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JS implements the collision judgment method, and js implements collision

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Author: User
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JS implements the collision judgment method, and js implements collision

This article describes how to implement collision determination in JavaScript. Share it with you for your reference. The details are as follows:

JS collision judgment method:
Copy codeThe Code is as follows:/** determines whether a collision exists.
* @ Param obj original object
* @ Param dobj: target object
*/
Function impact (obj, dobj ){
Var o = {
X: getDefaultStyle (obj, 'left '),
Y: getDefaultStyle (obj, 'top '),
W: getdefastyle style (obj, 'width '),
H: getDefaultStyle (obj, 'height ')
}

Var d = {
X: getDefaultStyle (dobj, 'left '),
Y: getDefaultStyle (dobj, 'top '),
W: getdefastyle style (dobj, 'width '),
H: getDefaultStyle (dobj, 'height ')
}

Var px, py;

Px = o. x <= d. x? D. x: o. x;
Py = o. y <= d. y? D. y: o. y;

// Determine whether all vertices are in two objects
If (px> = o. x & px <= o. x + o. w & py> = o. y & py <= o. y + o. h & px> = d. x & px <= d. x + d. w & py> = d. y & py <= d. y + d. h ){
Return true;
} Else {
Return false;
}
}

/** Get Object Attributes
* @ Param obj object
* @ Param attribute
*/
Function getDefaultStyle (obj, attribute ){
Return parseInt (obj. currentStyle? Obj. currentStyle [attribute]: document. defaultView. getComputedStyle (obj, false) [attribute]);
}

Example:
Copy codeThe Code is as follows: <! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd">
<Html>
<Head>
<Title> demo </title>
<Style type = "text/css">
Body {margin: 0px ;}
. Main {position: relative ;}
# F1 {position: absolute; background: # FF0000; top: 100px; left: 100px; width: 200px; height: 200px; z-index: 999}
# F2 {position: absolute; background: # FFFF00; top: 0px; left: 0px; width: 600px; height: 150px ;}
</Style>
</Head>
<Body>
<Div class = "main">
<Div id = "f1"> </div>
<Div id = "f2"> </div>
</Div>
<Script type = "text/javascript">
Var o = document. getElementById ("f1 ");
Var d = document. getElementById ("f2 ");
Alert (impact (o, d ));

Function impact (obj, dobj ){
Var o = {
X: getDefaultStyle (obj, 'left '),
Y: getDefaultStyle (obj, 'top '),
W: getdefastyle style (obj, 'width '),
H: getDefaultStyle (obj, 'height ')
}

Var d = {
X: getDefaultStyle (dobj, 'left '),
Y: getDefaultStyle (dobj, 'top '),
W: getdefastyle style (dobj, 'width '),
H: getDefaultStyle (dobj, 'height ')
}

Var px, py;

Px = o. x <= d. x? D. x: o. x;
Py = o. y <= d. y? D. y: o. y;

// Determine whether all vertices are in two objects
If (px> = o. x & px <= o. x + o. w & py> = o. y & py <= o. y + o. h & px> = d. x & px <= d. x + d. w & py> = d. y & py <= d. y + d. h ){
Return true;
} Else {
Return false;
}
}

Function getDefaultStyle (obj, attribute ){
Return parseInt (obj. currentStyle? Obj. currentStyle [attribute]: document. defaultView. getComputedStyle (obj, false) [attribute]);
}
</Script>
</Body>
</Html>

I hope this article will help you design javascript programs.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
extends and implements php implements and extends java extends and implements smi collision cms collision difference between extends and implements namespace collision

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