collision-detection | 易学教程

How do I implement collision detection between a set of Div elements?

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I have this example in jsfiddle I have a var as being the collision element: var $div = $('.container'); and then the collision: function test (){ $('.drag') .drag("start",function( ev, dd ){ dd.limit = $div.offset(); dd.limit.bottom = dd.limit.top + $div.outerHeight() - $( this ).outerHeight(); dd.limit.right = dd.limit.left + $div.outerWidth() - $( this ).outerWidth(); }) .drag(function( ev, dd ){ $( this ).css({ top: Math.min( dd.limit.bottom, Math.max( dd.limit.top, dd.offsetY ) ), left: Math.min( dd.limit.right, Math.max( dd.limit.left, dd.offsetX ) ) }); }); } for: <div class="container"

Sprite Kit Collision Detection

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Hi I am trying to setup collision detection in my game and I want to add collision detection so when the balloons hit the spikes they pop. I have looked at Ray Wenderliches tutorial but I couldn't figure it out because it didn't apply to my case. Any ideas how to set it up for my case? The spikes are at the top of the screen and the balloons spawn at the bottom. user3480028 The basics for setting upp collision between 2 objects is to first setting upp constant that represent the different objects that can collide. I usually make a constants.h file where i keep all the variables that will be

Collision of circular objects

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问题 I'm going to develop carom board game. I'm having the problem with the collision of two pieces. How to find the collision point of two pieces. And then how to find the angle and distance the pieces travel after collision.I found the solution of the collision point at circle-circle collision. here the solution is described with trigonometry, but I want the solution with vector math. With which the problem of the distance covered after collision will also be solve easily. 回答1: You do not need

Circle line-segment collision detection algorithm?

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问题 I have a line from A to B and a circle positioned at C with the radius R. What is a good algorithm to use to check whether the line intersects the circle? And at what coordinate along the circles edge it occurred? 回答1: Taking E is the starting point of the ray, L is the end point of the ray, C is the center of sphere you're testing against r is the radius of that sphere Compute: d = L - E ( Direction vector of ray, from start to end ) f = E - C ( Vector from center sphere to ray start ) Then

Destroy GameObject when its clicked on

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问题 I'm making a building mechanic in my game and I want to be able to clear out certain objects around the map (trees, other decor) so I have room to build. I've tried using a ray cast to find what object is being clicked on and destroy it but that doesn't work. using System.Collections; using System.Collections.Generic; using UnityEngine; public class ObjectDestroy : MonoBehaviour { // Start is called before the first frame update void Start () { } // Update is called once per frame void Update

RayCasting in Libgdx 3d

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问题 Alright so I've been trying for quite some time too Raycast in libgdx for 3d collision detection based on where im looking.. But I've drawn a blank and doesn't seem to be any documentation anywhere. Would someone be kind enough to send me in the right direction? 回答1: It is actually really easy with libgdx to achieve what you are trying to do. The following is what I'm using to do a ray test and find the closest collision object that my ray would hit. Let's assume it is located in a class

What happens when hash collision happens in Dictionary key?

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I've been coding in c++ and java entirety of my life but on C#, I feel like it's a totally different animal. In case of hash collision in Dictionary container in c#, what does it do? or does it even detect the collision? In case of collisions in similar containers in SDL, some would make a key value section link data to key value section like linked list, or some would attempt to find different hash method. [Update 10:56 A.M. 6/4/2010] I am trying to make a counter per user. And set user # is not defined, it can both increase or decrease. And I'm expecting the size of data to be over 1000. So,

C++ library for mesh to mesh intersection: what is available?

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问题 I need to calculate volume intersection and penetration depth between 3D triangular meshes (e.g. in .obj format), but I am quite new to computational geometry. In a previous post (Mesh to mesh intersections) and from my google search, I found a few C++ libraries which might be appropriate to do the job: CGAL PQP libigl SWIFT Though, I am not sure which one could be the most appropriate for a beginner. Any suggestion? 回答1: libigl as of version 1.1 has robust mesh boolean operations in igl

Wanted to make an object bounce inside a circle, ended up making the object move along the rim of the circle

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Here's the code in question: public void calculate() { // Center of circle is at (250, 250). //THIS ALGORITHM IS NOW PROVEN TO BE WORSE THAN I FEARED... /* What it does: * Moves object around in a circle. * Does not move the object towards the center. * Object always stays on the rim of the circle. * * Algorithm I used. (DOES NOT WORK): * N is normalized vector. * R = -2*(V dot N)*N + V */ vx += Accelero.X * 0.1; vy += Accelero.Y * 0.1; double nx = x - 250; double ny = y - 250; double nd = Math.hypot(nx, ny); if (nd == 0) nd = 1; nx /= nd; ny /= nd; double dotProduct = vx * nx + vy * ny; vx +=

Text Collision Detection

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I am building a web application that draws a set of letters in different fonts on an HTML 5 Canvas using fillText . The user will click somewhere on that canvas and I need to check which letter they clicked on (or if they clicked on a letter at all). I think I will need to: Get the vector path for each letter (I have no clue how to do this). Check if the click point is inside the letter path using some simple collision-detection algorithm. Is there some easy function to do this that I am missing? Or maybe a library for things like this? If there aren't any libraries, how do I get the path for