1 #include<stdio.h>
2
3 #include"graphics.h"
4
5 #include<math.h>
6
7 #include<stdlib.h>
8
9
10
11 void DDALine(int x0, int y0, int x1, int y1);
12
13
14
15 int main()
16
17 {
18
19 int gdriver = DETECT, gmode;
20
21
22
23 int x0, y0, x1, y1;
24
25 printf("please input the start point:\n");
26
27 scanf_s("%d%d", &x0, &y0);
28
29 printf("please input the end point:\n");
30
31 scanf_s("%d%d", &x1, &y1);
32
33
34
35 initgraph(&gdriver, &gmode, ""); //初始化图形界面
36
37
38
39 DDALine(x0, y0, x1, y1);
40
41
42
43 system("pause"); //暂停函数
44
45
46
47 closegraph(); //关闭图形界面
48
49 }
50
51
52
53 void DDALine(int x0, int y0, int x1, int y1)
54
55 {
56
57 int dx=x1-x0, dy=y1-y0,k;
58
59 double x = x0, y = y0, xIncre, yIncre, espl;
60
61 espl = abs(dy);
62
63
64
65 if (abs(dx) > abs(dy))
66
67 espl = abs(dx);
68
69
70
71 xIncre = 1.0*dx / espl;
72
73 yIncre = 1.0*dy / espl;
74
75
76
77 for (k = 0; k < espl;k++)
78
79 {
80
81 putpixel((int)x, (int)y, RED);
82
83 x += xIncre;
84
85 y += yIncre;
86
87 }
88
89 }
