How to make a game in idle python
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</div><p style="text-align:justify"><img class="alignright size-thumbnail wp-image-36742" src="https://www.electronicsforu.com/wp-contents/uploads/2017/06/saninew-150x150.jpg" alt="" width="150" height="150" srcset="https://www.electronicsforu.com/wp-contents/uploads/2017/06/saninew-150x150.jpg 150w,
https://www.electronicsforu.com/wp-contents/uploads/2017/06/saninew.jpg 308w" sizes="(max-width: 150px) 100vw, 150px">Have you ever wondered how video games are created? It is not as complicated as you might think. Presented here is a simple game called Bunnies and Moles, where the hero, the bunny, has to defend a castle against a horde of moles. We built this game using Python.</p> <p style="text-align:justify">It is a popular embedded programming language
used in Arduino, Raspberry Pi and others. This article aims to familiarise beginners with some Python libraries that can be implemented in embedded projects as well. Python is simple to start out with, fun and easy to learn.</p> <h2 style="text-align:justify">Installing Python</h2> <p style="text-align:justify">To try this tutorial on a Windows PC, install Python 2.7.3 version (not 3.3.0). Run the installer, and you will get IDLE in All
Programs folder in Start menu. Launch IDLE.</p> <p style="text-align:justify">If you are using a Mac, you will already have Python installed. Open Terminal; once at Python prompt, to test if it is correctly working, type ‘print 1+1’ and hit Return. It should print 2. You have just written your first Python program!</p><div class="td-a-rec td-a-rec-id-content_inline tdi_2 td_block_template_1"> <style> /* custom css */
.tdi_2.td-a-rec{ text-align: center; }.tdi_2 .td-element-style{ z-index: -1; }.tdi_2.td-a-rec-img{ text-align: left; }.tdi_2.td-a-rec-img img{ margin: 0 auto 0 0; }
@media (max-width: 767px) { .tdi_2.td-a-rec-img { text-align: center; } } </style> <div id="div-gpt-ad-1522664648011-0"> <script> googletag.cmd.push(function() { googletag.display('div-gpt-ad-1522664648011-0'); }); Add the following code to game.py at the beginning of draw the screen section #6 (before the player is drawn on the screen): for x in range(width/grass.get_ As you can see, the ‘for’ statement loops through x first. Then, within that loop, it loops through y and draws the grass at x and y values generated by ‘for’ loop. The next couple of lines draw castles on the screen. If you run the program now, you would get something like shown in Fig. 2. Make the bunny moveNext, add some actual gameplay elements, like making the bunny respond to key presses. To do that, implement a method of keeping track of which keys are being pressed at any given moment. You can do this simply by making an array of key states that hold the state of each key you want to use for the game. Add the following code to game.py at the end of initialise the game section #2 (after you set the screen height and width): keys = [False, False, False, False] This code is self-explanatory. The keys array keeps track of the keys being pressed in the following order: WASD. Each item in the array corresponds to one key with particular action—first to W for up, second to A for left, S for down and D for right movement. Playerpos variable is where the program draws the player (bunny). You now need to modify the existing code for drawing the player to use the new playerpos variable. Change the following lines in draw the screen section: screen.blit(player,
(100,100)) Update the keys array based on the keys being pressed. PyGame makes key press detection easy by adding event.key functions. At the end of loop through event section #8, right after the block checking for event, type pygame.QUIT. Put the following code at the same indentation level as pygame.QUIT block: if event.type == pygame.KEYDOWN: Check to see if a key is being pressed down or released. If the key being pressed or released is one of the keys you are using, update the keys variable accordingly. Finally, update playerpos variable in response to the key being pressed. This is quite simple. Add the following code to the end of game.py (with one indentation level, putting it at the same level as ‘for’ loop): # 9 – Move player This code checks which keys are being pressed, and adds or subtracts from the player’s x or y position (depending on the key pressed) to move the player. Run the game and you would get a player just like before. Press WASD. Yay! It works. Turn bunny with mouseYour bunny can now move (up, down, left and right) when you press appropriate keys on the keyboard. But can you use the mouse to rotate the bunny to face the direction of your choice? It is simple to implement this using trigonometry. Take a look at the illustration in Fig. 3. In the above image, if (5,3) is the position of the bunny and (2,4) is the current position of the mouse, you can find the rotation angle (z) by applying atan2 trigonometric function to the difference in distances between the two points. Of course, once you know the rotation angle, you can simply rotate the bunny accordingly. You use this stuff all the time in game programming. To do this, use PyGame Surface.rotate(degrees) function. Keep in mind that z value is in radians. The