Changes the turtle's direction to a specific angle. 0 is up, 90 is right, 180 is down, and 270 is left. The turtle's position remains the same.

function myFunction() {}

• give a name to a set of actions you want the computer to perform
• the turtle does not draw a line as it moves.
• Relocates the turtle to a specific (x,y) position on the screen.
• Moves the turtle forward and to the left in a smooth circular arc.

myFunction()

• Calls a user defined function that may or may not take one or more parameters, and optionally generates a return value.
• Moves the turtle forward a given number of pixels in the current direction.
• Changes the turtle's direction to a specific angle. 0 is up, 90 is right, 180 is down, and 270 is left. The turtle's position remains the same.
• Sets the thickness of the line in pixels that the turtle draws behind it as it moves.

moveTo(x,y)

• Relocates the turtle to a specific (x,y) position on the screen.
• Calls a user defined function that may or may not take one or more parameters, and optionally generates a return value.
• Moves the turtle forward and to the left in a smooth circular arc.
• Returns a random number in the closed range from min to max.

turnTo(angle)

• Changes the turtle's direction to a specific angle. 0 is up, 90 is right, 180 is down, and 270 is left. The turtle's position remains the same.
• Sets the color of the pen used by the turtle for drawing lines and dots.
• Rotates the turtle right by the specified angle. The turtle’s position remains the same.
• Rotates the turtle left by the specified angle. The turtle’s position remains the same.

arcRight(angle, radius)

• Moves the turtle forward and to the right in a smooth circular arc.
• Rotates the turtle right by the specified angle. The turtle’s position remains the same.
• Rotates the turtle left by the specified angle. The turtle’s position remains the same.
• Calls a user defined function that may or may not take one or more parameters, and optionally generates a return value.

arcLeft(angle, radius)

• Moves the turtle forward and to the left in a smooth circular arc.
• the turtle draws a line behind it as it moves.
• the turtle does not draw a line as it moves.
• Rotates the turtle right by the specified angle. The turtle’s position remains the same.