wpf coordinate system

Question

Hi, I am starting to work with images in WPF and I am using the next pice of code ...

                                    <LineSegment Point="100,-100"/>



                                </PathFigure>
                            </PathGeometry>
                        </GeometryDrawing.Geometry>
                    </GeometryDrawing>
                </DrawingImage.Drawing>
            </DrawingImage>
        </Image.Source>
    </Image>

How ever it seems like the x,y coordinate system is backwards i mean, I learn in math that in the coordinate plane starts at zero at the bottom and goes up higher on the y axis but in WPF it is the reverse. Zero is at the top of the screen and goes up and you go down the y axis

I read about this in a book and in internet but i do not seem to find the logic of this ... any comments why the WPF use this logic?

Thanks !!!!

Answer 1

As far as I know, it's been convention since the early days of graphical computing to measure coordinates from the top-left. Sure, in maths we generally have the origin in the bottom-left, but then it is from the top-left we read (at least in English and other Western languages).

Answer 2

Take a look at this book

Go to the 36th page using control panel of scribd. There is explanation of 2d coordinate system.