资 源 简 介
/* Draw circles of radius 9, 8 and 7 with the colours shown around (0,0)
Draw the x and y axis
Draw the diagonal line
Draw the 12 by 6 quad around (0,0)
When the left mouse button is pressed the diagonal line moves as shown.
When the right button is pressed the diagonal line is reset to its
original position
The right button also toggles the direction from + to - x
Pressing Esc exits the program
*/-/* Draw circles of radius 9, 8 and 7 with the colours shown around (0,0)
Draw the x and y axis
Draw the diagonal line
Draw the 12 by 6 quad around (0,0)
When the left mouse button is pressed the diagonal line moves as shown.
When the right button is pressed the diagonal line is reset to its
original position
The right button also toggles the direction from+ to- x
Pressing Esc exits the program
*/
