Matlab Draw Arc Circle

Send message Hello, I really like your project and I think I have skills to help you. And a part of the circumference is called an Arc. Give the arc necessary color and thickness. Use the PDE Modeler app to create complex 2-D geometries by drawing, overlapping, and rotating basic shapes, such as circles, polygons and so on. This YouTube channel is dedicated to teaching people how to improve their technical drawing skills. This page will help you to do that. I'd like to draw a circle and move it in Matlab plot figure. Small circles can be sketched using one or two strokes, without blocking in any construction lines. While drawing a three arc starting with limits, you can specify the start and endpoint of the arc first and then the third point anywhere on it. The arc is drawn in a counter clockwise direction if radius. For better looking freehand sketched circles of larger sizes, try the construction methods shown here. pdecirc(xc,yc,R) draws a circle with the center at (xc,yc) and the radius R. Without using hold on/off, a separate figure window shows circle, but i want the circle on the image. mean) for different discrete categories or groups. Try drawing arcs and circles graphically using the editor. With center O and radius 5cm draw a circle 2. The Arc command allows you to draw an arc of a circle. Circles, arcs, and ellipses have no transferable linear measurements and this requires you to inscribe the circle, arc, or ellipse in. Exploding an entity. Arcs Drawing In Java. See Semicircle definition. - Useful for visualization of radio frequency and transmission line problems The Smith chart was created by Phillip H. Not to be confused with the geometric and military compass invented by Galileo. Drawing a Circle with a Framing Square and 2 Nails " Squaring the circle " may as yet be an unattainable goal for even the best mathematicians, but the November 2012 edition of The Family Handyman magazine had a tip for how to use a square (of the framing type) and two nails to draw a circle. A collection of M-Files capable of drawing a standard colored smith chart including all the labels and scales which can be found on a standard smith chart. Both arc functions draw the arc counterclockwise from the starting angle to the ending angle and leave the graphics cursor position unchanged. Gents, I have a bugging problem. A circle is named based on the name of the point which is the center. point B and draw an arc which intersects ray l. Draw a Circle in Matlab : MATLAB Code Plot two circles, specified radii, tangent at origin, centers on x axis, and third circle, specified radius,. How can I draw a filled circle? Asked by thanks for the answer but I want just a simple command in matlab to fill a circle that is plotted with specified radius. Create the circle by drawing through the midpoints. Compass, circle and arc technical drawing instrument - download this royalty free Vector in seconds. pdecirc(xc,yc,R) draws a circle with the center at (xc,yc) and the radius R. addcurve only draw bezier curve, but how do I make the curve a 1/4 of a circle? I also tried Shapes. The positive x and y directions refer to right and up on a diagram respectively, and an increase in an angle is a counter-clockwise change, with 0 degrees pointing directly right. Architectural Home Design Software Drawing CAD Arcs, Circles, Ovals and Ellipses. Is there something similar to draw circle arcs? I would like to specify a start angle and end angle and have only that portion of the circle drawn. How to draw a circle in MATLAB? This is a commonly asked question from many MATLAB beginners. Draw two circles using the radius 15mm, with their centers 100mm apart. The circle is only for illustration. There are numerous ways to define an arc, the default method uses three pick points, a start point, a second point and an end point. Circle trading uses entire circles as potential support and resistance level while arc trading uses only the bottom half of the circles (below the red line). Today, someone I know googled for some help drawing a filled circle in MATLAB and asked me what I thought of the code that was found. This point is equal distance from both endpoints of the circle and thus on its perpendicular bisector as is the original point. Similar to plotting a circle, only plots an arc based on its centre, radius and angle span. I have tried multiple regen's and changing the pdmode. hi Huseyin, then you didnt have to accept the answer because the problem is not solved yet , in the code above we used circle's equation, so to draw arc between 200 points, theirs coordinates must satisfy :. If you just mean how to plot a circle in a figure, then this function will draw (an approximation to) a circle with a specified radius, at a specified (x,y) location. Construct segment AB. Check out events at ARC (Artist Resource Centre) Toronto!. Draw a segment from a point on the circle to the center. Learn more about polygons, drawing, line, graphics MATLAB. SketchUp is about making models, not destroying them. Drawing circles in a JavaScript HTML5 Canvas element Submitted by ams on Fri, 02/17/2012 - 21:52 The arc() method is the native way to draw circles in a canvas