C++ :: Representing A Rectangle With Only 3 Variables Instead Of 4
Apr 6, 2013
how to use 3 variables to represent a rectangle in a grid instead of using 4. The traditional way is to use (x,y) (x2,y2). I propose using (x,l,h).In the traditional way as you probably know, (x,y) is the left op most corner, and (x2,y2) is the bottom right most corner. In the way I am proposing X is the left side, l is the length of the top side, and also the length of the bottom. 'h' is the height of the left and right. I think it's obvious how these three can define a rectangle same as the four.
Point p1(100,100); Point p2(300,200); Graph_lib::Rectangle r(p1,p2);
And also I have a function that takes a rectangle and returns a Point of that, say, top-left corner of that rectangle. For example:
Point N(Graph_lib::Rectangle R1);
My question is that, first, how to send that Rectangle r(p1,p2) to the Point N(Graph_lib::Rectangle R1) function? And then, how to return a Point from that function?
I'm trying to make a space shooter and I want to make the code very reusable. So far I've been making a bunch of objects with multiple inheritance like this:
entity: anything which can be drawn, has a position and an orientation solid: any entity which can collide with something else mobile: any entity which can move spriteEntity : an entity drawn using a sprite vertexEntity : an entity drawn out of vertexes
The entity class has the virtual method draw, which gets defined by either spriteEntity or vertexEntity. mobile and solid virtually inherit from the entity class.
Then I could create a projectile class which inherits from solid and mobile but adds methods to damage stuff it collides with, and multiple subclasses which inherit from both projectile and spriteEntity... But I'm not sure if it's a good idea to go this deep in multiple inheritance for game objects. I know MI has a bad reputation.
I know that some objects of the game will be sprites and some will be vertexes, and I also know there will be stuff which collides and doesn't move... Or should I make the mobile class a subtype of solid?
We are supposed to create a point structure that can be used to represent a point in the xy-plane. Then, write a menu-driven C++ program that uses variables of type point to perform a variety of tasks involving points in the xy plane, including slope, distance, midpoint, equation of a line passing through points, and colinearity. One of the functions we are to create is simply for reading in the user-input in the following form "(x,y)" with the user entering the parentheses and comma. We are to create two functions that translate back and forth between this format and what the assignment calls "one point variable."
I'm confused how I'm supposed to take the user entering, say "(1,4)" and reading that into an x and y, and then comparing it against another set of points. I'm guessing I read them in as a, b, c, d, but I'm not sure what this has to do with a structure.
Create a class representing project activities. In this class include all the required data members and member functions. Each activity should have a record of activity duration, calculated early start, early finish, late start, late finish, free float, and total float. Each activity may or may not maintain a list of its successors and predecessors. Provide your design in UML and implement it in C++ using an interface head file and an implementation source file. I do not understand classes or UML designs.
I have been working on some C++ code that doesn't seem to be going right. I'm wanting it to read a (three-digit) integer representing the value to be encrypted, a (one-digit) integer representing the encryption key, encrypt the value and print the encrypted value. The encrypting method used is that each digit in the given number is replaced by ((the sum of that digit plus key) modulo 10) then the first and last “encrypted” digits are swapped.
For example, if the number entered was 216 and the key given was 7, after applying the encryption procedure described the first digit (2) would become 9, the middle digit (1) would become 8 and the last digit (6) would become 3. The first and last encrypted digits are then swapped. The program displays the encrypted number: that is 389 in this case.
#include <iostream> using namespace std; int main() { int isolateDigits(); int replaceDigits(); int swapDigit1withDigit3();
I have two random numbers which are generated and are related to each other (representing x and y co-ordinate). These random numbers are generated within a specified range: (-range, +range).
I want to categorize these values in a (2-dimensional) grid. The grid size is not definite and so can be varied by the user would be in the order of 400 x 400. (e.g., think CCD detector). For each random number pair (x, y) I want to store a hit (a plus one) in the corresponding grid reference.
In the order of 500,000 related random numbers (x and y) are to be generated and the position recorded according to grid reference. So code needs to be fast.
the code draws rectangle or square it depends on you (column,row) then, put number in the center of the rectangle i don't want to extra space after putting one,two,three or four digits number in the center of the rectangle
I'm trying to make a program that prints a rectangle using "*" asterisks. I am only allowed to use "for loops" and I simply cannot get this to work properly. Here is my code so far...
