Python draw rectangle with coordinates

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PyGame Drawing Basics

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am trying to have python 2. I know there are simpler way of drawing a rectangle but I am trying to do it only using corner coordinates.

I know this is probably something simple but I am having trouble figuring out what I'm doing wrong so any help would be appreciated. I use the turtle module, not turtlegraphics but my guess is these two lines are at issue:. There are many different ways to implement what you're trying to do, here's one using the turtle module that comes with Python:. Learn more. Asked 3 years, 7 months ago. Active 3 years, 7 months ago. Viewed times. After running my current code I get the following: TypeError: can't multiply sequence by non-int of type 'float' I know this is probably something simple but I am having trouble figuring out what I'm doing wrong so any help would be appreciated.

My code is as follows: from turtlegraphics import Turtle def drawLine t1,x1,y1,x2,y2 : t1. CFalco CFalco 19 4 4 bronze badges. Active Oldest Votes. I use the turtle module, not turtlegraphics but my guess is these two lines are at issue: t2.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.To draw a line, you need to pass starting and ending coordinates of line.

We will create a black image and draw a blue line on it from top-left to bottom-right corners. To draw a rectangle, you need top-left corner and bottom-right corner of rectangle.

This time we will draw a green rectangle at the top-right corner of image. To draw a circle, you need its center coordinates and radius. We will draw a circle inside the rectangle drawn above. To draw the ellipse, we need to pass several arguments.

One argument is the center location x,y. Next argument is axes lengths major axis length, minor axis length. For more details, check the documentation of cv2. Below example draws a half ellipse at the center of the image.

To draw a polygon, first you need coordinates of vertices. Here we draw a small polygon of with four vertices in yellow color. If third argument is Falseyou will get a polylines joining all the points, not a closed shape. Just create a list of all the lines you want to draw and pass it to the function. All lines will be drawn individually. It is more better and faster way to draw a group of lines than calling cv2.

So it is time to see the final result of our drawing. As you studied in previous articles, display the image to see it.

OpenCV-Python Tutorials latest.ImageDraw module of the Python image processing library Pillow PIL provides a number of methods for drawing figures such as circle, square, and straight line. Prepare an Image object of a background image image for drawing a figure and use it to create a Draw object. Don't forget to import Image and ImageDraw.

Drawing a Shape - Python - Tutorial 4

Here, create a solid image with Image. The mode, size, and fill color are specified in parameters. Draw an ellipse, a rectangle, and a straight line as an example. The parameters will be described later.

In linepolygonand pointmultiple coordinates are specified instead of two points representing a rectangular area. The specification format of color is the same as fill above. The default is None no border. As of version 4. See the official document for details.

Specifying a square results in a true circle. The example of lines linepolygon polygonpoint point is as follows. Since the point is 1 pixel, it is hard to see but it is drawn on the right side. An arc, a chord bowand a pie touching the rectangular area specified by the argument xy are drawn.

Example of arc arcchord chordpie pieslice is as follows. In the previous examples, figures are drawn on the solid image generated by Image. If an existing image file is read by Image.

Draw im draw. Python Pillow Image Processing.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I have been trying to figure this out all day.

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How to draw a rectangle around the x,y coordinates given for the center of the rectangle all the while using the Height and width given from the user. You just need to compute the coordinates of all four corners of your rectangle.

Go to the first corner with the pen up, and then go through all the corners in a certain order, for example clockwise. For the future, it's probably helpful to remember that if you want a picture around a certain point like your centerthen you probably all the coordinates you move through will be relative to it, and so will include its value.

Learn more. Python: Drawing a rectangle around center coordinates given by user while using imported height and width Ask Question. Asked 4 years, 7 months ago.

python draw rectangle with coordinates

Active 4 years, 7 months ago. Viewed 5k times. Kenneth Luiggi Kenneth Luiggi 19 1 1 silver badge 5 5 bronze badges. Active Oldest Votes.

I ended up with this exact solution this morning thank you for the help! Screen turtle. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.

python draw rectangle with coordinates

The Overflow Blog. Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow.Graphics make programming more fun for many people. To fully introduce graphics would involve many ideas that would be a distraction now. This section introduces a simplified graphics module developed by John Zelle for use with his Python Programming book.

My slight elaboration of his package is graphics. You need the file graphics.

Draw circle, rectangle, line etc with Python, Pillow

Be sure to save any graphics program you write in such a folder like my examples folder. The easiest way to ensure this is to start in the desired folder, as discussed in Starting Idle for Editing. To work on the most systems, this version of graphics.

There is an issue with the use of multiple threads of execution. You will just be a user of the graphics. It uses all sorts of features of Python that are way beyond these tutorials. There is no particular need to open graphics. Load into Idle and start running example graphIntroSteps. Each time you press return, look at the screen and read the explanation for the next line s. Bring it to the top, and preferably drag it around to make it visible beside your Shell window.

The assignment statement remembers the window object as win for future reference. This will be our standard name for our graphics window object.

