nextbackdrop()

Function Definition: nextbackdrop()

  • Python Library: Looks
  • Library Import: sprite = Sprite("Sprite-Name")
  • Mode: Stage Mode

Description

The function changes the backdrop to the next in the list of backdrops, but if the current backdrop is the last in the list, the block will loop to the first.

Parameters

Example

Mouse Tracking and Stamping – Python

The example demonstrates how to make the sprite track and stamp its image on the mouse when the space key is pressed in Python.
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Code

sprite = Sprite('Tobi')
pen = Pen()

pen.clear()

while True:
  if (sprite.iskeypressed("space")):
    sprite.setx(sprite.mousex())
    sprite.sety(sprite.mousey())
    pen.stamp()

Output

Beetle Movement – Python

The example demonstrates using key sensing to control the sprite's movement in Python.
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Code

sprite = Sprite('Beetle')

sprite.setdirection(90)
sprite.gotoxy(0, 0)

while True:
  if sprite.iskeypressed('up arrow'):
    sprite.move(3)
  if sprite.iskeypressed('down arrow'):
    sprite.move(-3)
  if sprite.iskeypressed('left arrow'):
    sprite.left(3)
  if sprite.iskeypressed('right arrow'):
    sprite.right(3)

Output

Ball Movement – Python

The example demonstrates how to add movement to a sprite.
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Code

sprite = Sprite('Ball')

while True:
  if sprite.iskeypressed('up arrow'):
    sprite.changey(3)
  if sprite.iskeypressed('down arrow'):
    sprite.changey(-3)
  if sprite.iskeypressed('left arrow'):
    sprite.changex(-3)
  if sprite.iskeypressed('right arrow'):
    sprite.changex(3)

Sprite Direction – Python

The example demonstrates the sprite direction in Python.
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Code

sprite = Sprite('Arrow1')

sprite.gotoxy(0, 0)
sprite.setsize(300)

while True:
  if sprite.iskeypressed("left arrow"):
    sprite.left(3)
  if sprite.iskeypressed("right arrow"):
    sprite.right(3)
  sprite.say("Direction is " + str(sprite.direction()))

Output

Mouse Tracker – Python

The example demonstrates how to implement mouse tracking in Python.
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Code

sprite = Sprite('Tobi')

while True:
  if (sprite.iskeypressed("space")):
    sprite.goto("_mouse_")

Output

Walking Tobi – Python

The example demonstrates the wall bouncing of the sprite, rotation style, and costume change in Python.
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Code

sprite = Sprite('Tobi')
import time

sprite.setrotationstyle('left-right')

while True:
  sprite.move(5)
  sprite.bounceonedge()
  sprite.switchcostume("Tobi walking 1")
  time.sleep(0.1)
  
  sprite.move(5)
  sprite.bounceonedge()
  sprite.switchcostume("Tobi walking 2")
  time.sleep(0.1)

Output

Follow the Mouse – Python

The example demonstrates how to make the sprite follow the mouse in Python.
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Code

sprite = Sprite('Tobi')

while True:
  sprite.pointto()
  sprite.move(3)

Output

Bouncing Ball with Gravity in Python

The example demonstrates how to add gravity to the project on a bouncing ball.
Download File

Code

sprite = Sprite('Ball')
import time
import random

sprite.setx(random.randrange(-200, 200))
sprite.sety(random.randrange(-100, 140))
gravity = -2
xpos = sprite.x()
ypos = sprite.y()
dx = random.randrange(-50, 50)
dy = random.randrange(-25, 25)

while True:
  dy = dy + gravity
  dx = dx * 0.98
  dy = dy * 0.98
  xpos = xpos + dx
  ypos = ypos + dy

  if ypos < -160:
    dy = -dy
    ypos = -160
  if ypos > 130:
    dy = -dy
    ypos = 130

  if xpos < -220:
    dx = -dx
    xpos = -220
  if xpos > 220:
    dx = -dx
    xpos = 220
  
  sprite.gotoxy(xpos, ypos)
  time.sleep(0.01)

Output

Bouncing an Object

The example demonstrates the bouncing of an object from a bird's eye view in PictoBlox.
Download File

Script

Output

Change costume when Clicked

The example demonstrates the costume change and gliding to the random location when clicked.
Download File

Script

Output

Costumes in PictoBlox

The example demonstrates the costume change in PictoBlox.
Download File

Script

Output

Reciting Table

The example demonstrates how to use a repeat block to recite a table in PictoBlox.
Download File

Sprite

Output

Show and Hide

The example demonstrates the show and hides of the sprite using the buttons.
Download File

Script

Output

Sprite Looks Effects

The example demonstrates the various graphical effects in the PicotBlox - Brightness, color, fisheye, ghost, mosaic, pixelated, and whirl.
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Color

Fisheye

Ghost

Mosaic

Brightness

Pixelate

Whirl

Thinking in PictoBlox

The example demonstrates how to use thinking sprite in a project.
Download File

Script

Output

Sprite Looks Effects – Python

The example demonstrates the various graphical effects in the Python - Brightness, color, fisheye, ghost, mosaic, pixelated, and whirl.
Download File

