How to delete the ellipse of the previous state

Question

han han 2020-7-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/558466-how-to-delete-the-ellipse-of-the-previous-state

回答： Image Analyst 2020-7-2

采纳的回答： Image Analyst

在 MATLAB Online 中打开

I want to implement an input UE ID (edit1) will display an ellipse on axes.

But I want to have only one ellipse on axes.

For example: when I enter UE ID 5 and press pushbutton, and then enter UE ID 6 and press pushbutton, axes only show the ellipse of UE ID 6.

How can I modify it?

function pushbutton2_Callback(hObject, eventdata, handles)
[UELocation] = textread('observe/mdUELocationforGUI2.txt');
InputUEID = get(handles.edit1,'String');
InputUEID = str2double(InputUEID);
InputUEID3 = InputUEID+1;
[Pairlink] = textread('observe/mdPairlinkforGUI2.txt');
Node_ID = Pairlink(InputUEID3,4); %NodeID
Node_ID2 = Node_ID+1;
[UEBeamAngle] = textread('observe/mdUEHBeamAngleforGUI2.txt');
angles_Panel_0 = UEBeamAngle;
[NodeBeam] = textread('observe/mdNodeBeamforGUI2.txt');
Node_beamnumber = NodeBeam(1,3);
[NodeBeamAngle] = textread('observe/mdNodeBeamHAngleGUI2.txt');
    angles = NodeBeamAngle + 60; 
axes(handles.axes1)
hold on
xUECenter=UELocation(InputUEID3,2);
yUECenter=UELocation(InputUEID3,3);
[Nodelocation] = textread('observe/mdNodeLocationXY_axisforGUI2.txt');
ROIX = Nodelocation(1,5);
ROIY = Nodelocation(1,6);
axis([0 ROIX 0 ROIY])
a = 25*ROIX/1000;  %The length and width of the ellipse
b = 25*ROIX/1000;
r = a;
LineSpec='b';
plot_ellipse(a,b,r,xUECenter,yUECenter,angles_Panel_0,LineSpec)
xNodeCenter=Nodelocation(Node_ID2,2);
yNodeCenter=Nodelocation(Node_ID2,3);
r =  a;
LineSpec='k';
plot_ellipse(a,b,r,xNodeCenter,yNodeCenter,angles,LineSpec)
axis equal
function plot_ellipse(a,b,r,xNodeCenter,yNodeCenter,angles,LineSpec) % Draw ellipse function
%write documentation here explaing inputs and usage
hEllipse = imellipse(gca,[-a, -b, 2*a, 2*b]); 
xy = hEllipse.getVertices();
delete(hEllipse)
x = xy(:,1);
y = xy(:,2);
xy = [x y];
for k = 1 : length(angles)
    theta = angles(k);
    rotationArray = [cosd(theta) sind(theta); -sind(theta) cosd(theta)];
    rotated_xy = xy * rotationArray;
    xCenter = xNodeCenter + (r - 0.25) * cosd(theta);
    yCenter = yNodeCenter + (r - 0.25) * sind(theta);
    x = rotated_xy(:,1) + xCenter;
    y = rotated_xy(:,2) + yCenter;
    plot(x, y, LineSpec);
    if k == 1
        grid on;
        hold on;
    end
end

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Answer 1

Image Analyst 2020-7-2

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/558466-how-to-delete-the-ellipse-of-the-previous-state#answer_460138

在 MATLAB Online 中打开

Before you call plot(), call this function:

ClearLinesFromAxes(gca);

Here is the function:

%=====================================================================
% Erases all lines from the image axes "h". 
function ClearLinesFromAxes(h)
axesHandlesToChildObjects = findobj(h, 'Type', 'line');
if ~isempty(axesHandlesToChildObjects)
	delete(axesHandlesToChildObjects);
end
return; % from ClearLinesFromAxes