dda算法

Here you will learn about dda line drawing algorithm in C and C++.

在这里，您将了解C和C ++中的dda线条绘制算法。

In Computer Graphics the first basic line drawing algorithm is Digital Differential Analyzer (DDA) Algorithm.

在计算机图形学中，第一个基本的线条绘制算法是数字差分分析器(DDA)算法。

A line connects two points. It is a basic element in graphics. To draw a line, you need two points between which you can draw a line.

一条线连接两个点。 它是图形中的基本元素。 要绘制一条线，您需要两个点之间可以绘制一条线。

Also Read: Bresenham’s Line Drawing Algorithm in C and C++

另请参阅： Bresenham的C和C ++线条画算法

数字差分分析仪(DDA)算法 (Digital Differential Analyzer (DDA) Algorithm)

Step 1: Read the input of the 2 end points of the line as (x1, y1) & (x2, y2) such that x1 != x2 and y1 != y2

步骤1：将线的两个端点的输入读取为(x1，y1)＆(x2，y2)，以使x1！= x2和y1！= y2

Step 2: Calculate dx = x2 – x1 and dy = y2 – y1

步骤2：计算dx = x2 – x1和dy = y2 – y1

Step 3:

第三步：

if(dx>=dy)

如果(dx> = dy)

step=dx

步长= dx

else

其他

step=dy

步长= dy

Step 4: xin = dx / step & yin = dy / step

步骤4： xin = dx / step和yin = dy / step

Step 5: x = x1 + 0.5 & y = y1 + 0.5

步骤5： x = x1 + 0.5＆y = y1 + 0.5

Step 6: 

步骤6：

for(k = 0; k < step; k++)

for(k = 0; k <步骤; k ++)

{

{

x = x + xin

x = x +鑫

y = y + yin

y = y + yin

putpixel(x, y)

putpixel(x，y)

}

}

C语言中的DDA线图绘制算法程序 (Program for DDA Line Drawing Algorithm in C)

#include <graphics.h>
#include <stdio.h>
#include <math.h>
#include <dos.h>void main( )
{float x,y,x1,y1,x2,y2,dx,dy,step;int i,gd=DETECT,gm;initgraph(&gd,&gm,"c:\\turboc3\\bgi");printf("Enter the value of x1 and y1 : ");scanf("%f%f",&x1,&y1);printf("Enter the value of x2 and y2: ");scanf("%f%f",&x2,&y2);dx=abs(x2-x1);dy=abs(y2-y1);if(dx>=dy)step=dx;elsestep=dy;dx=dx/step;dy=dy/step;x=x1;y=y1;i=1;while(i<=step){putpixel(x,y,5);x=x+dx;y=y+dy;i=i+1;delay(100);}closegraph();
}

Outptut

输出

C ++中DDA线条绘制算法程序 (Program for DDA Line Drawing Algorithm in C++)

#include <graphics.h>
#include <iostream.h>
#include <math.h>
#include <dos.h>void main( )
{float x,y,x1,y1,x2,y2,dx,dy,step;int i,gd=DETECT,gm;initgraph(&gd,&gm,"c:\\turboc3\\bgi");cout<<"Enter the value of x1 and y1 : ";cin>>x1>>y1;cout<<"Enter the value of x2 and y2: ";cin>>x2>>y2;dx=abs(x2-x1);dy=abs(y2-y1);if(dx>=dy)step=dx;elsestep=dy;dx=dx/step;dy=dy/step;x=x1;y=y1;i=1;while(i<=step){putpixel(x,y,5);x=x+dx;y=y+dy;i=i+1;delay(100);}closegraph();
}

Comment below if you have any doubts related above algorithm.

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翻译自: https://www.thecrazyprogrammer.com/2017/01/dda-line-drawing-algorithm-c-c.html

dda算法