element. In actuality, this really just creates a regular polygon with num_steps sides. pdecirc(xc,yc,R) draws a circle with the center at (xc,yc) and the radius R. To complete the circle, we have to find its center and radius. The inputs can be scalar or column vectors. Tip: Use the stroke() or the fill() method to actually draw the arc on the canvas. You define a surface patch by clicking the bounding arcs. MATLAB: How to plot a circle Ever wonder why there is no circle function when there is a rectangle function? If you can draw a circle using rectangle function, why would you need a circle function?. The following code produces an ellipse that looks more like a "tomato" in the sense that it is wide for how tall it is. Exactly what are you trying to do, something like this?. But some of the arc of the circle has gone missing due to some colors overlapped the arc color. PER PERpendicular point to line, arc or circle -- when used with an arc or circle it will draw a line to the surface of the arc or circle heading toward the center point. Draw perpendicular bisectors to the four sides of the parallelogram to locate the centers of the circle or arc. Isometric Circles and Arcs On an isometric drawing, circles appear as ellipses and arcs as elliptical arcs. Toggle Main Navigation. The default mode and the procedure for drawing circle is: Click and drag the Left mouse to indicate the center point followed by releasing the button at the required radius / diameter (depends on what is set on the form). Draw Shapes and Lines. I have a tool for drawing circles and ellipses and rectangles squares and spirals. Drawing an arc on the end of a straight line. Draw light diagonals and mark off the estimated radius-distance on each end. Draw a circle around V of radius r. Matlab Tools for Network Analysis (2006-2011) This toolbox was first written in 2006. This "circle generator" will plot a point on a map -- given a set of coordinates or other location (an airport code, postal code, city/state pair, or coordinate pair) -- and draw a circle, or circles, around that point. 0 A fault-tolerant function for computing a circle's center and radius given three x-y points MATLAB Release. The Draw Shapes block draws rectangles, lines, polygons, or circles on images by overwriting pixel values. This mathematics ClipArt gallery offers 213 illustrations of common geometric constructions. 000 rectangles, it's better to store the orders in the graphics card, then execute the drawing all at once, rather than doing 10. Plot an Arc on a 2D Grid by given radius and Learn more about graph, raduis, end points, circle, arc, faq. Engineering Specialist Allen S. This is because it allows us the opportunity to discuss the “Unit Circle”. please like,share and subscribe for the channel for further videos. 0 A fault-tolerant function for computing a circle's center and radius given three x-y points MATLAB Release. 4) Draw a line thru the intersection points of both circles, snapping to them. But I really like Izhak's entry, and have had many opportunities to use it in the several years since I downloaded it. More than one way to skin a cat. You can either write the function file from scratch or modify the script file of this Tutorial Lesson. To draw an arc or a full circle, choose the Arc/Circle tool in the Toolbox and one of the Geometry Methods offered by the first icon in the Info. Draw Shapes and Lines. The angle and the coordinate of sector's center are specified but the direction of the angle is random. My approach for that so far was to generate the geometry in Processing (Java for creatives. QUA QUAdrant point of arc or circle (top, bottom, right or left side). So here first we define a sine and a cosine wave, then plotting a circle in MATLAB becomes so simple, just plot the sine Vs. To create an arc with HTML5 Canvas, we can use the arc() method. draw two arcs to intersect at points. Drawing ellipses, circles, arcs, and pie shapes You can draw an ellipse or circle by dragging diagonally with the Ellipse tool, or you can draw an ellipse by using the 3-point ellipse tool to specify its width and height. Toggle Main Navigation. You can find it on the circle dropdown or you can type CIRCLE and then type TTR. Matlab t yp e matlab; to quit, t quit or exit. The first release of the software used only primitive entities such as polygons, circles, lines, arcs and text to construct complex objects. 000 immediate calls to strokeRect() for example. If num_steps is around 30 maybe, it will look close to a circle. I usually use Inventor to create a model from customer supplied blueprints, and then use the model to get the 2D geometry into AutoCAD for further processing. 3) Draw the same type of circle in step 2 whose center is at the point. Then, use Fibonacci ratios to calculate different diameters for the other circle levels. Pick your photoshoot style and let us start drawing your arc. This page shows how to find the center of a circle or arc with compass and straightedge or ruler. 