Drawing a rectangle over existing plot

122 次查看（过去 30 天）
gummiyummi
gummiyummi 2020-7-28
回答： Vahidreza Jahanmard 2023-11-14
I have a subplot in Matlab with two plots. (first picture) I want to draw boxes as seen in the second picture, for specific xvalue ranges. I tried annotation however it does not span all plots. Anybody able to help me?
  3 个评论
显示 1更早的评论
gummiyummi
gummiyummi 2020-7-31
Sorry, I didn't put enough detail about what I had tried....
My problem is the dimension [ ] for each annotation. Since, my rectangle is supposed to envelope a specific x value and +- 5 seconds, I do not know how to format that as a varying dimension
Adam Danz
Adam Danz 2020-7-31
编辑：Adam Danz 2020-8-4
That's a clearer problem; and a tough one.
The annotation function has been around for a long time and many people have requested that the function accept location values in data-units rather than normalized figure units. Obviously these wishes have never been granted.
See answer for a cleaner solution.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Adam Danz
Adam Danz 2020-7-31
编辑：Adam Danz 2020-8-3
To use an annotation object in the way you're describing, you'd need to convert the data units, which are relative to the axes, to normalized figure units. Though this is possible, it often leads to headaches since a bunch of minor details turn out to be important such as setting axis limit and figure resizing.
The cleaner approach is to highlight the sections within the axes using the original data units.
Here's a demo that you can apply to your project.
% Set up a figure with two subplots and identical x-axes
figure()
sp(1) = subplot(2,1,1);
x = 0:10:1400;
y = randi(400,size(x))+200;
plot(x, y, '.')
xlim([0,1400])
ylim([200,600])
sp(2) = subplot(2,1,2);
y2 = rand(size(x))*5-1;
plot(x,y2,'.')
linkaxes(sp, 'x') % Link the x axes
ylim([-1,4])
% Define rectangle center and +/-d
rectCnt = 590;
rectDelta = 25; % +/-25 from center
% Draw rectangle in upper axes
rectX = rectCnt + rectDelta*[-1,1];
rectY = ylim([sp(1)]);
pch1 = patch(sp(1), rectX([1,2,2,1]), rectY([1 1 2 2]), 'r', ...
'EdgeColor', 'none', 'FaceAlpha', 0.3); % FaceAlpha controls transparency
% Copy rectangle to 2nd axes and adjust y limits
pch2 = copyobj(pch1, sp(2));
rectY2 = ylim(sp(2));
pch2.YData = rectY2([1 1 2 2]);
If you plan on moving the rectangles around, you can link their XData properties so you only need to change one of them and the other one will follow.
linkprop([pch1, pch2], 'XData')
% now slide the bar to the right by 100 units
% and see what happens...
pch1.XData = pch1.XData + 100;
  15 个评论
显示 13更早的评论
Afiq Azaibi
Afiq Azaibi 2023-3-17
编辑：Afiq Azaibi 2023-3-17
Ran in:
In addition to Adam's solution, starting in R2023a you can use the xregion or yregion functions:
% Set up a figure with two subplots and identical x-axes
figure()
sp(1) = subplot(2,1,1);
x = 0:10:1400;
y = randi(400,size(x))+200;
plot(x, y, '.')
xlim([0,1400])
ylim([200,600])
sp(2) = subplot(2,1,2);
y2 = rand(size(x))*5-1;
plot(x,y2,'.')
linkaxes(sp, 'x') % Link the x axes
ylim([-1,4]);
xregion(sp(1), 565, 615, 'FaceColor', 'r');
xregion(sp(2), 565, 615, 'FaceColor', 'r');
You can also set the EdgeColor properties to emphasize the edges but the default EdgeColor is 'none'.

请先登录，再进行评论。

更多回答（1 个）

Vahidreza Jahanmard
Vahidreza Jahanmard 2023-11-14
To plot the rectangles, you can use this:
% do all your plots
annotation('rectangle',[x y w h]);
for x, y, w, and h, you can plot one time and set the place of the rectangle manually and copy the position to your code

类别

在 Help Center 和 File Exchange 中查找有关 Subplots 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by