Is there any way I can do that? Pygame's draw module allows for other shapes to be drawn as well. In the code above, you may fill in color and radius with your desired values. Learn more. Pygame simple bouncing animation Ask Question.
Asked 6 years, 5 months ago. Active 1 year, 3 months ago. Viewed 12k times. I have this program from a pygame tutorial: import sys, pygame pygame. QUIT: sys.In tftpd
Joker Joker 1 1 1 gold badge 1 1 silver badge 1 1 bronze badge. Active Oldest Votes. You just have to replace screen.In this activity we will explore how to use Python to solve the equations of motion for a ball thrown off of a ledge.
You should have some experience with Python syntax at this point, but feel free to use Googlethe Python documentationor the Codecademy glossary to refresh your memory. For those with a lot of Python experience, there are some challenges at the end of the activity that should be more than enough to do.
To download the file, either click it or right click it and select Save Link As. This should download the program with the. Open up the file by double clicking it.
The Canopy Python environment should open up and you should see the code in the Editor window. Here's what you should see if you sucessfully downloaded and opened the file. The entry point for the program is the evolve function. With these initial conditions, it sets the initial position and velocity of the ball in two dimensionssets up the plotting environment, and starts the main loop that advances the ball forward in time.
What is the acceleration in the x and y directions?
Hit the Run button in the toolbar above the editor. This will run the code in the editor window and allow you to access all of the functions in the Python terminal. Now call the evolve function with the arguments evolve 5, 15, 10, 30, 0. What do these arguments represent?
The problem with our simple update algorithm from above is that it does not conserve energy. We would like to create an update scheme that conserves the ball's energy at all times. To do this we can use what is called a drift-kick-drift DKD scheme also called the Leapfrog method or the Velocity-Verlet method. The algorithm is split up into three steps.
Don't forget to update the time and return the new positions and velocities! Now evolve the system by calling the evolve function with the same input values as before, evolve 5, 15, 10, 30, 0.
Look at the energy plot as the ball bounces. Have we fixed the problem of energy conservation? Your final plot should look like this.
Run the evolve function for five different combinations of initial speed and direction. Save the final images using the save button on the plotting window the "floppy disk" image. When a real ball bounces, it deforms slightly. When it deforms it heats up due to friction and the energy that went into the heat is lost forever. This suggests that the kinetic energy in the ball before it bounces is greater than the kinetic energy in the ball after it bounces.
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We can parametrize this with the coefficient of restitution. This coefficient is a number between 0 and 1 that relates the y-velocity of the ball before it bounces to the y-velocity of the ball after it bounces.
A coefficient of restitution equal to 1 implies that the ball is perfectly elastic and that there is no deformation of the ball as it bounces. Define a new variable that holds the value of the coefficient of restitution and modify the new y-velocity that the ball has after the bounce to include the effect of deformation discussed above.
Hopefully by the end of this activity you have a better idea about how to solve the equations of motion of an object numerically using Python. The basic idea was to take small steps in time and then change the objects position and velocity by using their definitions as rate of change quantities i.User forum. This is documentation for Classic VPython VPython 6which continues to be available but is no longer supported.
See vpython. Documentation is available at glowscript. Here is a complete VPython program that produces a 3D animation of a red ball bouncing on a blue floor as shown above. Note that in the "while" loop there are no graphics commands, just computations to update the position of the ball and check whether it hits the floor. The 3D animation is a side effect of these computations. The program starts by importing the module "visual" which enables 3D graphics.
A box and a sphere are created and given names "floor" and "ball" so one can refer to these objects. The ball is given a vector velocity.
In the while loop, "rate " has the effect "no more than loops per second on fast computers. The ball's velocity is used to update its position, in a single vector statement that updates x, y, and z. Visual periodically use the current values of the objects' attributes, including ball. The program checks for the ball touching the floor and if necessary reverses the y-component of velocity, otherwise the velocity is updated due to the gravitational force.
It is a simple bouncing ball. What I want is to replace the ball ball. I mean, the only thing I want to change is the ball by replacing it with a circle and animate that circle with the same code I used to animate the ball. Is there any way I can do that? Pygame's draw module allows for other shapes to be drawn as well. In the code above, you may fill in color and radius with your desired values. Learn more. Pygame simple bouncing animation Ask Question. Asked 6 years, 6 months ago.
Active 1 year, 3 months ago. Viewed 12k times. I have this program from a pygame tutorial: import sys, pygame pygame.
QUIT: sys. Joker Joker 1 1 1 gold badge 1 1 silver badge 1 1 bronze badge. Active Oldest Votes. You just have to replace screen. But if I do that, it means that it uses the rectangular area of the image. And, for example, if the circle diameter is smaller or bigger than the length of the rectangle "ballrect", the circle will not bounce exactly when it hits the margins of the screen. In order to do that, I will have to use an image the same size of the circle Is there a way that I can use only the circle without having to use an image?
Code Golf Stack Exchange is a question and answer site for programming puzzle enthusiasts and code golfers. It only takes a minute to sign up. The resulting curve is slightly different than the example, but this is because the velocity is adjusted before the ball goes into the floor, instead of after it already has. I'll submit my own solution in Python.
