Question regarding impoly restraint to move about a specified path

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Saikat Banerjee
Saikat Banerjee 2020-6-11
评论： Saikat Banerjee 2020-6-14
Lets say I have an implicit equation in x and y f(x,y)=x^2 + y^2 -5*x +12*y +24 which is an example. I construct an impoly with three or n number of vertices over the curve.My question is how can I restrict the movement of vertices of impoly to be restricted to follow the path of the curve.
  2 个评论
Saikat Banerjee
Saikat Banerjee 2020-6-12
I have already attached example. Read question carefully. Let us say we construct a circle through fimplicit(x^2 + y^2 -5*x +12*y +24). After that we construct a traingle with three vertices using impoly. Now the vertices of the triangle will only move along the Circle. Restrain the movement of vertices using impoly along the circle. It will not go inside the circle or can come out of the circle. It will only move on the curve of the Circle

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采纳的回答

darova
darova 2020-6-13
Use setPositionConstraintFcn function
function main
clc,clear
x = 0:.05:10;
y = sin(x);
plot(x,y,'.-r')
h = impoly(gca,[0:2; sin(0:2)]'); % create impoly on the curve
setPositionConstraintFcn(h,@fcn) % assign constraint
function newPos = fcn(currPos)
d = pdist2([x(:) y(:)],currPos);
[~,ix] = min(d); % find closest points
newPos = [x(ix); y(ix)]'; % constrained position
end
end

更多回答（1 个）

Ameer Hamza
Ameer Hamza 2020-6-12
You can use fimplicit() to get the points on the equation and then pass those points to impoly()
f = @(x, y) x.^2 + y.^2 - 5*x + 12*y + 24;
fi = fimplicit(f, [-3 8 -15 0]);
x = fi.XData;
y = fi.YData;

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