QLine to QRect with Margin

[DonCoder]

I have a QLine with A(a0,b0) and B(a1,b1) , where x is a margin. So i should find out final rect coordinates which formed by adding margin to the line AB.

[Christian Ehrlicher]

Create a QTransform to move A to 0,0 (translate) and B to 0,y (rotate, you can get the rotation from QLineF::angle()). Apply the transform to your line.
Then you can calculate the margin points and transform them back with your calculated transform from above.

[DonCoder]

I am new to QTransform, will you eloborate your answer please

[Christian Ehrlicher]

@DonCoder said in QLine to QRect with Margin:

I am new to QTransform,

See the documentation - a little bit of matematics.