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Choosing a Coordinate System

• The default coordinate system for the book's graphics classes:
  • The origin (0, 0) is at the center.
  • x- and y- axis range from -10.0 to 10.0
• The user can reset the coordinate system:

  cwin.coord(x_left, y_top, x_right, y_bottom)
  

• Example:
  
  For the following data, the x-axis should range from 1 to 12, and the y-axis should range from 11 to 33:

  cwin.coord(1, 11, 12, 33);

  Month	Average Temperature	Month	Average Temperature
  January	11	July	33
  February	13	August	32
  March	16	September	29
  April	20	October	23
  May	25	November	16
  June	31	December	12

  Output is now in terms of the new coordinate system:

  cwin << Point(1, 11);
  cwin << Point(2, 13);
  /* etc. */
  

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