import server
mod = server.problems.load_language('robot', 'en')

id = 206
name = 'Count lines'
slug = 'Count lines'

description = '''\
              Write a program to count the color lines on white background using the robot with a color sensor. The robot should drive forward, crossing the lines and count them.
'''

hint = {
    'mW_init':mod.hint['init'],
    'connectMotorLeft':mod.hint['connectMotorLeft'],
    'connectMotorRight':mod.hint['connectMotorRight'],
    'moveSteeringOn':mod.hint['moveSteering']+['''<p>Use move_steering method with 'on' as the first parameter <code>robot.move_steering( 'on',... )</code>.</p>'''],
    'moveSteeringOff':mod.hint['moveSteeringOff'],
    'connectColorSensor':mod.hint['connectColorSensor'],
    'colorSensorMeasure':mod.hint['colorSensorMeasure'],
    'while':['''<p>Use the while loop: inside, the robot should read the current color and increase the counter when the color changes.</p>''',
             '''<p>Interrupt the loop after a certain amount of time; determine the time the robot needs to drive over all the colors experimentally; use <code>time.time()</code>.</p>''',
             '''<p><code>while time.time()-start < 1.5:</code>.</p>'''],
}

plan = ['''\
<p>The program should:</p>
<ol>
  <li>create a mindstorms_widgets() object, which represents the robot in your code.</li>
  <li>connect the driving motors.</li>
  <li>connect the color sensor.</li>
  <li>synchronize the motors and run them so that the robot would move forward.</li>
  <li>inside the loop, let the robot recognize colors and increase the counter.</li>
  <li>interrupt the loop after a certain amount of time.</li>
  <li>stop the motors.</li>
</ol>'''
]