Position Incrementally

[melvington]

Hi all,

Thanks in advance for your help.

First, I'm not a math teacher--don't understand more than addition and subtraction

However, my math teacher friends have identified a "situation" with parameters in the position incrementally action.

This is what I understand about parameter 1--
--represents the X axis
--a positive number moves the object to the right
--a negative number move the object to the left.

The "situation" is with parameter 2, the Y axis. The positive number moves the object down. The negative number moves the object up. Are these reversed?

Is this classic user error? What am I missing?

Please help me, the mathematically challenged, explain Parameter 2.

I've attached a sample for anyone who might be willing to help me.

Thanks,

Myra

[srchlc]

As I understand the parameters, you seem to understand how they work perfectly. Now, do they match how a coordinate plane works? No.

Holli

[melvington]

Thanks, Holli. So maybe it's not just me after all.

Myra

[jepatton]

On a computer screen, the position of a pixel (x, y) refers to its distance from the upper left corner of the screen. For example, a pixel at position (100, 50) would be 100 pixels in from the left and 50 pixels down from the top. As the x-coordinate increases, the pixel moves towards the right side, and as the y-coordinate increases the pixel moves towards the bottom. The "move incrementally" action is consistent with this. It does seem counter-intuitive though (especially for us math teachers!) :):):)

[davidlloyd]

June has it right. The origin on a computer screen is at the top left so positive y parameters move an object down and negative ones move an object up.

It took me a while to get used to it.