How to convert Matlab scatterplot axis to display pixels

2017 2 10
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更新时间：2017 4 3
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I am drawing a circle via scatterplot and it plots it in the form of arbitrary units. I want those units to be in pixels so I can run some further algos on them. Imdistline doesn't do much as it only displays the distance in terms of the arbitrary units.

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Adam
Adam 2017-2-10

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Set the XLim and YLim properties of your axes to match the 'Position' property of your axes (doing the obvious maths to go from the start, size represented by position to the start, end needed by xlim and ylim), either relative to the figure (i.e. taken directly from 'Position' with the origin the same) or relative to the axes start (i.e. origin at 0 and x and y lim just set to the size of the axes).
Then draw your circle and it will be in pixel space.

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Walter Roberson
Walter Roberson 2017-2-10
编辑：Walter Roberson 2017-2-12

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You can set the axes Units property to Pixels and set an appropriate Position after that.
This will not affect algorithms though. It would perhaps make it slightly easier to use the figure CurrentPoint property, but normally you would use the axes CurrentPoint property anyhow.

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Waleed Khalid
Waleed Khalid 2017-2-27
编辑：Waleed Khalid 2017-2-27
Yes I tried that but it still manages to translate it into its native axis for some reason For reference here is how I was trying it.
x0=0;
y0=0;
width=500;
height=500;
set(gca,'units','pixels','position',[100,100,250,250])
set(gcf,'units','pixels','position',[x0,y0,width,height])
axis equal;
set(gca,'visible','off');
This gives me a 781x781 image with an axis that doesn;t stay in the coordinates I want it to but rather it has it in its auto-set space
Walter Roberson
Walter Roberson 2017-2-27
It is not clear which coordinates you want. Axes position coordinates are always relative to the figure, but perhaps you are wanting to make them relative to the screen.
Waleed Khalid
Waleed Khalid 2017-4-3
Hi, Sorry for the late reply but yes that is exactly I want so if I export the saved image to a different program, say photoshop, I know the exact coordinates of the plotted points

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