22/05/2014 at 17:39. FTFM: If extent is not a full circle, one endpoint of the arc is the current pen position. The expression executes in the MATLAB workspace. We could use lines as in the triangle to draw ourselves a rectangle, but Cairo has the ability to draw rectangles built-in so we might as well use it: cairo_rectangle (cr, x, y, width, height). Adding shapes to a document can draw attention to something you want to emphasize. io has some documentation on editing shapes with a small example, and a reference to the SVG documentation on drawing arcs, which was the basis for me experimenting until I found the code examples used in this answer. All angles are defined in radians, so drawing a circle is the same as drawing an arc from 0 to 2 * M_PI radians. Make 3 copies of the arc. See also Geometric Functions, Bulge Conversion Functions. ) Measure the arc intercepted AB by the chord by measuring the central angle. Red arc: r = 2 and θ = 2π/3, so s = 4π/3. The second point of the arc snaps to the middle circle in the illustration. If we only want to draw the border or the filling, accordingly, we can omit calling stroke() or fill(). You can specify the angle, center point, direction, or radius of the arc. The transfer characteristics between sine wave and cosine wave will give a circle. To draw a sector of a circle or an ellipse: Open the Ellipses toolbar and click one of the Circle Pie or Ellipse Pie icons. Basically you have to override the style for box-sizing in your canvas. I already asked about circunstances in which I need to draw tangents between circles or drawing arcs for a corner. ) Draw a random chord through your circle with endpoints A and B. Draw an arc of radius r, centered on (x, y), from angle1 to angle2 (in degrees). It is used in two ways. Select where you want the center point to be and then specify the radius of the circle. Place the needle of the compass down on the spot that will be the circle's center point. Is it possible to draw and display circles throughout the multiframe TIFF video (attached) at points (180,183) and (190,203)? Discover what MATLAB. point B and draw an arc which intersects ray l. SketchUp is about making models, not destroying them. To draw a circle or to begin drawing an arc, click on the circle or Ellipse tool and draw your circle Circle or Ellipse Tool To convert the circle into wedges and/or arcs, click on the Edit Nodes Tool, which is immediately below the Selection Tool [Selection Tool is the arrow at the top of the left side menu]   Edit Nodes Tool. Hi everybody. The transfer characteristics between sine wave and cosine wave will give a circle. Fast Circle Drawing 1 Fast Circle Drawing There is a well-known algorithm for plotting straight lines on a display device or a plotter where the grid over which the line is drawn consists of discrete points or pixels. For each of these, draw a second chord parallel to the first, also with endpoints on the arc. For example, typing 20c tells SketchUp to base your arc on a 20-sided circle. I've Already Answered Part A Which Is In The Picture. This damages objects that are behind the erased Line, but Lines are always properly colored. This page will help you to do that. How to draw a circle in MATLAB? This is a commonly asked question from many MATLAB beginners. Drawing Bubble Labels; Drawing Circles in CAD Zone; Was. General Purpose Commands. In the illustration the larger triangle divides the circle with three exact cords of length c for a perfect three pointed star. I want to draw a set of 5 circles with given intersection coordinates with x-axis, where y=0, in same figure. …Also make sure that you're on the object layer,…you can see that in the layers panel…there in the home tab on the. So we're going to draw some circles, arcs, and polygons in the same drawing that we created in the previous video. The input radius is in degrees of arc length on a sphere. Next you are going to make a circular selection, then fill it and stroke it. Default is black. as Feff suggested, Arc tangent to two curves is the command that you need to have a single arc going from the black curve’s end point and tangent to the red circle. Nothing blocks the sun on its arc across the sky. This prototype drawing acts as a template that can be used for all future projects. swing libraries. FTFM: If extent is not a full circle, one endpoint of the arc is the current pen position. The expression executes in the MATLAB workspace. You must properly align isometric circles and arcs with the appropriate isometric plane. Select where you want the center point to be and then specify the radius of the circle. How do I plot a circle with a given radius and Learn more about circle, radius, center, rectangle, overcoming obstacles MATLAB. Rhino for Windows I’m probably missing something but if anyone has a hint to a straightforward way to draw an arc in two. 2 as follows:. On the command line type pedit Click on your arc Tell it "yes" when it asks if you want to turn it into a polyline, the type in CL. We're going to use paremetric equations to describe a circumference in 5 easy steps. i should mention that i need this pie to be a complete one, not just the curved part. Hi, we are completing the arc function in our app, and have coded different methods for drawing an arc, and wanted to know what the most common ones were? For example: 1. Drawing an arc on the end of a straight