A small window, by pixels is created. A pixel is the smallest little square that can by displayed on your screen. Modern screen usually have more than pixels across the whole screen. This creates a Point object and assigns it the name pt. Unlike when a GraphWin is created, nothing is immediately displayed: In theory you could have more than one GraphWin. Zelle designed the graphics module so you must tell Python into which GraphWin to draw the Point.

A Point object, like each of the graphical objects that can be drawn on a GraphWinhas a method [1] draw. Now you should see the Point if you look hard in the Graphics Window - it shows as a single, small, black pixel. Graphics windows have a Cartesian x,y coordinate system. The dimensions are initially measured in pixels. The first coordinate is the horizontal coordinate, measured from left to right, so is about half way across the pixel wide window.

The second coordinate, for the vertical direction, increases going down from the top of the window by default, not up as you are likely to expect from geometry or algebra class. We will see later that we can reorient the coordinate system to fit our taste.

Henceforth you will see a draw method call after each object is created, so there is something to see. The first line creates a Circle object with center at the previously defined pt and with radius This object is remembered with the name cir. As with all graphics objects that may be drawn within a GraphWinit is only made visible by explicitly using its draw method.

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So far, everything has been drawn in the default color black.If you see any errors or have comments, please let us know. All rights reserved. Before we begin programming with Processing, we must first channel our eighth grade selves, pull out a piece of graph paper, and draw a line.

The shortest distance between two points is a good old fashioned line, and this is where we begin, with two points on that graph paper.

python draw rectangle with coordinates

The above figure shows a line between point A 1,0 and point B 4,5. If you wanted to direct a friend of yours to draw that same line, you would give them a shout and say "draw a line from the point one-zero to the point four-five, please.

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The same command applies only this time you can skip the pleasantries and you will be required to employ a precise formatting. Here, the instruction will look like this:.

The vast majority of the programming examples you'll see with Processing are visual in nature. These examples, at their core, involve drawing shapes and setting pixels. Let's begin by looking at four primitive shapes. For each shape, we will ask ourselves what information is required to specify the location and size and later color of that shape and learn how Processing expects to receive that information.

In each of the diagrams below, we'll assume a window with a width of 10 pixels and height of 10 pixels. This isn't particularly realistic since when you really start coding you will most likely work with much larger windows 10x10 pixels is barely a few millimeters of screen space. Nevertheless for demonstration purposes, it is nice to work with smaller numbers in order to present the pixels as they might appear on graph paper for now to better illustrate the inner workings of each line of code.

A point is the easiest of the shapes and a good place to start.

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To draw a point, we only need an x and y coordinate. A line isn't terribly difficult either and simply requires two points: x1,y1 and x2,y2 : Once we arrive at drawing a rectthings become a bit more complicated. In Processing, a rectangle is specified by the coordinate for the top left corner of the rectangle, as well as its width and height.

A second way to draw a rectangle involves specifying the centerpoint, along with width and height. If we prefer this method, we first indicate that we want to use the "CENTER" mode before the instruction for the rectangle itself. Note that Processing is case-sensitive. Finally, we can also draw a rectangle with two points the top left corner and the bottom right corner.

Once we have become comfortable with the concept of drawing a rectangle, an ellipse is a snap. In fact, it is identical to rect with the difference being that an ellipse is drawn where the bounding box of the rectangle would be. Processing has a built-in methodology for selecting which pixels should be used to create a circular shape.

Zoomed in like this, we get a bunch of squares in a circle-like pattern, but zoomed out on a computer screen, we get a nice round ellipse. Processing also gives us the power to develop our own algorithms for coloring in individual pixels in fact, we can already imagine how we might do this using "point" over and over againbut for now, we are content with allowing the "ellipse" statement to do the hard work.

For more about pixels, start with: the pixels reference pagethough be warned this is a great deal more advanced than this tutorial. Now let's look at what some code with shapes in more realistic setting, with window dimensions of by Note the use of the size function to specify the width and height of the window. Cover Reference Tutorials Examples Bugs.

Coordinate Space Before we begin programming with Processing, we must first channel our eighth grade selves, pull out a piece of graph paper, and draw a line. Here, the instruction will look like this: line 1,0,4,5 Even without having studied the syntax of writing code, the above statement should make a fair amount of sense.

We are providing a command which we will refer to as a "function" for the machine to follow entitled "line.Strictly speaking, import sys is not needed for PyGame, but as we'll see later, to be able to use the "close window" button on Windows or Mac, we'll need to use sys. Changes you make to the screen—e. Remember that after you draw, you have to call pygame. The first way is illustrated below. This function actually draws a house. First it forms a list of points, and then it uses them to draw the house by calling pygame.

Note that we have a function call to makeHouseFrame as the fourth argument to the pygame. At first, it may seem like this is not progress. We've turned a simple five line function into two functions, and fourteen lines of code—that do the very same thing.

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Restructuring our code like this is an example of "refactoring" discussed in section 4. What is it that we want to do over and over? Each time through the loop, we need to look for quit events and if we find one, we need to quit the program:. One simple way to slow things down is to insert a call to pygame. If you want to get really fancy, and make your motion as smooth an as accurate as possible, you can check the value of msElapsed, which will tell you how much time elapsed since the last call to clock.

In theory, it should be close to In practice it might be more or less, depending on the load on your machine.