pan | 易学教程

How to pan an inline SVG smoothly with Javascript

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问题 In a Cordova/Android app that I am creating I have to implement my own zooming & panning (no libraries allowed nor suitable) of an inline SVG image. My effort thus far is shown below. var _hold = {zoom:1}; function preparePanZoom() { var actuY,scaleX,scaleY; _hold.factorX = 1600/window.innerWidth; actuY = (0.855*window.innerHeight); _hold.factorY = 770/actuY; _hold.displaceY = 0.145*window.innerHeight; scaleX = 1/_hold.factorX; scaleY = 1/_hold.factorY; _hold.panMax = [0,_hold.displaceY -

ExtJS + JQuery/Flot: mousedown event for the plot container

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问题 I realized that in flot there is a confliction between "plotpan" event and "mousedown" event. if enable the plot pannable, then mousedown wont work in the plot area; also, if disable "plotpan" event, but enable "plotclick" event and "mousedown" event, it turns out that only mousedown works but plotclick doesnt. how can I make sure that these three or more events can work in a more apporpriate way? demo codes are attached as follows: <html> <head> <title>A Test Page</title> <!-- JQUERY/FLOT

Pan PictureBox inside a Panel on Mouse Move

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问题 I've a pictureBox1 which is inside Panel1, both of same size. The pictureBox1 is resized on MouseWheel event, when the pictureBox1 size is bigger then Panel1 size then the user can Pan PictureBox1 on Mouse_Move event (want to move with mouse drag, not scroll bars). I've written a code which prevents users to Pan past the Panel1 borders. Right now the code can prevent only Top-Left orner and Bottom-Right corner. The problem in my code is when the user pans to Top-Right corner or Bottom-Left

d3.js limit panning in force layout

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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

Why I use “pan” after rotae will make view go opposite way?

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问题 Why using "pan" after rotate makes view go opposite way? It seems these two gesture are use diffrent coordinate system? Rotation use the one is rotated,and pan use the normal one? And if the view is rotated nearby 0' or 360 ',pan will be normal,and if the view is rotated more colse to 180',the "pan" will make view go opposite more. Thanks. 回答1: The point is that in your handRotate method you are assigning a rotation transformation to your view. This entails a permanent (until you modify the

three.js: Rotate around origin after panning camera

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问题 I have a plane/board, with a grid, that is about 1100 x 1100. I have panning, zooming, and rotating working except for the fact that the board moves back to the center of the screen after it has been panned. So, if I don't pan the board at all then everything works. After I pan the board it moves back to the center of the screen when I try to rotate it. I cannot figure out how to change the origin of the camera so that it rotates around the center of the board. It seems like it rotates around

Prevent UIPageViewController's swipe from affecting a UISlider

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问题 I've seen this question asked in other areas but none of the answers work in my case. I have a UIPageViewController that has a child view controller containing a UISlider. When you go to try to move the slider, it activates the page view controller's scrolling instead. You have to tap, pause on the slider circle, and then move. The UIPageViewController is set to the scroll type, and thus the gestureRecognizers are not set. (The header states "Only populated if transition style is

Controlling the pan (to anchor a point) when zooming into an image

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问题 I'm writing a simple image viewer and am implementing a pan and zoom feature (using mouse dragging and mouse wheel scrolling respectively). I've successfully implemented the pan (easy mode) and a naive ' into top left corner ' zoom. I'd now like to refine the zoom such that the coordinate of the user's mouse when zooming becomes the 'focal point': that is, when zooming, the pan is updated so that the pixel (of the image) under the user's mouse stays the same (so that they're really zooming

【Pandas教程】像写SQL一样用Pandas～

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写在最前 Python在数据分析领域有三个必须需要熟悉的库，分别是 pandas , numpy 和 matplotlib ，如果排个优先级的话，我推荐先学 pandas 。 numpy 主要用于数组和矩阵的运算，一般在算法领域会应用比较多。 matplotlib 用于作图的话其实可替代的库会比较多，譬如有封装的更高级的 seaborn ，调用起来会更方便，也有交互性更强的 pyecharts ,风格会更讨喜。但对于 pandas ，似乎完全绕不开，当然这三个库都是非常优秀的库，如果你已经入坑数据分析，建议全学🌝。 *** 基本用法读取数据 SQL sql读取数据其实没啥可说的，一句简单的 select * from table_name 就OK了。 Pandas pandas 支持的数据源很多，包括csv，excel，以及读取数据库，当然读取数据库的话需要配合其他库，包括oracle，mysql，vertica等等都是支持的。常见的如下： pandas.read_csv() ：用于读取csv文件； pandas.read_excel() ：用于读取Excel文件； pandas.read_json() ：用于读取json文件； pandas.read_sql() ：用于读取数据库，传入sql语句，需要配合其他库连接数据库。由于我本地没有数据库资源，我这边就已csv文件为例

d3 collapse tree zoom and pan - jumpiness after clicking a node

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问题 If I zoom/pan after I clicked a node my scaling and zooming jumps back to original position. Here is my zooming function: zoom: function() { var scale = d3.event.scale, translation = d3.event.translate, tbound = -h * scale, bbound = h * scale, lbound = (-w + m[1]) * scale, rbound = (w - m[3]) * scale; // limit translation to thresholds translation = [ Math.max(Math.min(translation[0], rbound), lbound), Math.max(Math.min(translation[1], bbound), tbound) ]; d3.select(".drawarea") .attr(