line. Fit circle through 3 points. This becomes more important when you're filling the circles but it's a good habit to. ArcGIS Desktop Help 9. Edge: You define two points on the polygon edge. Drawing circles in a JavaScript HTML5 Canvas element Submitted by ams on Fri, 02/17/2012 - 21:52 The arc() method is the native way to draw circles in a canvas element. The Ellipse toolbar contains tools for drawing ellipses and circles. You are about to report the project "MATLAB: 2D Mohr's Circle", please tell us the reason. Toggle Main Navigation and then at each side a quarter circle of radius 0. Draw a Circle - Graphing Calculator. with both points, as long as they are both the same distance from the center, that merely gives you a pair of angles. I know that I can calculate the circumference with 2 * radius * PI. arc circle draw Download,Supported file types:svg png ico icns,Icon Author:Gnome Project,Icon instructions:GPL. V ectors and scalars are referred to as n-b y-1 and 1-b y-1 matrices resp ectiv ely. Hi everybody. If you just mean how to plot a circle in a figure, then this function will draw (an approximation to) a circle with a specified radius, at a specified (x,y) location. The first two are the coordinates of the center point of the arc, the third argument is the radius of the arc, and the final two arguments define the start and end angle of the arc. css files are kept same as illustrated in previous video tutorial: Canvas State. , the "natural" way an arc is defined,. None of these let me state the centre point and the radius. Size = (arcXRadius,height) But seems that the height is scaled down when drawn. This can be viewed in the Matlab com-mand window environment by typing: ‘help shape read’, which returns the information shown below. I would like to calculate the arc length of a circle segment, i. "If you need to create lines that are tangent to arcs, or arcs tangent to lines at their endpoints, you can use a function available in AutoCAD since its release. It would be convenient sometimes to be able to draw an arc in tikz by specifying the center of the corresponding circle its radius the initial/final angle i. It glares from the green water, and beams off the pale desert and buckled mountain ranges to the west. from the link: [3. Great for drafting & woodworking two versions available: the inch ruler use to measure & draw curves with radii between 7” to 200” & the metric ruler use to measure & draw 17cm to 500cm. A line segment that goes from one point to another on the circle's circumference is called a Chord. Try to draw all the functions in the same window using the hold. drawCircleArc(ARC); Puts all parameters into one. If we only want to draw the border or the filling, accordingly, we can omit calling stroke() or fill(). The angle formed by the intersection of 2 tangents, 2 secants or 1 tangent and 1 secant outside the circle equals half the difference of the intercepted arcs!Therefore to find this angle (angle K in the examples below), all that you have to do is take the far intercepted arc and near the smaller intercepted arc and then divide that number by two!. An arc is handy to smooth odd shapes or to create splines by using multiple arcs. Fri, Nov 18, 2016, 6:30 PM: Join us Friday night for an uninstructed life drawing class - short poses! We provide easels, boards, tables, chairs and beautiful studio space. After a 35-year wait, Arc Majeur, a monumental 200-ton and 60-meter-tall sculpture in rusted Corten steel by Bernar Venet, one of France’s greatest living artists, has been unveiled. How to draw a circle in MATLAB? This is a commonly asked question from many MATLAB beginners. And the last step is just to make sure that the horizontal and vertical values in the plot have the same. Lets say we have something like this,two circles with different radius. Radius of the circles are 0. I need to write a program in matlab that will draw the olympic circles. Then, draw a second straight line that’s parallel to the first line on the opposite side of the circle. So two points are still ambiguous (unless any of the two satisfies) defining a half circle. The second point of the arc snaps to the middle circle in the illustration. 72 dpi is fine, and you should be in RGB mode. Call the point of intersection, with this arc and the last around P, point Q. I'd like to see a true circle and arc tool. Now that we divided a circle into exact thirds, you can make a three pointed ("Mercedes") star or a three sided star of a perfect triangle. Choose your answers to the questions and click 'Next' to see the next set of questions. Within the survey drawing the lines appear as drawn with no issues at all, however as soon as I xref the topo into my site plan the lines expand into circles. Learn more about arc, draw MATLAB Answers. In this chapter, we will see how to draw a circle on a PDF document using iText library. To draw or graph a point on a number line or on a coordinate plane. So we're going to draw some circles, arcs, and polygons in the same drawing that we created in the previous video. I want to draw a circle using css. To draw a circle, first click the button. Small circles can be sketched using one or two strokes, without