Question

Write a program in Qbasic to draw four parallel lines

Answer 1

Answer:

The question is vague, but here's a possibility. Hope that helps.

For a segment (x1,y1)-(x2,y2) you can calculate another segment, n pixels away in a direction represented by angle a this way

x1b = x1 + n cos a

y1b = y1 - n sin a

x2b = x2 + n cos a

y2b = y2 - n sin a