Code: int main(void) { //RectangleSize represents the area of the rectangle(width*length) int length, width, RectangleSize;
I have having trouble looping through the list in the update section to update each object in the rectangleList. I am not sure how to format it because it is only drawing one and it does not move across the screen. I thought this section of code would work and loop through each object and make each one move but it does not.
for (int i = 0; i < rectangleList.Count; i++) { enemyPosition = new Rectangle(rectangleList[i].X + 2, rectangleList[i].Y ,enemyPosition.Width,enemyPosition.Height); } List<Rectangle> rectangleList; protected override void Initialize() { rectangleList = new List<Rectangle>();
I am making a game Pong, and have been struggling with the collision aspect between the baal hitting off the paddle. I have created a Class, to draw a rectangle, to work with collision however I dont know how to assign the rectangle to the images of the ball and paddle.
I am new to C and am unfortunately racking my brain against this simple assignment. I believe the task is to produce a rectangle out of asterisks using while loops, yet I can only produce an "L" shape. We were given a code, with syntax errors included.We are to correct the errors and test.
Code:
#include <stdio.h> /*Houghton, Micah*/ /*ET2560 - Cordova*/ /*Unit 5 Lab - Programming Loops*/ int main(void) { int length, width; int lcount, wcount;
#include <iostream> #include <cmath> using namespace std;
//prototypes for all separate functions int chooseFunc(int); int chooseMethod(int); int numRect(int);
[Code] .....
It seems that my program will ask the user for the number of rectangles and trapezoids but will fail to compute the area under the curve from the user input. Therefore, I believe I have a logical error somewhere or I'm forgetting to call something somewhere.
[URL] .... This is what I have so far, and it isn't incorrect, but how to improve this or make it more accurate?
// subtracting the area of two circles from a rectangle #include <iostream> using namespace std; int main() { cout << "This program is designed to calculate the area of a rectangle, to exclude the area of 2 circles that have been placed inside of the rectangle." << endl << endl;
Define functions n(), s(), e(), w(), center(), ne(), se(), sw() and nw(). Each takes a Rectangle argument and returns a Point. These functions define connection points on and in the rectangle. For example, nw® is the northwest (top-left corner) of a rectangle called r.
I wrote below code for that:
#include <Simple_window.h> Point n(const Graph_lib::Rectangle& r); Point s(const Graph_lib::Rectangle& r); Point e(const Graph_lib::Rectangle& r); Point w(const Graph_lib::Rectangle& r); Point ne(const Graph_lib::Rectangle& r); Point se(const Graph_lib::Rectangle& r);
[Code]...
As you see, this just mark the top-left corner of the rectangle r. In other functions I need the specifications of that rectangle, for example its height and width. How to use these specs in those functions?
I've been given the task of converting a java application to a c# windows form application. The program displays a Mandelbrot which then allows the user to zoom into. I've managed to display the Mandelbrot and even zoom. However when dragging a box to zoom, the box its self doesn't show, meaning the user cannot see what area they will be zooming into.
I believe I need to call the update function which draws the rectangle as I drag however no matter what I try, I get errors from a red cross instead of the Mandelbrot to compile errors. Here is the code that I believe is relevant.
public void update(Graphics g) { Color color = Color.White; Pen myPen = new Pen(color); g.DrawImage(myBitmap, 0, 0); if (rectangle) {
Write a program that prompts the user to input the length of a rectangle and the width of a rectangle and then displays the rectangle's area and perimeter. The program should be broken down in 3 parts:
1. Input the length and the width (two input statements)
2. Calculate the area & perimeter (results should be saved in variables
3. print results.
Format the output so the user can easily read the results. Use the tab escape so its easy to read. --------------------------------------------------------------- So here's what I have so far. I have been stuck for two days
#include iostream using namespace std; int main () { int double length; int width; int area; int perimeter;
[Code] ....
I dont want to get a zero for not turning this in...
I am writing a program to calculate a rectangle's area.
Eg. Enter top left point: 1 1 (User input) Enter bottom right point: 2 -1 (User input) Top Left x = 1.000000 y: 1.000000 Bottom Right x = 2.000000 y: -1.000000 Area = 2.000000 (Program output)
It keeps on prompting me my variable r is being used without being initialized, when I think I already did so.
