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课件实例|2.8 长方体的展开

  • 2026-04-25 21:45:16
课件实例|2.8 长方体的展开

利用拉杆实现长方体面的展开。

构造一个长方体,利用旋转、平移等绘制展开的5个面,通过拉杆实现展开的效果

1.构造长方体

构造任意点A,分别将点A垂直方向平移1cm、水平方向平移1cm、水平垂直方向同时平移1cm,得到点A'、A''A'''构造射线AA'AA''AA''',在射线AA'AA''AA'''分别构造线段AB、AD、AE。并隐藏点A'A''A'''和三条射线

2构造长方体

依次选择点A、点D,点击【变换】【标记向量】选择点B,点击【变换】→【平移】,得到C

依次选择点A、点E,点击【变换】→【标记向量】,选择点B、点C、点D,点击【变换】→【平移】,得到点F、G、H,构造长方体ABCD-EFGH隐藏3条射线。2-8-1

2-8-1

2.制作水平五等分拉杆与点值

构造以Z为动点的水平五等分拉杆。

shift键,分别度量点Z在各线段的值2-8-2

2-8-2

3.上面的展开

1)建立参数公式

线段AE,点击【度量】→【长度】得到线段AE的长度值新建参数,编辑得到以下公式:

2构造展开面

垂直平移F、B,垂直方向选中公式AE×2”进行平移,得到点F'、B'

选中点B',双击点B,点击【变换】→【缩放】,缩放参数选择“t1=0.6”,得到点B"依次选择点B、B"、F,点击【构造】→【过三点的弧】隐藏点B、B"、F

将动点Z移到线段XY上,右击弧线,选择在弧上绘制点,选ZXY,得到点I。依次中点F和点G,点击【变换】→【标记向量】选择点I按照标记向量平移,得到I构造线段IF、II、IG,隐藏圆弧。如2-8-3。

2-8-3

4.左侧面的展开

水平平移F、B,水平方向选中公式-AE×2”进行平移,得到点F'、B

选中B,双击点B,点击【变换】→【缩放】,缩放参数选择“t2=0.7”,得到点B"。依次选择点B、B"、F点击【构造】→【过三点的弧】隐藏点BB、F

将动点Z移到线段YY上,右击弧线,选择在弧上绘制点,选择ZYY得到K

依次中点FE,点击【变换】→【标记向量】选中点K按标记向量进行平移得到K'构造线段FK、KK'、K'E,隐藏圆弧。2-8-4

2-8-4

5.右侧面的展开

水平平移C、G,水平方向选中公式AE×2”进行平移,得到点C、G

选中C,双击点C,点击【变换】→【缩放】,缩放参数选择“t2=0.7”,得到点C。依次选择点CC、G点击【构造】→【过三点的弧】隐藏点CC"、G'。

将动点Z移到线段YY上,右击弧线,选择在弧上绘制点,选择ZYY得到L

依次中点GH,点击【变换】→【标记向量】选中点L按标记向量进行平移得到L构造线段GL、LL、LH,隐藏圆弧。2-8-5

2-8-5

6.下面的展开(早于前面的展开制作)

垂直平移E、A,垂直方向选中公式-AE×2”进行平移,得到点E、A

选中A,双击点A,点击【变换】→【缩放】,缩放参数选择“t2=0.7”,得到点A"。依次选择点AA"、E点击【构造】→【过三点的弧】隐藏点AA、E

将动点Z移到线段Y'''Y''上,右击弧线,选择在弧上绘制点,选择ZY'''Y''得到N

依次中点E、H,点击【变换】→【标记向量】选中点N按标记向量进行平移得到N构造线段EN、NN、NH,隐藏圆弧。2-8-6

2-8-6

7.前面的展开

选中N和线段AB,点击【构造】→【以圆心和半径绘圆】构造射线EN,与圆交于点Q,隐藏射线EN。构造直线AB选中直线AB和,点击构造→【交点,得到R、S。如图2-8-7。

2-8-7

依次选择点E和点A,单击【变换】→【标记向量】选择交点R,单击【变换】→【平移】,得到R双击点R选中点R,点击【变换】→【缩放】,缩放参数选择“t2=0.7”,得到点R

依次选择点RR、Q,点击【构造】→【过三点的弧】隐藏点RR'R"、Q,隐藏直线AB

选中点A、D编辑→【操作类按钮→【显示/隐藏,得到按钮“隐藏点”。

将动点Z移到线段Y''Y'''上,右击弧线,选择在弧上绘制点,选择ZY''Y''',得到点T。依次选中点E、H,进行标记向量选中点T,按标记向量平移,得到点T',隐藏圆弧。

点击按钮“隐藏点”,构造线段NT、TT、TN。如图2-8-8。

2-8-8

8.调整美观

把展开后的长方体棱变成虚线给不同的面构造内部,显示不同的颜色予以区分隐藏不要的对象

END

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  1. CONNECT:[ UseTime:0.000372s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000535s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000278s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000249s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000466s ]
  6. SELECT * FROM `set` [ RunTime:0.000230s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000643s ]
  8. SELECT * FROM `article` WHERE `id` = 460106 LIMIT 1 [ RunTime:0.013635s ]
  9. UPDATE `article` SET `lasttime` = 1777199505 WHERE `id` = 460106 [ RunTime:0.007270s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000254s ]
  11. SELECT * FROM `article` WHERE `id` < 460106 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001283s ]
  12. SELECT * FROM `article` WHERE `id` > 460106 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001200s ]
  13. SELECT * FROM `article` WHERE `id` < 460106 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003854s ]
  14. SELECT * FROM `article` WHERE `id` < 460106 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003076s ]
  15. SELECT * FROM `article` WHERE `id` < 460106 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002129s ]
0.105359s