Code

sprite = Sprite('Tobi')
import time

effect = "COLOR"
# effect = "FISHEYE"
# effect = "WHIRL"
# effect = "PIXELATE"
# effect = "MOSAIC"
# effect = "BRIGHTNESS"
# effect = "GHOST"

sprite.gotoxy(0, 0)
sprite.setsize(200)
sprite.cleareffects()
sprite.seteffect(effect, 0)

while True:
  for i in range(10):
    sprite.changeeffect(effect, 5)
    time.sleep(0.1)
  for i in range(10):
    sprite.changeeffect(effect, -5)
    time.sleep(0.1)

Color

Fisheye

Ghost

 

Mosaic

Brightness

 

Pixelate

Whirl

Show and Hide – Python

The example demonstrates the show and hides of the sprite in Python.
Download File

Code

sprite = Sprite('Tobi')
import time

sprite.gotoxy(0, 0)
sprite.setsize(200)

while True:
  sprite.show()
  time.sleep(1)
  sprite.hide()
  time.sleep(1)

Say and Think with Sprite – Python

The example demonstrates how to use say and think of sprite in a project.
Download File

Code

sprite = Sprite('Tobi')
import time

sprite.say("Saying for 2 seconds", 2)
sprite.say("Saying forever")
time.sleep(2)

sprite.think("Thinking for 2 seconds", 2)
sprite.think("Thinking forever")

Output

Costumes in PictoBlox – Python

The example demonstrates the costume change in PictoBlox.
Download File

Code

sprite = Sprite('Tobi')

sprite.gotoxy(0, 0)
sprite.setsize(200)
sprite.switchcostume("Tobi")

while True:
  sprite.say(sprite.costume("name"), 1)
  sprite.nextcostume()

Output

Reciting Table – Python

The example demonstrates how to use a repeat block to recite a table in PictoBlox.
Download File

Code

sprite = Sprite('Tobi')

sprite.input("Which table you want to recite")
number = int(sprite.answer())

for i in range(1, 10):
  sprite.say(str(number) + " x " + str(i) + " = " + str(number*i), 1)

Output

Bouncing an Object – Python

The example demonstrates the bouncing of an object from a bird's eye view in PictoBlox.
Download File

Code

sprite = Sprite('Tobi')
import time

sprite.gotoxy(0, 0)
sprite.setsize(100)

while True:
  for i in range(10):
    sprite.changesize(sprite.size()/10)
    time.sleep(0.01)
  for i in range(10):
    sprite.changesize(- sprite.size()/10)
    time.sleep(0.01)

Output

Quarky LED Emotion

The example demonstrates the LED emotions of the Quarky.
Download File

Script

Output

Quarky LED Animation

The example demonstrates the various animation of the Quarky LED display.
Download File

Script

Output

Name Badge – Quarky

The example demonstrates how to display scrolling text to make a name badge.
Download File

Script

Output

Display Number 1 to 9 on Quarky

The example demonstrates how to implement a while loop running from 1 to 9 and show it on the Quarky display.
Download File

Script

Output

LED Looping

The example demonstrates how to control the individual LEDs of the Quarky and run patterns using the loops.
Download File

Script

Output

IR Sensor Calibration

The example demonstrates how to calibrate the IR sensors to detect black lines on the white surface.
Download File

Logic

An IR sensor consists of 2 LEDs: one which transmits the IR light and one which receives the IR light. When the IR rays are transmitted, they bounce from the nearest surface and get back to the receiver LED. That’s how an IR sensor detects an object.

But to detect colors, we depend on the number of rays the surface reflects:

  1. The dark surface will absorb more IR rays and as a result, the receiver will get fewer IR rays.
  2. White or shiny objects will absorb fewer IR rays and as a result, the receiver will get more IR rays.

We can get the sensor values in PictoBlox and based on that value we can estimate whether the surface is black or white.

  1. If the sensor detects the black line, its output value is increased. This means that the sensor is active.
  2. If it detects the white area, its output value decreases. This means that the sensor is inactive.

We will call the threshold value above which the sensor detects the black line. If the sensor value is less than the threshold, it means that the sensor hasn’t detected the line yet.

Alert: IR sensors DON’T work in sunlight. IR rays from the sun increase the overall threshold of the sensors therefore they stay active all time. A closed environment or nighttime is the place/time to work with your line following robot.

Script

Calibrating the IR Sensors

Now, run the script by clicking the green flag and bringing the black line of the track close to the IR sensor. One of the following three conditions will happen:

  1. Your calibration value is HIGH: The black region will not be detected in this case. Reduce the calibration value.
  2. Your calibration value is LOW: The white region will not be detected in this case. Therefore, increase the calibration value.
  3. Your calibration value is OK. The white and black regions are detected accurately.

Now modify the script to add the detection value for the right IR sensor.

Output

Random LED Glow on Quarky

The example demonstrates how to create a random colored LED pattern on Quarky.
Download File

Script

Output

LED Control with Keys

The example demonstrates how to control the glowing LED using the keyboard keys.
Download File

Script

Output

Traffic Light on Quarky

The example displays how we can display a custom pattern on the matrix by making a script to display a Traffic Light.
Download File

Script

Output

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