我正在尝试使用 Clipper 库来扩展我的避障机器人控制任务中的障碍物图像。但是现在,我什至坚持使用库的示例代码:
(http://www.angusj.com/delphi/clipper.php#code)
//from clipper.hpp ...
//typedef signed long long long64;
//struct IntPoint {long64 X; long64 Y;};
//typedef std::vector<IntPoint> Polygon;
//typedef std::vector<Polygon> Polygons;
...
using namespace ClipperLib;
Polygons subj(2), clip(1), solution;
subj[0].push_back(IntPoint(180,200));
subj[0].push_back(IntPoint(260,200));
subj[0].push_back(IntPoint(260,150));
subj[0].push_back(IntPoint(180,150));
subj[1].push_back(IntPoint(215,160));
subj[1].push_back(IntPoint(230,190));
subj[1].push_back(IntPoint(200,190));
clip[0].push_back(IntPoint(190,210));
clip[0].push_back(IntPoint(240,210));
clip[0].push_back(IntPoint(240,130));
clip[0].push_back(IntPoint(190,130));
DrawPolygons(subj, 0x160000FF, 0x600000FF); // <- identifier not found
DrawPolygons(clip, 0x20FFFF00, 0x30FF0000); // <- identifier not found
Clipper c;
c.AddPolygons(subject, ptSubject);
c.AddPolygons(clip, ptClip);
if (c.Execute(ctIntersection, solution)
DrawPolygons(solution, 0x3000FF00, 0xFF006600);
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我想知道我是否缺少任何库安装?我知道这是一个小问题,我有点菜鸟,但任何帮助都可以减轻我的很多工作。谢谢!
我想知道在C中将机器精度从浮点数增加到两倍会自动提高串联扩展中的项,例如三角函数吗?
这和我关于堆栈溢出的其他问题与调查各向异性介质中波动方程的数值不稳定性有关.
看起来像是在bash中alias-expand-line。
我可以添加到.cshrc_custom文件中的bindkey命令是什么?
相关排序:"^[y"按键绑定指的是什么?我知道^是ctrl什么,但是是什么[?
我读了这篇文章:https : //superuser.com/questions/304807/brace-expansion-run-several-commands-instead-of-expanding-on-one-line,并尝试了其eval echo扩展方式。为什么以下两个命令不同?
指令1:
$ eval echo\ {a,b,c}\;
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结果1:
a
b
c
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指令2:
$ eval echo\ {a,b,c} \;
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结果2:
a echo b echo c
Run Code Online (Sandbox Code Playgroud) 我正在构建一个机制来获取任意CLOS对象并从中返回一个哈希(在我的调试经验中很有用).
但是,我不确定如何强制进行变量扩展.我觉得解决方案在于正确使用gensym,但我不确定如何.
;;helper macro
(defun class-slots-symbols (class-name)
"Returns a list of the symbols used in the class slots"
(mapcar 'closer-mop:slot-definition-name
(closer-mop:class-slots
(find-class class-name))))
;;macro that I am having difficulty with
(defmacro obj-to-hash (obj-inst)
"Reads an object, reflects over its slots, and returns a hash table of them"
`(let ((new-hash (make-hash-table))
(slot-list (class-slots-symbols (type-of ,obj-inst))))
;;The slot-list needs to expand out correctly in the with-slots form
(with-slots (slot-list) obj-inst
(loop for slot in slot-list do ;and also here
(format t "~a~&" …Run Code Online (Sandbox Code Playgroud) 在bash中有一个特殊的问题.我想创建一个脚本,该脚本采用文件名的前缀,并删除以该前缀开头并以某些给定后缀结尾的所有文件.为此,我有以下代码行:
#!/bin/bash
if [ $# -lt 1 ]; then
echo "Please provide an argument";
exit 1
fi
# Ending dot already included in $1
rm -f $1"aux" $1"bbl" $1"blg" $1"synctex.gz" $1"log"
# But even if you call it wrong...
rm -f $1".aux" $1".bbl" $1".blg" $1".synctex.gz" $1 ".log"
exit 0
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不幸的是,当我调用我的脚本(被称为cleanlatex)时,按预期方式:
cmd$ cleanlatex lpa_aaai.
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只删除.aux文件.显然rm -f不会将其应用程序扩展到所有参数,这是我明确运行时所做的事情rm -f lpa_aaai.aux lpa_aaai.bbl ....我在这做错了什么?
编辑:要回答@ Etan的问题,这是我在添加这些命令时看到的内容:
+ '[' 1 -lt 1 ']'
+ rm -v lpa_aaai.aux lpa_aaai.bbl lpa_aaai.blg lpa_aaai.synctex.gz …Run Code Online (Sandbox Code Playgroud) 我计划改用 Fish 作为我的默认 shell,但遇到了一些问题。
在重写我的所有脚本之前,我想使用带有“-c”选项的 bash 重用旧脚本。
例子:
bash -c "cat <<'EOF' | tee filename >/dev/null
$SHELL
$TERM
EOF"
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即使使用'EOF',我总是得到:
/bin/fish
xterm
如果可能的话,我想避免\$SHELL在脚本中的每个变量中使用反斜杠。