blocking in any construction lines. How do I add an arrowhead at t. Come in to read, write, review, and interact with other fans. Draw a chord AB. The art critic Arthur Danto, writing about the controversy over Richard Serra's sculpture "Tilted Arc," offered this description of public art: "Public art is the public transfigured. The colors from left to right are blue, yellow, green and red. The logic behind this program is quite simple, that is we know that the transfer characteristics between Sine wave and Cosine wave will produce a circle. The difference here is that you will be drawing a quarter of the circle. Simpler yet, just draw a circle from the arc center to either end and then delete the arc you don't need. I have converted the image to 8bit pixmap array in grayscale format. An ellipse will be drawn with the sides touching a rectangular box defined by the starting and stopping points of the drag. circles(x,y,r) plots circle of radius r centered at points (x,y). Tangent, Tangent , Tangent. draw two arcs to intersect at points. Comment your code in the comment box below. Here is another question : How to draw a circle given a center(x,y) and radius. AutoCAD drawing command: Arc: Definition: Arc in AutoCAD is primitive object that is part of circle. As far s a circle goes, as Walter points out, surely you can compute the radius of a circle given the center and one point on the circumference. Thanks in advance! EDIT: I would like to draw filled circle arcs too, i. This prototype drawing acts as a template that can be used for all future projects. arc() and Reviewing the Unit Circle. Whether used alone or in combination with other shapes, a circle draws the attention of the reader. Given a point on a line, first draw a circle using this point as its center. As the starting angle is 0 and ends with 180, the arc takes the shape of a semicircle. How to plot a Circle in Matlab 1. 2 points, direction 5. Construct segment. How-to-draw-circle-in-Matlab in MATLAB no direct instructions can be Circle, the procedure is a good Circle procedures. Just downloaded ANSYS SpaceClaim 18. To remove circles that have been previously plotted in an axes, use the cla function. Place the needle of the compass down on the spot that will be the circle's center point. We could use lines as in the triangle to draw ourselves a rectangle, but Cairo has the ability to draw rectangles built-in so we might as well use it: cairo_rectangle (cr, x, y, width, height). Given a point on a line, first draw a circle using this point as its center. If you keep everything else constant and change olny the arc direction, what do you expect to happen? On Mon, 25 Jan 1999 02:57:40 +0200, Gadi Shavit wrote:. CData matrix. Matlab®’s function will plot a reflection coefficient for you, while the script presented here does not. To draw a circle or ellipse, drag the mouse diagonally, using the same motion as when dragging a selection box. So the arc length of the partial circle is six pi, and once again we knew that because it was three fourths of the way around. So why does it have an Explode feature? When you draw a circle, arc, polygon, or curve entity, several segments make up the entity, but selecting any segment selects the whole entity. So far I thought the arc tool was working proportionaly to the number of segments I had defined for a circle but it seems I was wrong and it works with 24 segments if the arc is 360º I see I can change the arc number of segments once it’s drawn through Entity Info, but this way I have to do it for each arc I draw. The pointed leg is used as the centre of a circle or arc. point B and draw an arc which intersects ray l. Matlab® or Octave, the smithchart function or script doesn’t do the \(Z\) to \(\Gamma\) conversion for you. Eyes are just two small circles, capped with diagonal lines for eyebrows. Activity Sheet 1: Angles, Arcs, and Segments in Circles Name Date Complete the following activities, using a dynamic geometry software package. D and E are the points of tangency. Find an answer to your question Circle D is shown with the measure of the minor arcs which angels are congruent 1. Bisecting a Line or Arc B A Construction circles have the same diameter and the radius is equal to more than ½ the length of the line. Circles, Ellipses and Arcs. draw line s through P and Q Note:. AutoCAD drawing command: Arc: Definition: Arc in AutoCAD is primitive object that is part of circle. Not to be confused with the geometric and military compass invented by Galileo. Here is an alternative that works not only for finding the center of a circle from one of its arcs, but also for finding the center of an ellipse: Draw any two non-parallel chords with endpoints on the arc. In this article, we will see how to use the ArcSegment to draw arcs in XAML and WPF. The ellipse or circle is defined by a rectangle that is linked to the diagonal drawn with the mouse. When you apply the Circle method, the CurrentX and CurrentY properties are set to the center point specified by the x and y. We know that perpendicular bisector of a chord passes through the center. If you use the first variant of the function and want to draw the whole ellipse, not an arc, pass