moveBackward
Category:Turtle
Sometimes it is more natural to tell the turtle to moveBackward() in a straight line instead of telling the turtle to moveForward() a negative number of pixels.
Examples
Basic Example
// Move backward 25 pixels (default)
moveBackward();
Example: Letter L
Draw the letter L with moveBackward() and turnLeft() only.
// Draw the letter L with moveBackward() and turnLeft() only.
moveBackward();
moveBackward();
turnLeft();
moveBackward();
Example: Long Line
Move backward 200 pixels.
// Move backward 200 pixels.
moveBackward(200);
Example: Barbell
Draw a barbell using moveForward(), moveBackward() and dot().
// Draw a barbell using moveForward(), moveBackward() and dot().
moveForward(50);
dot(10);
moveBackward(100);
dot(10);
moveForward(50);
Example: Parallel Park the Turtle
Use canvas drawing and moveBackward() to parallel park.
// Use canvas drawing and moveBackward() to parallel park.
speed(10);
createCanvas("id", 320, 480);
setFillColor("yellow");
rect(180, 100, 60, 100);
setFillColor("red");
rect(180, 300, 60, 100);
show();
moveForward(75);
moveBackward(50);
turnLeft(45);
moveBackward(75);
turnRight(45);
moveForward();
Syntax
moveBackward(pixels);
Parameters
| Name | Type | Required? | Description |
|---|---|---|---|
| pixels | number | The number of pixels to move the turtle backward from its current direction. If not provided, the turtle will move forward 25 pixels |
Returns
No return value. Moves turtle only.
Tips
- Use penUp() before calling moveBackward() to have the turtle not draw as it moves.
- The screen default size is 320 pixels wide and 450 pixels high, but you can move the turtle off the screen by exceeding those dimensions.
- There are three ways to move the turtle in a straight line:
- Specify the number of pixels to move the turtle in the direction it is facing using moveForward(pixels) or moveBackward(pixels).
- Specify a number of pixels in the x and y direction to move the turtle using move(x,y), regardless of direction that the turtle is facing.
- Specify an x and y pixel location on the screen to move the turtle to using moveTo(x,y), regardless of direction that the turtle is facing.
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