() 2D , () . . : .
x y (0<= x <= x_max; 0<= y <= y_max).
X Y (0 <= X <= X_max; 0 <= Y <= Y_max).
.
, .
- .
() |
() |
(10,20) |
(5,10) |
AutoCad:
Command: line
from point 5,10
to point 10,20
.
scan- - .
:
1) .
.. . (), . , , , . , .
2) ( )
x y x y . , .
:
1. ;
2. α ≤ 45 (0 ≤ tgα ≤ 1);
3. ;
4. (0, 0) .
:
α tgα |
0<α<45 0<tgα<1 |
-45<α<0 -1<tgα<0 |
45<α<90 tgα>1 |
-90<α<-45 tgα<-1 |
: