Draw Circle in Matlab Gui

Introduction to Matlab Plot Circle

MATLAB tin can exist used to perform operations involving geometric figures like circles, rectangles, squares etc. In this article, nosotros will focus on circles. We will larn how to create various types of circles in MATLAB. We can create solid or plane circles in MATLAB, which nosotros will larn equally we go alee in the article. We volition also acquire how to create a circle using the rectangle office.

How to Create a circle using Rectangle Function?

Let us first larn syntax to draw a simple circumvolve in MATLAB:

ane. Permit us first declare some points, hither we are taking 500 points. The below lawmaking will create these points.

• angles = linspace(0, ii*pi, 500);

two. Let us now declare the radius and centre of the circle. The centre will be divers by x and y co-ordinates.

• radius = 20;
• CenterX = 50;
• CenterY = 40;

iii. Finally, we will plot our circle.

• x = radius * cos(angles) + CenterX;
• y = radius * sin(angles) + CenterY;

4. We will too write some code for our output to look visually meliorate. This is normal formatting and we can adjust it as per our requirement.

• plot(x, y, 'b-', 'LineWidth', 2);
• hold on;
• plot(CenterX, CenterY, 'k+', 'LineWidth', 3, 'MarkerSize', 14);
• filigree on;
• axis equal;
• xlabel('X', 'FontSize', 14);
• ylabel('Y', 'FontSize', fourteen);

5. This is how our input and output will await like in MATLAB console:

Code:

angles = linspace(0, 2*pi, 500);
radius = twenty;
CenterX = 50;
CenterY = xl;
x = radius * cos(angles) + CenterX;
y = radius * sin(angles) + CenterY;
plot(x, y, 'b-', 'LineWidth', 2);
hold on;
plot(CenterX, CenterY, 'grand+', 'LineWidth', iii, 'MarkerSize', xiv);
grid on;
axis equal;
xlabel('X', 'FontSize', 14);
ylabel('Y', 'FontSize', 14);

Output:

As nosotros tin come across in the above output, the circle is created with a radius 20 and centre (50, 40) equally divers by u.s. in the lawmaking.

How to Create a Solid second Circle in MATLAB?

Next, let us learn how to create a solid 2D circumvolve in MATLAB:

i. First, nosotros will be creating logical paradigm of circle. For this, nosotros will define center, diameter and the image size. Let us first create image.

• imageSizeOfX = 640;
• imageSizeOfY = 480;
• [colInImage rowsInImage] = meshgrid(i : imageSizeOfX, 1 : imageSizeOfY);

2. Next, nosotros will be creating the circumvolve inside the image.

• centerOfX = 320;
• centerOfY = 240;
• radius = 80;
• Pixels = (rowsInImage – centerOfY).^2 …
• + (colInImage – centerOfX).^two <= radius.^2;

3. In the to a higher place line of code, Pixels is "logical" array and is second. Let usa now brandish 'Pixels'.

• image(Pixels);
• colormap([0 0 0; one ane ane]);
• title('Image of circle');

4. This is how our input and output will await similar in MATLAB console:

Code:

imageSizeOfX = 640;
imageSizeOfY = 480;
[colInImage rowsInImage] = meshgrid(ane : imageSizeOfX, 1 : imageSizeOfY);
centerOfX = 320;
centerOfY = 240;
radius = lxxx;
Pixels = (rowsInImage - centerOfY).^2 ...
+ (colInImage - centerOfX).^2 <= radius.^2;
prototype(Pixels);
colormap([0 0 0; 1 ane 1]);
championship('Image of circle');

Output:

How to create a Circle in MATLAB Using Rectangle Role?

Permit us now learn how to create a circle in MATLAB using rectangle function: Here is a simple code to achieve this:

one. Similar we discussed in to a higher place examples, we will declare the radius and center co-ordinates of the required circle.

• radius = 6;
• centerX = 30;
• centerY = 40;
• rectangle('Position',[centerX – radius, centerY – radius, radius*2, radius*ii],…
• 'Curvature',[1,1],…
• 'FaceColor','b');
• axis foursquare;

2. Nosotros have passed 'FaceColor' equally "b" so our output circle volition be of Blue colour.

Code:

radius = 6;
centerX = 30;
centerY = xl;
rectangle('Position',[centerX - radius, centerY - radius, radius*2, radius*2],...
'Curvature',[1,1],...
'FaceColor','b');
axis square;

Output:

How we tin can Create a Unproblematic arc in MATLAB?

Finally, let us talk over how we can create a simple arc in MATLAB. Every bit we know that arc is nothing only a small portion of the circumvolve, code for creating an arc is as well very similar to that of creating a circumvolve.

1. Showtime we define the parameters of required arc.

• xCenter = 1;
• yCenter = i;
• radius = iv;

ii. Side by side, we define the bending theta as required.

• theta = linspace(20, 100, fifty);
• x = radius * cosd(theta) + xCenter;
• y = radius * sind(theta) + yCenter;

three. Finally, we plot our defined points.

• plot(x, y, 'b-', 'LineWidth', ii);
• axis equal;
• grid on;

Code:

xCenter = one;
yCenter = 1;
radius = 4;
theta = linspace(20, 100, fifty);
x = radius * cosd(theta) + xCenter;
y = radius * sind(theta) + yCenter;
plot(x, y, 'b-', 'LineWidth', 2);
centrality equal;
grid on;

Output:

Conclusion

So, in this article, we learnt how to create circles in MATLAB. We can create both plane circles and solid circles in MATLAB. We also learnt how we can leverage the Rectangle role to plot circles in MATLAB. We tin can also format our circle equally per our requirement.

Recommended Articles

This is a guide to Matlab Plot Circle. Hither we talk over an introduction, how to Create a circle using rectangle function, a Solid 2d Circle, a circle in MATLAB and Simple arc. You can besides become through our other related articles to learn more –

1. Break in MATLAB
2. Nested Loop in Matlab
3. Matlab pcolor() | Examples
4. Complete Guide to Optimset Matlab
5. Plot Vector Matlab | Functions
6. Matlab Figure | Examples
7. xlabel Matlab | Examples

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