atan2 function comes from Python Maths library. Add this library to the import library section #1 first. Replace the last line in draw the screen element section #6 (player.blit line) with the following code: # 6.1 – Set player position and rotation In the above code, first, get mouse and player positions and feed those into atan2 function. Then, convert the angle received from atan2 function from radians to degrees (multiply radians by approximately 57.29 or 360/2p). Since the bunny will be rotated, its position will change. Calculate the new bunny position and display the bunny on the screen. Run the game again. If you use just WASD keys, then the game would behave exactly like before. But if you move your mouse, the bunny rotates, too. Shoot, bunny, shoot!Now that your bunny’s moving around, it is time to add a little more action. How about letting the bunny shoot enemies using arrows? This step is a bit more complicated because you have to keep track of all arrows, update, rotate and delete these when these go off screen. Add the necessary variables to the end of initialisation section, section #2: acc=[0,0] The first variable keeps track of the player’s accuracy and the second tracks all arrows. The accuracy variable is essentially a list of the number of shots fired and the number of moles hit. Later, we use this information to calculate an accuracy percentage. Load the arrow image at the end of section #3 using the following: arrow = pygame.image.load (“resources/ When a user clicks the mouse, an arrow should fire. Add the following to the end of section #8 as a new event handler: if event.type==pygame.MOUSEBUTTONDOWN: position=pygame.mouse.get_pos() This code checks if the mouse was clicked, and if it was, it gets the mouse’s position and calculates arrow rotation based on the rotated player position and the cursor position. This rotation value is stored in arrows array. Draw arrows on screen. Add the following code right after section #6.1: # 6.2 – Draw arrows The vely and velx values are calculated using basic trigonometry. Ten is the speed of the arrows. The ‘if’ statement checks if the bullet is out of bounds and, if so, deletes the arrow. The second ‘for’ statement loops through the arrows and draws these with the correct rotation. Run the program; you would have a bunny that shoots arrow (Fig. 4) when you click the mouse. Take up arms, moles!You have a castle and a hero who can move and shoot. So what is missing? Enemies who attack the castle that the hero can shoot at! In this step, you will create randomly-generated moles that run at the castle. There will be more moles as the game progresses. So let us see what you will need to do so. Add bad guys to a list of array. Update the bad guy array frame, show the bad guys on the screen. badtimer=100 This sets up a timer (as well as a few other values) so that the game adds new moles after some time has elapsed. Decrease all badtimer frames until these reach zero to release a new mole. Add the following to the end of section #3: badguyimg1 = pygame.image. The first line above is similar to all the previous image-loading codes. The second line sets up a copy of the image so that you can animate the bad guy much more easily. Update and show the bad guys. Add the code given below after section #6.2: # 6.3 – Draw moles The first line checks if badtimer is zero, and if it is, creates a mole and sets up badtimer again based on the number of times badtimer has run so far. The first ‘for’ loop updates x position of the moles, checks if moles are off screen and removes these if so. The second ‘for’ loop draws all moles. In order to use the random function in the above code, import the random library. Add the following code to the end of section #1: import random Add the following after the while statement (section #4) to decrement the value of badtimer for each frame: badtimer-=1 Run the program. Now you would start seeing some real gameplay—you can let the bunny shoot, move and turn, while the moles try to run towards him (Fig. 5). But wait! Why are the moles not blowing up the castle? Add the code given below before index+=1 on the first for loop in section #6.3: # 6.3.1 – Attack castle The first line checks if badtimer is zero, and if it is, creates a mole and sets up badtimer again based on the number of times badtimer has run so far. The first ‘for’ loop updates x position of the moles, checks if moles are off screen and removes these if so. The second ‘for’ loop draws all moles. In order to use the random function in the above code, import the random library. Add the following code to the end of section #1: import random Add the following after the while statement (section #4) to decrement the value of badtimer for each frame: badtimer-=1 Run the program. Now you would start seeing some real gameplay—you can let the bunny shoot, move and turn, while the moles try to run towards him (Fig. 5). But wait! Why are the moles not blowing up the castle? Add the code given below before index+=1 on the first for loop in section #6.3: # 6.3 – Draw moles If the moles’s x value is less than 64 to the right, then delete that bad guy and decrease the game health value by a random value between 5 and 20. If you build and run the program, you would get a bunch