#include <iostream>
#include <graphics.h>//This reference Easyx graphics library
#include <conio.h>
#include <time.h>
#include <math.h>
#include <stdlib.h>
using namespace Std;
Bresenham Drawing Line
void Bresenham_line (int x0,int y0,int x1,int y1)
{
int x,y,dx,dy;
float k,e;
dx=x1-x0;
Dy=y1-y0;
k=dy/dx;//here is the initialization of the completion K value
e=-0.5;
x=x0;
Y=y0;
Here I always add a word to the end, y this is optional add one or do not add
for (int i=0;i<=dx;i++)
{
The function of drawing points
Putpixel (x,y,255);
x=x+1;
E=e+k;
if (e>=0)
{
y=y+1;
e=e-1;//if E is greater than 0, you need to lose one immediately.
}
}
} Midpoint Draw Line
void Midpointline (int x0,int y0,int x1,int y1)
{
int a,b,delta1,delta2,d,x,y;
A=y0-y1;
b=x1-x0;
D=2*a+b;
The 2 here is to avoid the calculation of decimals
Delta1=2*a;
delta2=2* (A+B);
x=x0;
Y=y0;
Putpixel (x,y,255);
while (X<X1) {
if (d<0) {//This will select the above point
x++;y++;d +=delta2;
}else{//Select one of the following points
x + +;d +=delta1;
}
Putpixel (x,y,255);
}
} Midpoint Draw Line void MidpointLine2 (int x1,int y1,int x2,int y2,colorref color)//Midpoint drawing line method
{
int x = x1, y = y1; Initialize x, y
int a = Y1-y2, B = x2-x1; A, b increments of x and Y, respectively
Consider the four scenarios in which increments are calculated separately
int DELTX = (b >= 0? 1: (b =-B,-1));
int delty = (a <= 0? 1: (A = A,-1)); for (int i=0;i<=400;i++)
{putpixel (i, J, color);p utpixel (+, I, color);}
putpixel (x+200, y+200, color); int D, DELT1, DELT2;
if (-a <= b) //slope absolute Value <= 1
{
d = 2 * a + B;
&NBSP;&NBSP;DELT1 = 2 * A;
&NBSP;&NBSP;DELT2 = 2 * (A + B);
while (x! = x2)
{
if (d < 0)
y + = Delty, D + = DELT2;
else
d + = DELT1;
x + = Deltx;
putpixel (x+200, y+200, color);
}
}
else //Slope Absolute value > 1
{
d = 2 * b + A;
&NBSP;&NBSP;DELT1 = 2 * b;
&NBSP;&NBSP;DELT2 = 2 * (A + B);
while (Y! = y2)
{
if (d < 0)
d + = DELT1;
else
x + = Deltx, D + = DELT2;
y + = delty;
putpixel (x+200, y+200, color);
}
}
} Midpoint Draw Circle
void midpointcircle (int x0,int y0,int r,int color) {
int x=0,y=r;
float D=5.0/4-r;
while (x<=y) {
Putpixel (X0+x,y0+y,color);
Putpixel (X0+x,y0-y,color);
Putpixel (X0-x,y0+y,color);
Putpixel (X0-x,y0-y,color);
Putpixel (X0+y,y0+x,color);
Putpixel (X0+y,y0-x,color);
Putpixel (X0-y,y0+x,color);
Putpixel (X0-y,y0-x,color);
if (d<0)
d+=x*2.0+3;
else{
d+=2.0* (x-y) +5;y--;
}
x + +;
}
} Bresenhem Draw a circle void bresenhemcircle (int centerx, int centery, int radius, int color)
{
int x = 0;
int y = radius;
int delta = (1-radius);
int direction;
while (y >= 0) {
Putpixel (centerx+x, centery+y, color);
Putpixel (centerx-x, centery+y, color);
Putpixel (centerx-x, centery-y, color);
Putpixel (centerx+x, centery-y, color);
if (Delta < 0) {
if ((delta+y)-1) < 0) {
Direction = 1;
}
else {
Direction = 2;
}
}
else if (Delta > 0) {
if ((delta-x)-1) <= 0) {
Direction = 2;
}
else {
Direction = 3;
}
}
else {
direction=2;
}
switch (direction) {
Case 1:
x + +;
Delta + = (2*x+1);
Break
Case 2:
x + +;
y--;
Delta + = (x-y+1);
Break
Case 3:
y--;
Delta + = ( -2*y+1);
Break
}
}
}
void Main ()
{
int x0,y0,x1,y1;
Initgraph (640, 480);
Bresenham_line (10,10,56,56);
MidpointLine2 (0,100,369,0,255);
Midpointcircle (100,100,50,255);
Bresenhemcircle (100,100,100,255); Getch (); Press any key to continue
Closegraph (); Close the graphical interface
} Many also do not say, the source code can be used directly, but also with the axis of |
