Lab 7  Mouse Clicks

Task 1, Getting the Mouse Clicks

Write a program that

• Opens a graphics window
• Prints a message at the top telling the user to click on three points.
• Draws a small red  circle at each point. 
• Prints a message at the bottom telling the user to click when done
• Closes the graphics window

Task 2, Custom Circles

Write a modified program that allows the user to specifiy the radii of the circles:

• Opens a graphics window
• Prints a message at the top telling the user to click on three pairs of points.
• Draws a small red  circle at the first point of each pair.
• When the user clicks on the second point of a pair replace the just drawn circle with one with the same center as before, but this time containing the point just clicked.  That means use the second point to determine a new radius, the distance from the center to this point.  The book has had problems about the distance between two points.  This time it is complicated by the fact that the coordinates are recovered with the getX and getY methods.  For example, if the two points are named p1 and p2, the distance between them is
      math.sqrt((p1.getX() - p2.getX())**2 + (p1.getY() - p2.getY())**2)  
  Before drawing the new circle, be sure to undraw the old one.
• Prints a message at the bottom telling the user to click when done
• Closes the graphics window

An alternative, if you prefer, is to just draw a point at the first click in a pair, and only draw a circle on the second click.

Show a TA or pass in your Task 2 if requested instead.

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