Hello I am trying to make a paint program using XNA and I followed the guide found in here as much as possible: How to create Paint-like app with XNA? And it worked all great so far however there is one issue: the drawn rectangles dont connect together to form a line. I am out of ideas and I would appreciate any help offered. Heres my code below. Please also take a look at the image attached to get a better understanding.
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using System;
using System.Collections.Generic;
namespace ProfAnas
{
/// <summary>
/// This is the main type for your game.
/// </summary>
public class Game1 : Game
{
GraphicsDeviceManager graphics;
SpriteBatch spriteBatch;
Texture2D canvas;
Vector2 brushPos;
public Game1()
{
graphics = new GraphicsDeviceManager(this);
Content.RootDirectory = "Content";
graphics.PreferredBackBufferWidth = 1920; // set this value to the desired width of your window
graphics.PreferredBackBufferHeight = 1080; // set this value to the desired height of your window
graphics.ApplyChanges();
}
/// <summary>
/// Allows the game to perform any initialization it needs to before starting to run.
/// This is where it can query for any required services and load any non-graphic
/// related content. Calling base.Initialize will enumerate through any components
/// and initialize them as well.
/// </summary>
protected override void Initialize()
{
// TODO: Add your initialization logic here
base.Initialize();
Color[] pixel = new Color[1920 * 1080];
for (int i = 0; i < pixel.Length; i++)
{
pixel[i] = Color.White;
}
pixel[1919] = Color.Red;
spriteBatch = new SpriteBatch(GraphicsDevice);
canvas = new Texture2D(this.GraphicsDevice, 1920, 1080);
canvas.SetData<Color>(pixel);
}
/// <summary>
/// LoadContent will be called once per game and is the place to load
/// all of your content.
/// </summary>
protected override void LoadContent()
{
// Create a new SpriteBatch, which can be used to draw textures.
spriteBatch = new SpriteBatch(GraphicsDevice);
// TODO: use this.Content to load your game content here
}
/// <summary>
/// UnloadContent will be called once per game and is the place to unload
/// game-specific content.
/// </summary>
protected override void UnloadContent()
{
// TODO: Unload any non ContentManager content here
}
/// <summary>
/// Allows the game to run logic such as updating the world,
/// checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{
MouseState state = Mouse.GetState();
Color[] pixel = new Color[1920 * 1080];
canvas.GetData<Color>(pixel);
if (state.LeftButton == ButtonState.Pressed)
{
brushPos.X = state.X;
brushPos.Y = state.Y;
double piOn4 = Math.PI / 4;
int xComponent;
int yComponent;
int screenWidth = 1920;
int screenHeight = 1080;
int regionXHalfed = (int)Math.Ceiling((10.0 * Math.Cos(piOn4) + 30.0 * Math.Cos(piOn4))/2);
int regionYHalfed = (int)Math.Ceiling((10.0 * Math.Sin(piOn4) + 30.0 * Math.Sin(piOn4))/2);
double angle;
double centerToBoundary;
double pixelToCenter;
List<int> boundedPixel = new List<int>();
for (int row=(state.Y-regionYHalfed); row < (state.Y + regionYHalfed); row++)
{
for (int column= (state.X - regionXHalfed); column < (state.X + regionXHalfed); column++)
{
xComponent=column - state.X+1;
yComponent=row - state.Y+1;
if (xComponent == 0)
{
pixelToCenter = Math.Sqrt((double)xComponent*xComponent + (double)yComponent*yComponent);
if (Math.Abs(pixelToCenter) <= 5*Math.Sqrt(2))
{
boundedPixel.Add(((row) * screenWidth + column) + 1);
}
continue;
}
angle=Math.Atan( (double)yComponent / (double)xComponent);
if (angle>= (piOn4 - Math.Atan(1.0/3)) && angle<= (piOn4 + Math.Atan(1.0/3)))
{
centerToBoundary = 15 / Math.Cos(angle - piOn4);
pixelToCenter= xComponent / Math.Cos(angle);
if( Math.Abs(pixelToCenter) <= Math.Abs(centerToBoundary))
{
boundedPixel.Add(((row)* screenWidth + column)+1);
}
}
if (angle >= (piOn4 + Math.Atan(1.0 / 3)) && angle <= Math.PI/2)
{
centerToBoundary = 5 / Math.Cos(angle + piOn4);
pixelToCenter = xComponent / Math.Cos(angle);
if (Math.Abs(pixelToCenter) <= Math.Abs(centerToBoundary))
{
boundedPixel.Add(((row) * screenWidth + column) + 1);
}
}
if (angle >= 0.0 && angle <= (piOn4 - Math.Atan(1.0 / 3)))
{
centerToBoundary = 5 / Math.Cos(angle + piOn4);
pixelToCenter = xComponent / Math.Cos(angle);
if (Math.Abs(pixelToCenter) <= Math.Abs(centerToBoundary))
{
boundedPixel.Add(((row) * screenWidth + column) + 1);
}
}
if (angle >= -Math.PI / 2 && angle <= 0.0)
{
centerToBoundary = 5 / Math.Cos(angle + piOn4);
pixelToCenter = xComponent / Math.Cos(angle);
if (Math.Abs(pixelToCenter) <= Math.Abs(centerToBoundary))
{
boundedPixel.Add(((row) * screenWidth + column) + 1);
}
}
}
}
foreach (int i in boundedPixel)
{
if(i>=0)
pixel[i] = Color.Red;
}
}
canvas.SetData<Color>(pixel);
// TODO: Add your update logic here
base.Update(gameTime);
}
/// <summary>
/// This is called when the game should draw itself.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
// TODO: Add your drawing code here
spriteBatch.Begin();
spriteBatch.Draw(canvas, new Vector2(0, 0));
spriteBatch.End();
base.Draw(gameTime);
}
}
}
Thank you :)