startAngle=0 and endAngle=360. That means a lot of people are happy with Zhenhai's effort. The table shows the format for the points input for the different shapes. Tip: To create a circle with arc(): Set start angle to 0 and end angle to 2*Math. Plot an Arc on a 2D Grid by given radius and Learn more about graph, raduis, end points, circle, arc, faq. com # 10-10-2013 Bassano del Grappa Italy #-*- encoding: utf-8 -*- import Rhino import System. When you start a new drawing, you can specify the name of the prototype drawing and all the defaults are taken from this file. 2 - Drawing points, lines, and circles. Small circles can be sketched using one or two strokes, without blocking in any construction lines. hi Huseyin, then you didnt have to accept the answer because the problem is not solved yet , in the code above we used circle's equation, so to draw arc between 200 points, theirs coordinates must satisfy :. To complete the circle, we have to find its center and radius. A circle whose center is on the drawing line and passes through the eyepoint intersects the drawings line at two points, say A and B for which AEB is a right angle. Tip: Use the stroke() or the fill() method to actually draw the arc on the canvas. I want to draw a set of 5 circles with given intersection coordinates with x-axis, where y=0, in same figure. I want to draw a sector of a circle. The angle formed by the intersection of 2 tangents, 2 secants or 1 tangent and 1 secant outside the circle equals half the difference of the intercepted arcs!Therefore to find this angle (angle K in the examples below), all that you have to do is take the far intercepted arc and near the smaller intercepted arc and then divide that number by two!. Another option is to find find an image of an arc and import it into Lucidchart. Here is the code I am using:-. Adding surface patches. We're going to use paremetric equations to describe a circumference in 5 easy steps. If you just mean how to plot a circle in a figure, then this function will draw (an approximation to) a circle with a specified radius, at a specified (x,y) location. DO DONUT / Creates a filled circle or a wide ring. I also want to plot lines that tangent these circles, there is no equation for the lines, all I know is their angle with x-axis (illustration of non-linear Mohr-Coulomb failure envelope). Introduction. How can i do that? Right now im drawing the circle with the rectangle function. While drawing a three arc starting with limits, you can specify the start and endpoint of the arc first and then the third point anywhere on it. i should mention that i need this pie to be a complete one, not just the curved part. Give the arc necessary color and thickness. Label the center A and a point on the circle B. The arc tool (keyboard shortcut A) is used to make arcs. The transfer characteristics between sine wave and cosine wave will give a circle. I have a tool for drawing circles and ellipses and rectangles squares and spirals. Pull the legs of the compass apart until the space between them measures one-half of the desired diameter of your circle. , the "natural" way an arc is defined,. 72 dpi is fine, and you should be in RGB mode. There seem to be several different ways to draw a semi-circle according to google, however none of the answers seem. An arc is handy to smooth odd shapes or to create splines by using multiple arcs. Can someone please provide me equation for drawing an arc?. Then press Enter or Return. The most basic plotting skill it to be able to plot x,y points. But some of the arc of the circle has gone missing due to some colors overlapped the arc color. If you use the first variant of the function and want to draw the whole ellipse, not an arc, pass startAngle=0 and endAngle=360. SketchUp is about making models, not destroying them. Thanks in advance! EDIT: I would like to draw filled circle arcs too, i. The corrdinates of the 1st point and 1 additional component of the 2nd point are not sufficient to define a line. And the last step is just to make sure that the horizontal and vertical values in the plot have the same. This article discusses the code to draw simple shapes like Rectangle, Line, Circle, etc. You can find it on the circle dropdown or you can type CIRCLE and then type TTR. Step 4 - Drawing Cartoon Hands Making up lost time on your cartoon angel, you'll simply draw hands with no fingers holding the. If you are given the two points, and given the centre and radius, then you cannot always do that. The input radius is in degrees of arc length on a sphere. Let r be the circle's radius. It is very hard to place these arc sometimes. Explain the procedure to draw an arc beginning with the center point and having a 60° included angle. So far I thought the arc tool was working proportionaly to the number of segments I had defined for a circle but it seems I was wrong and it works with 24 segments if the arc is 360º I see I can change the arc number of segments once it’s drawn through Entity Info, but this way I have to do it for each arc I draw. If I had some time, I would probably tweak your code and try to plot open intervals on the real line, that's what I really need, but circles are fine too.