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How to draw lines in UIFigure designed in App Designer that contains an image

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Kurt
Kurt 2022-12-12
评论： Voss 2022-12-13
I have seen many examples of how to draw a line in a plot; however, I am working with an App Designer object-oriented UIFigure. The figure contains an image - No axes or any other components. How do I draw lines overlaying my image, from an outside script?
I was using the old bitmapped approach, changing the color of bits in the image, but that way is horribly slow.
classdef sky_frame < matlab.apps.AppBase
properties (Access = public)
UIFigure matlab.ui.Figure
Panel matlab.ui.container.Panel
Image matlab.ui.control.Image
end
methods (Access = Public)
function drawLine(app) % function called externally to draw lines
global xvect; global yvect);
line(xvect, yvect, 'Color', 'yellow');
end
end
methods (Access = private)
function createComponents(app)
app.UIFigure = uifigure('Visible', 'off');
app.Panel = uipanel(app.UIFigure);
app.Image = uiimage(app.Panel);
img = "pattern.png";
app.Image.ImageSource = imread(img);
app.UIFigure.Visible = 'on';
end
end
methods (Access = public)
function app = sky_frame
createComponents(app);
end
end
end
Elsewhere in my code I instantiate my sky_frame:
function scan = initialize_sky()
global scan;
scan = sky_frame;
end
I call a function that draws four vectors to create a rectangle. I have to use this approach because my rectangles may be tilted at various angles.
function draw_box
global scan; % sky_frame object
global xvect; global yvect; % vectors passed to drawLine function
x1 = 141.;
x2 = 141.;
y1 = 491.;
y2 = 508.;
xvect = [x1 x2]; yvect = [y1 y2];
scan.drawLine(); % (I could probably dispense with the globals here)
end
At this point, a new plot window pops up with my line in it. I want the line to be in my "scan" object, not in the plot window.
How do I set the current figure handle to point to my scan object instead of the plot window? I have played around with gcf and gca, but they don't seem to apply to my sky_frame, which only contains an image - no axes. Including the draw_line function in the sky_frame definition as a method is not helping, apparently.
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Voss
Voss 2022-12-13
编辑：Voss 2022-12-13
The image goes in an axes, same as the lines. Like I said before:
"One thing that should work for what you want to do is to use an image (which must be in an axes/uiaxes) instead of a uiimage (which must be in a uifigure/uipanel/etc.)."
I'm not sure what the panel is for; you may not need it.

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采纳的回答

Voss
Voss 2022-12-13
编辑：Voss 2022-12-13
Ran in:
See the example below.
% axes and image
ax = axes();
im = image(ax,'CData',randi([1 255],100,100));
ax.XLim = [0.5 100.5];
ax.YLim = [0.5 100.5];
ax.Visible = 'off';
% line
line(ax,[20 50 85],[50 20 85],'Color','g','LineWidth',10)
The syntax is the same for uiaxes.

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