C# draw rectangle with negative heigth

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Hello, I ve been googling for hours. Please help me! Im having trouble with real time rectangle drawing, Let's say 1st second I want to draw y1 to positive heigth, in 2nd second y1 to negative heigth. But DrawRectangle doesn't except negative values and doesn't draw. I show in drtail in picture please help!

What I have tried:

I have tried giving negative values to DrawRectangle but not working

Posted 7-Dec-16 6:14am

kursatdemir58

Updated 30-Aug-19 21:13pm

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[no name] 7-Dec-16 12:24pm

Probably mostly because rectangles can't have a negative height. Whatever you are doing doesn't make any sense.

[no name] 7-Dec-16 19:04pm

Real time? Drawing a rectangle is always real time. Unless you provide your code and explain better nobody will be able to help.

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Dave Kreskowiak · Answer 1 · 2016-12-07T09:25:00

Solution 1

It would seem kind of obvious to just check to make sure the height is greater than 0 before drawing the rectangle.

Posted 7-Dec-16 9:25am

Dave Kreskowiak

Comments

kursatdemir58 7-Dec-16 16:20pm

My goal is, drawing towards opposite site.

Dave Kreskowiak 7-Dec-16 16:29pm

And exactly what do you mean by "drawing towards opposite site (side?)"?

If you want drawing to actually work with negative numbers, you're going to have to write your own drawing code to translate those negative numbers into something meaningful on a Cartesian coordinate system.

Member 13482508 · Answer 2 · 2019-08-30T21:14:00

I made this function to sort the rectangle so that it will draw.

private Rectangle SortedRect(Point P, Size S)
{
if (S.Width < 0)
{
S.Width = -S.Width;
P.X = P.X - S.Width;
}
if (S.Height < 0)
{
S.Height = -S.Height;
P.Y = P.Y - S.Height;
}
return new Rectangle(P, S);
}