Thuật toán DDA Line trường hợp 0<=k<=1

Code Demo vẽ đoạn thằng AB với A(100,100); B(300,200)
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<graphics.h>
#include<math.h>
// ham lam tron
int Round(float a){
return (int)floor(a+0.5);
}
// DDA Line
void DDA_Line(int x1,int y1, int x2, int y2, int color){
int x=x1;
float y=y1,m=(float)(y2-y1)/(x2-x1);
putpixel(x1,y1,color);
for(x=x1;x<=x2;x++)
{
y=y+m;
putpixel(Round(x),y,color);
}
}
// ham main
void main(){
clrscr();
int driver=DETECT, mode;
initgraph(&driver,&mode,"C:\\TC\\BGI");
cout<<"\n Ve duong thang:\n";
gotoxy(100,100);
DDA_Line(100,100,300,200,4);
getch();
}Thuật toán Bresenham Line trường hợp 0<=k<=1

Code Demo vẽ đoạn thằng AB với A(100,100); B(300,200)
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<graphics.h>
#include<math.h>
// ham lam tron
int Round(float a){
return (int)floor(a+0.5);
}
// Bresenham_Line
void Bre_Line(int x1, int y1, int x2, int y2, int c)
{
int x, y, dx, dy,p,const1,const2;
y = y1;
dx = x2 - x1;
dy = y2 - y1;
p = 2*dy - dx;
const1 = 2*dy;
const2 = 2*(dy-dx);
for (x=x1; x<=x2; x++) {
putpixel(x, y, c);
if (p < 0)
p += const1; // p=p + 2dy
else {
p +=const2; //p=p+2dy-2dx
y++;
}
}
}
// ham main
void main(){
clrscr();
int driver=DETECT, mode;
initgraph(&driver,&mode,"C:\\TC\\BGI");
cout<<"\n Ve duong thang:\n";
gotoxy(100,100);
Bre_Line(100,100,300,200,4);
getch();
}
Thuật toán MidPoint Line trường hợp 0<=k<=1

Code Demo vẽ đoạn thằng AB với A(100,100); B(300,200)
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<graphics.h>
#include<math.h>
// ham lam tron
int Round(float a){
return (int)floor(a+0.5);
}
// MidPoint_Line
void Mid_Line(int x1, int y1, int x2, int y2, int c)
{
int x, y, dx, dy,d;
y = y1;
dx = x2 - x1;
dy = y2 - y1;
d= dy - dx/2;
for (x=x1; x<=x2; x++)
{
putpixel(x, y, c);
if (d <= 0)
d = d + dy;
else
{
y ++;
d = d + dy - dx;
}
}
}
// ham main
void main(){
clrscr();
int driver=DETECT, mode;
initgraph(&driver,&mode,"C:\\TC\\BGI");
cout<<"\n Ve duong thang:\n";
gotoxy(100,100);
Mid_Line(100,100,300,200,4);
getch();
}



































