Draw Circle Radius Center Matlab

# Drawing

# Circles

The easiest selection to draw a circle, is - obviously - the rectangle (opens new window) function.

but the curvature of the rectangle has to exist set to one!

The position vector defines the rectangle, the first two values ten and y are the lower left corner of the rectangle. The terminal 2 values define width and height of the rectangle.

The lower left corner of the circle - yeah, this circle has corners, imaginary ones though - is the heart c = [3 3] minus the radius r = ii which is [ten y] = [1 ane]. Width and height are equal to the diameter of the circle, and then width = 2*r; elevation = width;

In example the smoothness of the above solution is not sufficient, there is no style effectually using the obvious mode of cartoon an actual circle by use of trigonometric functions.

# Arrows

Firstly, one tin use quiver (opens new window) , where one doesn't have to deal with unhandy normalized figure units by use of note

Important is the fifth argument of quiver: 0 which disables an otherwise default scaling, as this role is commonly used to plot vector fields. (or use the property value pair 'AutoScale','off')

One tin besides add additional features:

(opens new window)

If different arrowheads are desired, one needs to use annotations (this answer is may helpful How do I alter the arrow head manner in quiver plot? (opens new window) ).

The arrow head size can be adjust with the 'MaxHeadSize' property. It'due south not consequent unfortunately. The axes limits need to be set subsequently.

In that location is some other tweak for adjustable arrow heads: (opens new window)

which y'all can telephone call from your script as follows:

# Ellipse

To plot an ellipse you can use its equation (opens new window) . An ellipse has a major and a pocket-sized axis. Also we want to be able to plot the ellipse on different heart points. Therefore we write a function whose inputs and outputs are:

You can use the following function to get the points on an ellipse so plot those points.

Exmaple:

(opens new window)

# Polygon(s)

Create vectors to agree the x- and y-locations of vertices, feed these into patch.

# Single Polygon

(opens new window)

# Multiple Polygons

Each polygon'southward vertices occupy one column of each of X, Y.

(opens new window)

# Pseudo 4D plot

A (thou x northward) matrix tin be representes past a surface past using surf (opens new window) ;

The color of the surface is automatically set as function of the values in the (m ten n) matrix. If the colormap (opens new window) is not specified, the default 1 is applied.

A colorbar (opens new window) can be added to display the current colormap and bespeak the mapping of information values into the colormap.

In the following example, the z (m x n) matrix is generated by the role:

over the interval [-pi,pi]. The x and y values can be generated using the meshgrid (opens new window) function and the surface is rendered as follows:

(opens new window)

Figure i

Now it could be the instance that additional information are linked to the values of the z matrix and they are shop in another (thou x n) matrix

It is possible to add these additional information on the plot by modifying the way the surface is colored.

This volition allows having kinda of 4D plot: to the 3D representation of the surface generated by the start (yard x n) matrix, the 4th dimension will be represented by the data contained in the second (m x n) matrix.

It is possible to create such a plot by calling surf with 4 input:

where the C parameter is the second matrix (which has to be of the aforementioned size of z) and is used to ascertain the color of the surface.

In the following example, the C matrix is generated by the role:

over the interval [-pi,pi]

The surface generated by C is

(opens new window)

Figure 2

Now we can call surf with four input:

(opens new window)

Figure 3

Comparing Figure one and Figure three, nosotros can notice that:

• the shape of the surface corresponds to the z values (the first (yard x n) matrix)
• the colour of the surface (and its range, given by the colorbar) corresponds to the C values (the start (grand x n) matrix)

(opens new window)

Figure 4

Of class, it is possible to bandy z and C in the plot to have the shape of the surface given by the C matrix and the color given by the z matrix:

and to compare Figure 2 with Figure 4

(opens new window)

# Fast cartoon

In that location are three main ways to do sequential plot or animations: plot(x,y), gear up(h , 'XData' , y, 'YData' , y) and animatedline. If you desire your animation to exist smoothen, you lot demand efficient drawing, and the iii methods are non equivalent.

I get 5.278172 seconds. The plot office basically deletes and recreates the line object each time. A more efficient way to update a plot is to employ the XData and YData properties of the Line object.

Now I get 2.741996 seconds, much amend!

animatedline is a relatively new function, introduced in 2014b. Let'southward see how it fares:

3.360569 seconds, non as good equally updating an existing plot, but still meliorate than plot(ten,y).

Of course, if you have to plot a single line, similar in this example, the 3 methods are almost equivalent and give smoothen animations. But if y'all have more circuitous plots, updating existing Line objects will make a divergence.

cobbclawaste.blogspot.com

Source: https://devtut.github.io/matlab/drawing.html

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