Label: C ++ polygon processing clipper Library Clipper
Official site of SourceForge: http://sourceforge.net/projects/polyclipping/
1. Version differences
Previously, 4.8.6 was used in the project and was recently upgraded to the latest version 6.2.1. The interface layer is slightly different:
The old version uses the polygon concept. The latest version uses path instead of polygon, and replaces polyg
Decomposing polygons with GPC(Owed by: Spring Night rain Http://blog.csdn.net/chunyexiyu reprint please indicate the source)Gpc:generic Polygon ClipperGPC supports decomposition polygon, polygon differential set, intersection, XOR, and setGpc_diff,/* difference */Gpc_int,/* intersection */Gpc_xor,/* Exclusive or */Gpc_union/* UNION */Use is more efficient, but because of the use of C writing, the grammatical structure and our usual C + + slightly different, directly look at the interface impleme
only be used within a function are called "local variables".Note: The var keyword is omitted anywhere, and the variables defined are "global variables" (which can be used outside of the function) so, in general, do not omit the var keyword.Assignment Value and assignment address:Assignment value: Used to assign a basic data type (only one value) to a variable.Reference address: Used to assign a composite data type (possibly with multiple values) to a variable. All two variables change at the sa
They have a common advantage is "change the whole, to avoid the input error" What are the two different? Some.The main difference is that the macro definition is done prior to compilation, and the const is processed during the compilation phaseMacros define constants that do not occupy memory cells and are defined by const occupy memory unitsA macro definition has the same effect as a const constant-----t
//A.cppclassa{ Public: intFunintx) { return(x*x+ +); } }; voidtt () {}//B.cppclassa{ Public: intFunintx); }; voidtt (); intyy () {TT (); A; returnA.fun (3); }Compile them and then link them separately:A link error was displayed because a reference to A::fun (int) could not be found in B.cpp (B.O).Change the a.cpp above to read as follows:Class a{ public: int fun (intint A:: Fun (int x) { return (x*x+); } void tt () { } Compile the a.cpp again wit
(c.defer,32), +, ' RELY ', null), C.mtime, Decode (c.type#, 2, U I.name, 3, ui.name, NULL), Decode (c.type#, 2, Oi.name, 3, oi.name, NULL), Decode (Bitand (C.defer, 256), 256, Decode (c.type#, 4, Case when (Bitand (c.defer,) = or O.status in (3, 5) or Ro.status in (3, 5) and then ' INVALID ' else nul L End, case when (Bitand (C.defer, m) = O.status in (3, 5)) the N ' INVALID ' else null end), NULL), Decode (Bitand (C.defer, (), "DEPEND on VIEW", null) from sys.con$ OC, sys.con$ RC,
To write a good C language, a beautiful macro definition is very important. Macro definitions can help us prevent errors, improve code portability and readability, and more.In the software development process, there are often common or common functions or code snippets that can be written as functions or encapsulated as macro definitions. So is the function good or the macro definition good? This requires u
Address: http://wt.vankeweekly.com/blog/%B4%F3%CA% AB /articles/11884.html
Causal relationship, inus definition, and suppes Definition
We know that causal relationships are very important for us to think about any problem and do anything. Many people even think that the causal association ability of talent is one of the first conditions for human beings to become a "Everlasting thing. In philosophy, there a
I. Issues/Needs
Scene:
The client displays data from the server side;
There are many data items (item), and may increase or decrease;
The definition (definition) of each data item may also change
The display of data will be based on its definition
Analysis:
Although the definition may change, the frequency is re
In the previous article, we tried to use list template to help us quickly create a schema in our list definition. XML file, you may find that we cannot copy the corresponding definition content in the list template.The corresponding content in list definition is different in description, which is normal because list template and list
Python array definition method, python array Definition
This article describes how to define Python arrays. We will share this with you for your reference. The details are as follows:
Python does not have an array data structure, but the list is similar to an array, for example:
a=[0,1,2]
In this case, a [0] = 0, a [1] = 1, a [[2] = 2, but a problem occurs, that is, what if array a is to be defined as 0 to
JavaScript scope, context, definition and call of function objects, definition and call of anonymous functions, and closureThe introduction of closures always gives people a deep feeling that there are countless examples on the Internet. However, I found that a considerable amount of data is not easy to understand. According to my observations, these examples combine the concepts mentioned in the title and
Array definition and initialization, array definition Initialization
I. Definition
The dimension of the array must be defined by a constant expression greater than or equal to 1.
Integer const object initialized by a nominal value constant, enumerative constant, or constant expression;
Ii. Initialization
1. Display initialization array elements
* The built-in arr
int x = 1234; it is a variable declaration plus definition. Variables can be declared repeatedly, as long as they do not conflict with each other, but can be defined only once.However, const int x = 1234; is also the global definition of "variable" (if declared, it should be const int X;), but can appear in the header file, when multiple CPP files contain this header file, it is equivalent that each CPP fi
(this.name);}var obj1={Name: "I am Obj1",METHOD:A//property is a function}Obj1.method (); The context of the function object is obj1Also use keyword call, apply to explicitly change the context of a functionFor example:function A () {alert (this.name);}var obj1={Name: "I am Obj1",}A.call (OBJ1); The context of the function is Obj13. Definition and invocation of function objectsThis is a trivial, definition
PHP full Binary Tree definition and implementation example, php Binary Tree definition example
This example describes the PHP full Binary Tree definition and implementation method. We will share this with you for your reference. The details are as follows:
If the depth of a binary tree is set to h, in addition to layer h, other layers (1 ~ H-1) are all reached th
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