26.07.2020  Author: admin   Build A Frame
Terri Meeks June 4, at AM. Creating Car Class tyo Java. Place the textures in this folder. The Screen class is where the majority of the calculations are done to get the program working. Now that we know where the ray hits a wall we can start figuring out how the wall should look in the vertical stripe we are currently on. Party Bus Toronto.

At this point, however, your code that modifies the brand etc wouldn't work if setBrand is only defined on Car , not vehicle - because list. You could potentially use:. Fundamentally, you need to decide whether your list should be able to contain any vehicle, How To Build A Toy Wagon Model or only cars. As an aside, I'd strongly recommend that you start following Java naming conventions - use camelCase for your local variables year , brand etc.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. I want to Create Car object using Vehicle class i. Asked 5 years, 10 months ago. Active 5 years, 10 months ago. Viewed 7k times. ArrayList; import java. Improve this question. Jon Skeet 1. Add a comment. Active Oldest Votes. So you could use: list. Improve this answer.

Jon Skeet Jon Skeet 1. Memo: You have a typo - Veichle isn't Vehicle. It looks like your class is currently called Veichle , but you should rename it to Vehicle.

A car is always a vehicle but reverse is not always true. Also IMO the following code is really ugly: list. Place the textures in this folder. You can place the textures somewhere else, this is just where I store my textures. Once this is done we can start writing the code to make the textures usable.

The array pixels is used to hold the data for all the pixels in the image of the texture. Loc is used to indicate to the computer where the image file for the texture can be found. SIZE is how big the texture is on one side a 64x64 image would have size 64 , and all textures will be perfectly square.

The constructor will initialize the loc and SIZE variables and call the a method to load the image data into pixels. It looks like this:. Now all that's left for the Texture class is to add a load method to get data from images and store them in an array of pixel data. This method will look like this:. The load method works by reading the data from the file that loc points to and writing this data to a buffered image.

The data for every pixel is then taken from the buffered image and stored in pixels. At this point the Texture class is done, so I'm going to go ahead and define a few textures that will be used in the final program.

To do this put this. To make these textures accessible to the rest of the program let's go ahead and give them to the Game class. To do this we will need How To Build A Toy Windmill 95 an ArrayList to hold all of the textures, and we will need to add the textures to this ArrayList. To create the ArrayList put the following line of code with the variables near the top of the class:. This ArrayList will have to be initialized in the constructor, and the textures should also be added to it in the constructor.

In the constructor add the following bit of code:. Now let's take another detour and set up the Camera class. The Camera class keeps track of where the player is located in the 2D map, and also takes care of updating the player's position.

Many variables are needed to keep track of the camera's position and what it can see. Because of this the first chunk of the class looks like this:. The vector defined by xPlane and yPlane is always perpendicular to the direction vector, and it points to the farthest edge of the camera's field of view on one side. The farthest edge on the other side is just the negative plane vector.

The combination of the direction vector and the plane vector defines what is in the camera's field of view. The booleans are used to keep track of what keys are being pressed by the user so that the user can move the camera. Next is the constructor. The constructor takes in values that tell the class where the camera is located and what it can see and assigns them to the corresponding variable xPos, yPos A camera object will be needed in the final program, so let's go ahead and add one.

In the Game class with all of the other variable declarations add in. This camera will work with the map I am using, if you are using a different map or if you want to start in a different location adjust the values of xPos and yPos 4 and 6 in my example.

Because the Camera class implements KeyboardListener it must have all the methods from it implemented. Eclipse should automatically prompt you to add these methods. You can leave the keyTyped method blank, but the other two methods will be used. The methods look like this:. Now that the Camera class is keeping track of which keys are pressed we can start updating the player's position. To do this we will use an update method that is called in the run method of the Game class.

While we are at it we'll go ahead and add collision detection to the update method by passing the map to it when it is called in the Game class. The update method looks like this:. The parts How To Build A Toy Wooden Car Music of the method that control forward and backwards movement work by adding xDir and yDir to xPos and yPos, respectively. Before this movement happens the program checks if the movement will put the camera inside a wall, and doesn't go through with the movement if it will.

For rotation both the direction vector and the plane vector are multiplied by the rotation matrix, which is:. With the update method completed we can now call it from the Game class. In the Game class' run method add the following line of code where it is shown here.

The Screen class is where the majority of the calculations are done to get the program working. To work, the class needs the following imports:. The map is the same map created in the game class.

The screen uses this to figure out where walls are and how far away from the player they are. Width and height define the size of the screen, and should always be the same as the width and height of the frame created in the Game class. Textures is a list of all the textures so that the screen can access the pixels of the textures.

After those variables are declared they have to be initialized in the constructor like so:. Now its time to write the one method the class has: an update method. The update method recalculates how the screen should look to the user based on their position in the map.

The method is called constantly, and returns the updated array of pixels to the Game class. The method begins by "clearing" the screen. It does this by setting all of the pixels on the top half to one color and all of the pixels on the bottom to another. Having the top and bottom of the screen be two different colors also makes it seem like there is a floor and a ceiling. After the pixel array is cleared then it is time to move onto the main calculations.

The program loops through every vertical bar on the screen and casts a ray to figure out what wall should be on the screen at that vertical bar. The beginning of the loop looks like this:. All that happens here is some variables that will be used by the rest of the loop are calculated. CameraX is the x-coordinate of the current vertical stripe on the camera plane, and the rayDir variables make a vector for the ray.

All of the variables ending in DistX or DistY are calculated so that the program only checks for collisions at the places where collisions could possibly occur. This will be calculated later. After that is done we need to figure out a few of the other variables based on the one we already calculated.

Once that is done it is time to figure out where the ray collides with a wall. To do this the program goes through a loop where it checks if the ray has come into contact with a wall, and if not moves to the next possible collision point before checking again. Now that we know where the ray hits a wall we can start figuring out how the wall should look in the vertical stripe we are currently on.

To do this we first calculate the distance to the wall, and then use that distance to figure out how tall the wall should appear in the vertical strip. We then translate that height to a start and How To Build A Toy Steam Engine Java finish in terms of the pixels on the screen. The code looks like this:. After that is calculated it is time to begin figuring out what pixels from the texture of the wall will actually appear to the user. For this we first must figure out what texture is associated with the wall we just hit and then figure out the x-coordinate on the texture of the pixels that will appear to the user.

The x-coordinate is calculated by taking the exact position of where the wall was hit on the 2D map and subtracting the integer value, leaving only the decimal. This decimal wallX is then multiplied by the size of the texture of the wall to get the exact x-coordinate on the wall of the pixels we wish to draw.

Once we know that the only thing left to do is calculate the y-coordinates of the pixels on the texture and draw them on the screen. To do this we loop through all of the pixels on the screen in the vertical strip we are doing calculations for and calculate the the exact y-coordinate of the pixel on the texture.

Using this the program then writes the data from the pixel on the texture into the array of pixels on the screen. The program also makes horizontal walls darker than vertical walls here to give a basic lighting effect. And the class is done. Now all we have to do is add a few lines of code in the Game class to get the screen working.

With the variables at the top add this:. Question 7 weeks ago. Question 11 months ago. Does anyone have a hard maze map that I could try for this program? I'm not very good at making mazes, or maps in general. Thank you!



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