Odtnhj

I'am trying to Draw a Triangle in through three points, with known coordinates enclosed within the Triangle.

I wrote this algorithm to do all this, but the code is slow.

Can anyone give me another easy and faster way to draw a Triangle?

I have got the algorithm of drawing the line from this site but do not mention the post sorry.

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

public partial class Form1 : Form

 int Screen_height;
 int Screen_width;

 List<int> Pointsx = new List<int>(new int );
 List<int> Pointsy = new List<int>(new int );

 List<int> edge_one_Tranglex= new List<int>(new int );
 List<int> edge_one_Trangley = new List<int>(new int );

 List<int> edge_two_Tranglex = new List<int>(new int );
 List<int> edge_two_Trangley = new List<int>(new int );

 List<int> edge_three_Tranglex = new List<int>(new int );
 List<int> edge_three_Trangley = new List<int>(new int );

 int edge = 1;
 Bitmap bmp;

 int start = 0;
 int center_x;
 int center_y;

 public Form1()
 
 InitializeComponent();
 

 private void Form1_Load(object sender, EventArgs e)
 
 Screen_height = panel1.Height;
 Screen_width = panel1.Width;
 Console.WriteLine(" " + Screen_height + "," + Screen_width);
 

 private void panel1_Paint(object sender, PaintEventArgs e)
 
 if (start == 0)
 
 var sw = new Stopwatch();
 sw.Start();
 bmp = new Bitmap(panel1.Width, panel1.Height);
 panel1.BackgroundImage = (Image)bmp;
 panel1.BackgroundImageLayout = ImageLayout.None;

 //from x to x2 and from y to y2
 //D_line(100, 10, -100, 20);
 D_Triangle(-300, 10, 100, 20, 100, -100);

 sw.Stop();
 Console.WriteLine("" + sw.Elapsed);
 start += 1;
 
 

 public void D_line(int x, int y, int x2, int y2)
 
 center_x = Screen_width / 2;
 center_y = Screen_height / 2;
 line(center_x + x, center_y - y, center_x + x2, center_y - y2);
 

 public void line(int x, int y, int x2, int y2)
 
 int w = x2 - x;
 int h = y2 - y;
 int dx1 = 0, dy1 = 0, dx2 = 0, dy2 = 0;
 if (w < 0) dx1 = -1; else if (w > 0) dx1 = 1;
 if (h < 0) dy1 = -1; else if (h > 0) dy1 = 1;
 if (w < 0) dx2 = -1; else if (w > 0) dx2 = 1;
 int longest = Math.Abs(w);
 int shortest = Math.Abs(h);

 if (!(longest > shortest))
 
 longest = Math.Abs(h);
 shortest = Math.Abs(w);
 if (h < 0) dy2 = -1; else if (h > 0) dy2 = 1;
 dx2 = 0;
 

 int numerator = longest >> 1;
 for (int i = 0; i <= longest; i++)
 
 //putpixel(x, y, color);
 bmp.SetPixel(x, y, Color.Red);
 //my code

 if (edge == 1)
 
 edge_one_Tranglex.Add(x);
 edge_one_Trangley.Add(y);
 
 if (edge == 2)
 
 edge_two_Tranglex.Add(x);
 edge_two_Trangley.Add(y);
 
 if (edge == 3)
 
 edge_three_Tranglex.Add(x);
 edge_three_Trangley.Add(y);
 
 if (edge >= 4)
 !Pointsy.Contains(y))
 
 Pointsx.Add(x);
 Pointsy.Add(y);
 
 

 numerator += shortest;
 if (!(numerator < longest))
 
 numerator -= longest;
 x += dx1;
 y += dy1;
 
 else
 
 x += dx2;
 y += dy2;
 
 
 edge++;
 // edge_two_Trangle.ForEach(p => Console.WriteLine(p));
 

 void D_Triangle(int x1, int y1, int x2, int y2, int x3, int y3)
 
 D_line(x1, y1, x2, y2);
 D_line(x2, y2, x3, y3);
 D_line(x3, y3, x1, y1);
 int a = edge_two_Tranglex.Count();

 for(int i =1; i < a -1;)
 
 line(center_x + x1, center_y - y1, edge_two_Tranglex[i], edge_two_Trangley[i]);
 i++;