Plot to avoid certain regions in 2D plot

Question

Ananya Malik 2018-11-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/427527-plot-to-avoid-certain-regions-in-2d-plot

评论： Ananya Malik 2018-11-2

I have to plot some random points in 500 x 500 area by avoiding certain area (poly0 and poly1 in the example below) in the 2D-plot.

      x = 350.5; y = 350.5; r = 50;  
      th = 0:pi/50:2*pi;
      xunit = r * cos(th) + x;
      yunit = r * sin(th) + y;
      poly0 = polyshape(xunit(1:end-1),yunit(1:end-1));
      plot(poly0);
      hold on;
      ploy1 = polyshape([100 100 200 200],[100 200 200 100]); %square
      plot(poly1);
      hold on
      loc = randi([1,500],50, 2);

If I do this, random points overlap the poly0 and poly1 areas. Can anyone help? TIA.

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KSSV 2018-11-2

在 MATLAB Online 中打开

x = 350.5; y = 350.5; r = 50;  
      th = 0:pi/50:2*pi;
      xunit = r * cos(th) + x;
      yunit = r * sin(th) + y;
      poly0 = polyshape(xunit(1:end-1),yunit(1:end-1));
      plot(poly0);
      hold on;
      poly1 = polyshape([100 100 200 200],[100 200 200 100]); %square
      plot(poly1);
      hold on
      loc = randi([1,500],50, 2);

There was a typo error. What you want to avoid?

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Answer 1

KSSV 2018-11-2

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/427527-plot-to-avoid-certain-regions-in-2d-plot#answer_344727

编辑：KSSV 2018-11-2

在 MATLAB Online 中打开

Read about inpolygon

x = 350.5; y = 350.5; r = 50;
th = 0:pi/50:2*pi;
xunit = r * cos(th) + x;
yunit = r * sin(th) + y;
poly0 = polyshape(xunit(1:end-1),yunit(1:end-1));
plot(poly0);
hold on;
poly1 = polyshape([100 100 200 200],[100 200 200 100]); %square
plot(poly1);
hold on
loc = randi([1,500],50, 2);
% avoid poly0
idx = inpolygon(loc(:,1),loc(:,2),poly0.Vertices(:,1),poly0.Vertices(:,2)) ;
loc(idx,:) = NaN ;
% avoid poly1
idx = inpolygon(loc(:,1),loc(:,2),poly1.Vertices(:,1),poly1.Vertices(:,2)) ;
loc(idx,:) = NaN ;
plot(loc(:,1),loc(:,2),'.r')