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This is the 4th step out of 10 of the Gamedev Making a paddle wheel key tutorial. The ball is bouncing off the walls freely and you making a paddle wheel key watch it indefinitely, but currently there's no interactivity.

It's not a game if you cannot control it! So let's add some user interaction: a controllable paddle. So, we need a paddle to hit the ball. Let's define a few variables for. Add the following variables near the top of your code, beside your other variables:.

Here we're defining the height and width of the paddle and its starting point on the x axis for use in calculations further on down the code. Let's create a function that will draw the paddle on the screen. Add the following just below your drawBall function:. We can draw the paddle wherever we want, but it should respond to the user's actions. It's time to implement some keyboard controls.

We will need the following:. Pressed buttons can be defined and initialized with boolean Making A Paddle Holster variables like in the example. Add these lines somewhere near the rest of your variables:. The default value for both is false because at the beginning the control buttons are not pressed. To listen for key presses, we will set up two event listeners.

Add the following lines just above Making A Paddle Mixer Video the setInterval line at the bottom of your JavaScript:. When the keydown event is fired on any of the keys on your keyboard when they are pressedthe keyDownHandler function will be executed. The same pattern is true for the second listener: keyup events will fire the keyUpHandler function when Making A Paddle Boat Names the keys stop being pressed.

Add these to your code now, below the addEventListener lines:. When we press a key down, this information is stored in a Making A Paddle Wheel Zip Code variable. The relevant variable in each case is set to true. When the key is released, the variable is set back to false. Both functions take an event as a parameter, represented by the e variable. From that you can get making a paddle wheel key information: the key holds the information about the key that was pressed.

If the left cursor is pressed, then the leftPressed variable is set to trueand when it is released, the leftPressed variable is set to false. The same pattern follows with the right cursor and the rightPressed variable.

We've now set up the variables for storing the info about the pressed keys, event listeners, and relevant functions. Next we'll get into the code to use all of the things we just set up and to move the paddle on the screen.

Inside the draw function, we will check if the left or right cursor keys are pressed when each frame is rendered. Our code might look like this:.

If the left cursor is pressed, the paddle will move seven pixels to the left, and if the right cursor is pressed, the making a paddle wheel key will move seven pixels to the right. This currently works, but the paddle disappears off the edge of the canvas if we hold either key for too long. We could improve that and move the paddle only within the boundaries of the canvas by changing the code like this:. The paddleX position we're using will move between 0 on the left side of the canvas and canvas.

Add the above code block into the draw function at the bottom, just above the closing curly brace. The only thing left to do now is call the drawPaddle function from within the draw function, to actually print it on the screen. Add the following line inside your draw function, just below the line that calls drawBall :.

Now we have something resembling a game. The only trouble now is that you can just continue hitting the ball with the paddle forever. This will all change in the fifth chapter, Game overwhen we start to add in an endgame state for our game. We will need the following: Two variables for storing information on whether the left or right control button is pressed.

Two event listeners for keydown and keyup events. We want to run some code to handle the paddle movement when the buttons are pressed. Two functions making a paddle wheel key the keydown and keyup events the code that will be run when the buttons are pressed.

The ability to move the paddle left and right Pressed buttons can be defined and initialized with boolean variables like in the example. Add the following lines just above the setInterval line making a paddle wheel key the bottom of your JavaScript: document. Add making a paddle wheel key following line inside your draw function, just below the line that calls drawBall : drawPaddle.

Here's the making a paddle wheel key code for you to compare yours against: Exercise : Make the paddle move faster or slower, or change its size.

Now click on Loft in the first marker called Features in CommandManager. NB6M paddles. When your Sketch is the same as on the picture, click on Exit Sketch. The DXZone. When your Sketch is the same as mine on the picture, click on Exit Sketch.

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