transform

问题 I found this great script to make it rain confetti: http://jsfiddle.net/hcxabsgh/ Note how the particles have this twist/turn/skew-effect to make it feel more natural. I have been trying to make the particles round which also works nicely: http://jsfiddle.net/rqr9hb7x/2/ But i can't get the particles to twist/turn/skew around their axes like in the rectangular example. I figured it should be doable with ctx.setTransform(), since it handles skew-parameters, but it seems to skew the whole

问题 This is a follow up to this question. I have a similar setup with n number of views, and I want to rotate them together with the rotation gesture. I know how to apply a rotation to a single view, but here I want to rotate all of them from common center instead of their own. So I tried this approach Calculated a common center point of all selected views Set the view translation pointing to this common center And rotated the view So this is what I got CGPoint newCenter =CGPointZero; for(UIView

问题 Based on an original rect1 (x1, y1, w1, h1) and a known scaled rect2 (x2, y2, w2, h2) what is the formula to find out what transform-origin was used? I need a reusable formula because rect2 can be positioned anywhere. Put another way, I know the bounds of a little rectangle and want it to transition to a bigger rectangle by applying the correct transform-origin coordinates (in px or %). 回答1: In a simple scale, the ratios between the distances x1 -> tx and tx -> (x1+w1) where the transform

问题 I am drawing 4 stacked rectangles, rotating the canvas about a point and then drawing that same shape again but the stacked rectangles aren't remaining completely aligned. Here's a screenshot: As you can see, the first, unrotated block is perfect but the following ones are misaligned. Why is this happening and how can I prevent it? SSCE //Just import everything to keep it short and sweet import java.awt.*; import java.awt.geom.*; import javax.swing.*; @SuppressWarnings("serial") public class

问题 I'm developing an application which involves a slides translating into view as the primary navigation mechanism. The first slide to come in involves several super-imposed PNGs at roughly 2000px squared with transparencies, and there's a notable framerate stutter as the images come into view. Using Chrome Dev Tools' Timeline feature I've established that while most of the individual Paint tasks take under 5 milliseconds each, the significant outliers are those Paint events whose subtasks

问题 My CSS transition doesn't work properly in Chrome. It is giving a blur effect in Chrome but works fine in Firefox. Here is the code snippet for circle animation. I recommend viewing this in Chrome and at the maximum width of your screen. Here is the HTML: <button>Inflate!</button> <div class='bubble'></div> CSS: .bubble { position: relative; left: 50px; top: 20px; transform: scale(1); width: 50px; height: 50px; border-radius: 50%; background-color: #C00; transition-origin: center; transition:

问题 I studying 'transform' in recent days,and now i know how to do translate,rotate,skew,scale by transform's matirx. but if i want to do all actions above in one transform statement, how can i do? ctx.transform(a,b,c,d,e,f); when we want rotate something by transform, we must post 4 arguments for each one (a,b,c,d), So ,if i want rotate and scale, for example, rotate 30 deg and scale (1.5,2), can the transform done them at the same time? so what the values of (a,b,c,d)? and how calculate them?

问题 I've been looking on the web for a while and can't find an answer to my question, but hopefully the community knows. Has anyone test css3 maxtrix compared to css3 transform? I'm using lots of transforms but I see libraries like famo.us and threejs using more of matrices. Is it possible that matrices just have a better performance yield? 回答1: Matrix is more faster, but it has worse browser support: http://jsperf.com/css-matrix-vs-transform-primitives 来源： https://stackoverflow.com/questions

问题 I am using d3.js with a force layout to visualize a large number of nodes. I would like to implement a limitation to the panning option of the zoom. JSFiddle : https://jsfiddle.net/40z5tw8h/24/ The above fiddle contains a simple version of what I am working on. Because I would potentially have to visualize a very large dataset, I use a function to scale down the group holding element ('g') after forces are done. In that way i always have the full visualization visible afterwards. I would like

问题 I have a matrix of 3D points ( positions ), in which every column represents a 3D point expressed in a local frame at a specific time instance. The transforms (row)vector contains the transformation matrix of the moving local frame at each time instance, i.e. the ith transformation matrix corresponds with the ith column of positions . I want to calculate the position in the global frame ( transformed ) by applying the transformation matrixes to their corresponding point. This can be done with