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計算機圖形學---Bresenham畫線算法

Bresenham畫線算法。
[初級版]

?1

void ?Bresenham_line(HDC & ?hdc)
?2

{
?3

????? char ?a[ 20 ];
?4

????? double ?dx,dy;
?5

?????dx = abs(B.x - A.x);?dy = abs(B.y - A.y);
?6

????? int ?tx = (B.x - A.x) >= 0 ? ? ? 1 :? - 1 ;
?7

????? int ?ty = (B.y - A.y) >= 0 ? ? ? 1 :? - 1 ;
?8

????? int ?tag = 0 ;
?9

????? if (dx? < ?dy)
10

????? {
11

??????????tag = 1 ;
12

?????????? double ?temp = A.x;? // x1,y1互換
13

??????????A.x = A.y;
14

??????????A.y = temp;
15

??????????temp = B.x;? // x2,y2互換
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??????????B.x = B.y;
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??????????B.y = temp;
18

??????????temp = dx;? // dx,dy互換
19

??????????dx = dy;
20

??????????dy = temp;
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??????????temp = tx;? // tx,ty互換
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??????????tx = ty;
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??????????ty = temp;
24

?????}
25

????? int ?curx = A.x;
26

????? int ?cury = A.y;
27

????? if (tag)
28

????? {
29

??????????SetPixel(hdc,cury, 600 - curx,RGB( 0 , 0 , 0 ));
30

??????????sprintf(a, " A(%d,%d) " ,cury,curx);
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??????????TextOut(hdc,cury, 600 - curx,a,strlen(a));
32

?????}
33

????? else
34

????? {
35

??????????SetPixel(hdc,curx, 600 - cury,RGB( 0 , 0 , 0 ));
36

??????????sprintf(a, " A(%d,%d) " ,curx,cury);
37

??????????TextOut(hdc,curx, 600 - cury,a,strlen(a));
38

?????}
39

????? double ?d = 2 * dy - dx;
40

????? while (cury <= B.y? && ?curx <= B.x)
41

???? {
42

????????? if (d >= 0 )
43

????????? {
44

??????????????d = d + 2 * (dy - dx);
45

??????????????cury += ty;
46

?????????}
47

????????? else
48

??????????????d = d + 2 * dy;
49

??????????????curx += tx;
50

????????? if (tag)
51

??????????????SetPixel(hdc,cury, 600 - curx,RGB( 0 , 0 , 0 ));
52

????????? else
53

??????????????SetPixel(hdc,curx, 600 - cury,RGB( 0 , 0 , 0 ));
54

????}
55

???? if (tag)
56

???? {
57

????????SetPixel(hdc,cury, 600 - curx,RGB( 0 , 0 , 0 ));
58

????????sprintf(a, " B(%d,%d) " ,cury,curx);
59

????????TextOut(hdc,cury, 600 - curx,a,strlen(a));
60

????}
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???? else
62

???? {
63

????????SetPixel(hdc,curx, 600 - cury,RGB( 0 , 0 , 0 ));
64

????????sprintf(a, " B(%d,%d) " ,curx,cury);
65

????????TextOut(hdc,curx, 600 - cury,a,strlen(a));
66

????}
67

}

posted on 2006-10-07 06:40 TanZek 閱讀(1335) 評論(1) 編輯收藏引用所屬分類: Subject-Study

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