of attacking moles who vanish when they hit the castle. Although you cannot see it, the moles are actually lowering your health. Collisions with moles and arrowsThe moles are attacking your castle. It is time to set the arrows to kill the moles so you can safeguard your castle and win the game. Basically, loop through all the bad guys and inside each of those loops, loop through all the arrows and check if these collide. If they do, then delete the moles and the arrow, and add one to your accuracy ratio. Right after section #6.3.1, add the following: #6.3.2 – Check for collisions If you run the program, you should finally be able to shoot and kill the moles. Add a HUD with health meter and clockNow all you need is a way to keep score and to show how well the bunny is doing. The easiest way to do this is to add a heads-up display (HUD) that shows the current health level of the castle. You can also add a clock to show how long the castle survived. Add the clock and add the following code right before the beginning of section #7: # 6.4 – Draw clock Next, add the health bar. But before drawing that, load the images for the bar. Add the following code to the end of section #3: healthbar = pygame.image.load The first is the red image used for the full health bar. The second is the green image used to show the current health level. Add the following code right after section #6.4 (that you just added) to draw the health bar on the screen: # 6.5 – Draw health bar The code first draws the all-red health bar. Then, it draws a certain amount of green over the bar, according to how much life the castle has remaining. If you build and run the program, you would have a timer and a health bar. Win or loseYou need some sort of a win or lose scenario to make the game worth playing. Do this by exiting out of the main loop and going into a win or lose loop. In this loop, figure out if the user won or lost, and display that on the screen accordingly. Add the following lines to the end of game.py: #10 – Win/Lose check The first ‘if’ statement checks if the time is up. The second checks if the castle is destroyed. The third calculates the accuracy ratio. After that, a quick ‘if’ statement checks if you won or lost, and displays the correct image. NoteThe acc[0]*1.0 is just converting acc[0] to a float. If you do not do this, the division operand will return an integer like 1 or 2 instead of a float like 1.5. If you want to display images for the win and lose screens, then those images have to be loaded first. To do so, add the following code to the end of section #3: gameover = pygame.image.load(“resources/ Change section #4 to: # 4 – keep looping through The running variable checks if the game is over and the exit code variable tells whether the player won or lost. Gratuitous music and sound effects. PyGame makes loading and playing sounds simple. First, initialise the mixer by adding the following at the end of section #2: pygame.mixer.init() Then, load the sounds and set the volume level at the end of section #3. # 3.1 – Load audio Most of the above code is simply loading audio files and configuring audio volume levels. But, pay attention to pygame.mixer.music.load line. It loads background music for the game and the next line sets the background music to repeat forever. This takes care of the audio configuration. Play various sound effects as needed. Do that as per the directions in the comments for the code given below: # section 6.3.1 after if badrect. You now have background music and sound effects for collisions and shooting, and the game is much more alive. Where to go from hereYou have just finished creating a fun game packed with music, sound effects, a killer bunny, kamikaze moles and more. At this point, feel free to modify this game. May be, replace the art with your own drawings, or add different weapons or types of monsters into the game. Testing the gameBefore running the game, install library file pygame-1.9.1.win32-py2.7. Make sure the resource files and game.py are in same folder. Then, click on game.py file and the game will automatically start. Use your mouse to shoot ithe moles. Download source codeFeel interested? Check out other software projects. This article was first published on 13 December 2016 and was updated on 22 August 2019.How do you create a game in Python?Python provides a built-in library called pygame, which used to develop the game. Once we understand the basic concepts of Python programming, we can use the pygame library to make games with attractive graphics, suitable animation, and sound. Pygame is a cross-platform library that is used to design video games.
Can you code a game in Python?You can write whole games in Python using PyGame. See a list of other PythonGameLibraries maintained in this Wiki, or this list maintained on DevMaster.net. A full tutorial can be found in the free book "Making Games with Python & Pygame".
How do I run a Python game?Ubuntu/Linux. Open a terminal. (Gnome: Applications->Accessories->Terminal. ... . Navigate to the folder where the Python program you want to run is located. By default IDLE saves in your home folder, so if you use that you don't actually have to do anything.. Type 'python [program name]. py' and press enter to run the program.. |
