- #1
Jripe
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How would you go about converting from a Cartesian coordinate plane to one where (0,0) is in the top left hand corner?
Converting between coordinate planes
- Thread starter Jripe
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Homework Help Overview
The discussion revolves around converting coordinates from a Cartesian plane to a system where the origin is positioned at the top left corner of the screen. The context involves understanding how to relate mouse coordinates from a smaller screen to a larger screen's coordinate system.
Discussion Character
- Exploratory, Assumption checking, Problem interpretation
Approaches and Questions Raised
- Participants explore the implications of changing the origin of the coordinate system and discuss how to adjust coordinates accordingly. Questions arise about the meaning of the origin's position and how to translate mouse movements into the larger screen's coordinate framework.
Discussion Status
Participants are actively engaging with the problem, sharing their thoughts on how to approach the conversion of coordinates. Some have begun to brainstorm potential methods, while others are reflecting on the challenges posed by the coordinate system changes.
Contextual Notes
There is mention of specific constraints regarding the movement of an object within screens and how the coordinates are defined relative to different origins. The discussion includes considerations of positive and negative directions in the coordinate systems.
- #2
d_leet
- 1,076
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Jripe said:
What do you mean by the origin being in the top left hand corner?
- #3
- #4
d_leet
- 1,076
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It's still pretty much the same cartesian plane, I guess it's just resized because for whatever purpose that is needed for only requires the fourth quadrant.
- #5
Jripe
- 8
- 0
Ok.. maybe I should have put my question a bit better, with a bit more info on what I need this for.
What I have is an object, inside a screen, that is inside another screen. The object can move, and the screen inside the screen is partially-fixed onto the object. If I move the mouse to the left, the screen will follow it to the left, up until the object is on the very right side of the screen which stops it from moving further.
The objects coordinates are based on the large screens origin, and my mouse coordinates are based on the smaller screens plane, which starts in the top left 0,0.
What I am trying to do is to get the mouses coordinates relative to the larger screen.
What I have is an object, inside a screen, that is inside another screen. The object can move, and the screen inside the screen is partially-fixed onto the object. If I move the mouse to the left, the screen will follow it to the left, up until the object is on the very right side of the screen which stops it from moving further.
The objects coordinates are based on the large screens origin, and my mouse coordinates are based on the smaller screens plane, which starts in the top left 0,0.
What I am trying to do is to get the mouses coordinates relative to the larger screen.
- #6
d_leet
- 1,076
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Jripe said:
I guess you could shift the coordinate axes of the upper left coordinate point to be (0,0) and adjust all other points accordingly.
- #7
Integral
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OP,
Have you got any ideas on how you could accomplish this?
Have you got any ideas on how you could accomplish this?
- #8
Jripe
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I'm getting there. I started off by thinking that if the mouse was at say, (0,0) then it would be a whole screen distance up and to the left so I would say distance x = Screen size - 0 and distance y = Screen size - 0 up until half of the screen. I realize now that this would only work at the maximums (I think) because as you go towards the middle you would be getting half the screen size, which isn't what I want.
I am about to go to bed, so I will give this a bit of thought while going to sleep and then continue on tommorow.
Oh, one other thing I forgot to mention is that up is -ve and down is +ve, right is +ve and left is -ve for the objects coordinates relative to the large screen.
After a little bit of brainstorming, maybe the distance from the middle of the screen. I'm done. Bed.
I am about to go to bed, so I will give this a bit of thought while going to sleep and then continue on tommorow.
Oh, one other thing I forgot to mention is that up is -ve and down is +ve, right is +ve and left is -ve for the objects coordinates relative to the large screen.
After a little bit of brainstorming, maybe the distance from the middle of the screen. I'm done. Bed.
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