pinchzoom

问题 I'm trying to create an application with a zoomable/pannable canvas. Features : zoom in/out with mouse wheel at pivot points drag nodes around on the canvas with left mouse button drag the entire canvas with right mouse button The zooming at the pivot point works as long as you start the zooming at scale 1. Position the mouse over a grid point and scroll the mouse wheel. The pivot point will remain where you started zooming. Problem : When you zoom in, then move the mouse to another point and

问题 I drawn some arc and lines in a canvas using WIN2D.To implements pan and pinch in the canvas image I was used the code below... XAML </Canvas>--> <ScrollViewer x:Name="scrollViewer" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" Margin="-0,0,0,0" Height="806" ZoomMode="Enabled" MinZoomFactor="0.5" MaxZoomFactor="8000" ViewChanged="scrollViewer_ViewChanged"> <Grid Margin="-10,0,0,0"> <canvas:CanvasControl x:Name="ManipulateMe" Draw="Preview_Draw" Margin="-11,1,0,0"

问题 I drawn some arc and lines in a canvas using WIN2D.To implements pan and pinch in the canvas image I was used the code below... XAML </Canvas>--> <ScrollViewer x:Name="scrollViewer" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" Margin="-0,0,0,0" Height="806" ZoomMode="Enabled" MinZoomFactor="0.5" MaxZoomFactor="8000" ViewChanged="scrollViewer_ViewChanged"> <Grid Margin="-10,0,0,0"> <canvas:CanvasControl x:Name="ManipulateMe" Draw="Preview_Draw" Margin="-11,1,0,0"

问题 I want to be able to resize and move an image in SwiftUI (like if it were a map) with pinch to zoom and drag it around. With UIKit I embedded the image into a UIScrollView and it took care of it, but I don't know how to do it in SwiftUI. I tried using MagnificationGesture but I cannot get it to work smoothly. I've been searching about this for a while, does anyone know if there's an easier way? 回答1: The SwiftUI API is pretty unhelpful here: the onChanged gives number relative to start of

问题 How to calculate the coordinates with respect to image after zoom the image? To zoom the image I followed the url: https://github.com/MikeOrtiz/TouchImageView/blob/master/src/com/example/touch/TouchImageView.java. if we touch the image at particular point before Zoom then corresponding values are point:(3,2) top left corner of image:(0,0) top left corner of screen:(0,0) scale factors:(1.25,0.98) After zoom the image: if we drag the image until the image top left corner coincides the screen

问题 I have a little problem with my app. I have just implemented pinch zoom, but when I pinch to zoom, the image does not scale at the centre of the 2 points as displayed in the images below. Image 1 is where my fingers are before pinching and image 2 is to display that it has not scaled out at the centre of my fingers like it should. Image 1 vs Image 2: Here is my code: package com.jpiionefourone.guitarimage; import android.content.Context; import android.graphics.Canvas; import android.graphics

问题 I have an image in a scrolling div : <div style=" width:600px;height:400px; overflow:scroll; position:relative; top:0;left:0; -webkit-overflow-scrolling: touch;"> <img src=image.jpg width=2000 height=2000> </div> It works everywhere as expected, except that on iOS (8.1.3), when I zoom in using my fingers, the DIV stops scrolling correctly . One can still scroll to a certain point, but i t is impossible to view the entire image except when it's barely zoomed at all. I have tried hundreds of

问题 i am using visit How can I get zoom functionality for images? and got a project from visit https://github.com/MikeOrtiz/TouchImageView . But when i am doing run it . i got a image and did not get any Pinch zoom . Do i need to change in this code:- TouchImageView img = new TouchImageView(this); // ImageView img = new ImageView(this); Bitmap snoop = BitmapFactory.decodeResource(getResources(), R.drawable.snoopy); img.setImageBitmap(snoop); img.setMaxZoom(4f); setContentView(img); please expert

问题 I have to add functionality of Pinch ZoomIn/Out effect on image using jqueryMobile Plugin, can any one help? Thanks alot, --Brock 回答1: It is possible on jQuery Mobile, but you will need to use a 3rd party implementation called hammer.js. It supports a large number of gestures like: hold tap doubletap drag, dragstart, dragend, dragup, dragdown, dragleft, dragright swipe, swipeup, swipedown, swipeleft, swiperight transform, transformstart, transformend rotate pinch, pinchin, pinchout touch

问题 I would like to use pinch to zoom on page-content. I tried this in myapp.js but it still does not work. Did i forget something? jquery, hammer js and jquery hammer js (wrapper) are initialized var mc = $(".page-content").hammer(); mc.add(new Hammer.Pinch({ threshold: 0 })); 回答1: There are two problems in your question: How to handle pinch with hammer How to properly zoom using Javascript + CSS I posted an answer to a similar question about zooming in Javascript + CSS (which is your problem #2