Only slightly simplified; I'm sure there are much better ways of doing it! The example output in the question post was generated using this program. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.
Bouncing ball simulation Ask Question. Asked 7 years, 2 months ago. Active 6 years, 11 months ago. Viewed 2k times. The following assumptions are made: The ball starts at the top left corner: 0, 0 with zero initial velocity. Gravity is 9. The ball weighs g exactly. The ball bounces at 45 or degrees to the floor unless you want to add the appropriate calculations to add variable trajectories.
Bonus arbitrary points! The ball is perfectly spherical and does not deform when it bounces. The room is 25 characters high, characters wide. Each x and y is 1 metre and each ball position represents a discrete sample -- the exact time period is deliberately unspecified, but the display should make the ball's path sufficiently clear.
The output should show the path of the ball, not just the final position. The presence of no ball or floor surface shall be indicated with a space character. You are allowed to assume rounding to three decimal places in any calculations. Solutions using purely integers may be particularly interested in this rule. The program must simulate the ball's path, not simply load it from a file or have it encoded somehow in the program.
The test for this will be to optionally change one of the constants. If the program does not calculate a new, correct result, then it does not qualify. I will accept the answer which: Meets the rules as defined above. Bonus featureness will be considered. Is the shortest and most elegant subjective decision.
Thomas O. Thomas O Thomas O 3, 20 20 silver badges 33 33 bronze badges.
As I see it now I could just draw the box and say the ball is stationary, or gzip your image and display it on every run.
I think problems should always have some sort of an input user, random, etc. If they mark the ball's path, this physics simulations seems a little dubious because the ball has no motion component to the right, so when bouncing on a flat floor, it should bounce back straight up and not to the right.For example, you could write your own simulator for celestial bodies, and use that simulator to explore the motion of the solar system, as well as of the earth and moon.
I would like to write a program to make a ball bounce on the screen under the influence of gravity. Before we get to the program, a note about physics definitions. Velocity and speed are not the same. Velocity combines speed with a direction. Our program will keep track of the velocitywhich we decompose into horizontal x and vertical y components. Because you have already written the pong game in Lab Assignment 1, you should be able to understand quite easily the code to make the ball bounce off the floor and ceiling.
In the last example, we drew frames at a rate of 20 frames per second.English to owo translator
But my computer is fast enough to easily draw 60 frames per second. This was a problem in early PC computer games: the game would draw as many frames as possible per second on the computer the game was written on. Then a faster computer would come out, and the evil ghosts would run far too fast. We call this amount the timestep. The simplest way to get an approximate value for the timestep is to divide 1 by the frame rate. Making sure, of course, that we do floating division, not integer division.
Position is in pixels, velocity is in pixels per second, and the timestep is in seconds. The units for the expression work out to.
What is acceleration? Think of it this way. That means in each second, the velocity will increase by 1 meter per second, so that the increase in velocity is 1 meter per second, per second; or 1 meter per second squared. And so on. As the ball accelerates, the change in its position from the beginning to the end of each timestep increases. We can solve the second issue by changing all coordinates in the program to be measured in meters. The floor will be 4 meters from the bottom of the screen.
The ball starts at timestep 0so its initial y -coordinate is y 0. If the ball moves at constant velocity v ythen its position after timestep t is. What if the velocity is not constant? Imagine that the ball starts at velocity 0, but it is accelerating downward. For a ball with velocity v ywith a constant acceleration a yand timestep t. You might wonder whether it makes much difference whether we update the position before or after we update the velocity.
Here, the answer is no. If you can notice the difference in how the program behaves, you have a keener eye than me. With larger distances and long time scales, gravitational accelerations are not constant.
Simulation of a Bouncing Ball
Steps 1 and 3 we have already seen how to do in the previous example.Christian Thompson has a YouTube channel where he clearly explains how to write neat little game-like programs in Python. He just uploaded a four-part series on how to simulate bouncing balls. Circuitmess's fully funded Makerphone kickstarter is raising money to produce open source hardware smartphone kits to teach kids and grownups everything from soldering to programming.
Here he shows how and why a clutch of python eggs can be lifted up in giant sticky clumps. In baseball, utility players often stay employed almost exclusively because of their versatility, their ability to slide effortlessly into a variety of needed roles and remain productive.
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Who will be eaten first? Our forum rules are detailed in the Community Guidelines. Boing Boing is published under a Creative Commons license except where otherwise noted. Jason Weisberger Publisher. Ken Snider Sysadmin. Kickstarting the Makerphone: an open-source hardware phone kit, programmable with python and Scratch Circuitmess's fully funded Makerphone kickstarter is raising money to produce open source hardware smartphone kits to teach kids and grownups everything from soldering to programming.Force emui 10 update
Turns out that python eggs stick to each other for a bunch of good reasons YouTuber Retic over at Prehistoric Pets TV has a huge collection of pythons and other ancient creatures. Python is the simplicity developers love.2020 09 1en olx chennai
This training will help you harness its power. The Mountie Plus turns your tablet into a sneaky second laptop screen In baseball, utility players often stay employed almost exclusively because of their versatility, their ability to slide effortlessly into a variety of needed roles and remain productive.
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