How do you pass coordinates from getrect into a variable?

2016 1 25
2 个回答
更新时间：2016 1 26
4 次查看（30 天）

0 个投票

So I've probably misunderstood this function altogether.
When using GetRect I am trying to return the coordinate and drag distances to a variable. When I do this in my script I can't get it to store the values, only output them to screen.
Simple script I used:
Selection = getrect;
Output I got:
Selection =
-9.6608 -4.0233 4.0111 3.3819
Everytime I seem to instantly lose the values. When I immediately try to access them after they don't exist.

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回答（2 个）

Image Analyst
Image Analyst 2016-1-25

0 个投票

Step through your code a line at a time and figure out when Selection vanishes. You're possibly either doing a clear(), or losing scope. If it's the latter, see the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

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Dustin Gutsche
Dustin Gutsche 2016-1-25
Stepping through shows the variable is never actually created. The very next line I start using the four elements to return the window to my main function. For now I am just directly calling it so I don't know why it's disappearing from memory.
The function getrect is supposed to return a 1x4 vector which I have named Selection then want to use the values from.
Here's my code:
%%Choose the Region
Selection = getrect; % Select the Area of Interest Using a Mouse
%%Results
X_Cut_Min = Selection(1,1);
Y_Cut_Min = Selection(1,2);
X_Cut_Max = Selection(1,3) + Selection(1,1);
Y_Cut_Max = Selection(1,4) + Selection(1,2);
Image Analyst
Image Analyst 2016-1-26
Hard to replicate since I don't have your full code. If you want, you can use rbbox() or imrect() instead - they're essentially the same thing. But rbbox() "finishes" as soon as you lift the mouse button while imrect() lets you adjust the sides before "finishing".

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Dustin Gutsche
Dustin Gutsche 2016-1-25

0 个投票

I feel like I have discovered something. If I separate the 'getrect' part into a separate function it works. I guess this means something about how I am manipulating the figure is incorrect....

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