draw

问题 I have written a shiny app that allows the user to draw rectangles on top of an image (minimal reproducible example below). The problem with my current approach is that every time a rectangle is added, a new image is created, written to disk, and rendered (sent to the user's browser). This takes quite some time, and becomes really annoying when the Internet connection is slow. Is there any way to display the rectangles on top of the image directly in the browser , without modifying the image

问题 I have to ask again because no one answered my question before (my problem is NOT a duplicate of How to draw a path on an Android canvas with animation?). Please read it carefully and help me, if possible by providing code. The abouve example is unclear for me, and the Path is created on the flow of drawing. This is NOT what I am looking for... I want to draw ONE Path, that already exist in my View class, by drawing its points with time interval, to simulate an animation. How should I modify

问题 I have referred official document of skia: https://docs.microsoft.com/en-us/dotnet/api/skiasharp.skcanvas?view=skiasharp-1.68.1#constructing-a-pdf-document // create the document var stream = SKFileWStream.OpenStream("document.pdf"); var document = SKDocument.CreatePdf(stream); // get the canvas from the page var canvas = document.BeginPage(256, 256); // draw on the canvas ... // end the page and document document.EndPage(); document.Close(); As per the above code I'm getting canvas, but how

问题 I'm interested in creating a program capable of recognition of numbers, letters, symbols from an image. But first off, I went ahead and started to think about: How your system displays a letter? There are so many fonts, font-sizes and other characteristics. I suppose there is an equation used to generate a letter with given parameters, is that true? Or are there other ways in which your system generates letters? I found such a basic thing so interesting, and I can’t find any information on

问题 When I use Paint with Color.TRANSPARENT on a normal 2D canvas in Android, I don't get any results and my intention was to get rid of some of the contents on the canvas. I mean the contents that I want to dispose of don't disappear. This is the code for my Paint : mPointFillPaint = new Paint(); mPointFillPaint.setColor(Color.TRANSPARENT); mPointFillPaint.setAntiAlias(true); mPointFillPaint.setStyle(Paint.Style.FILL); mPointFillPaint.setStrokeJoin(Paint.Join.MITER); 回答1: The following Paint

问题 The method I am trying to use is the: drawImage(image, int, int, int, int, ImageObserver) method so that i can scale my image, on all the examples i've seen the ImageObserver should be this, but this doesn't seem to work(i.e. the only methods i have seen is: drawImage(image, int, int, ImageObserver), don't know if this makes a difference). Here is my main class that is the applet: import java.applet.*; import java.awt.*; public class Main extends Applet implements Runnable{ private Thread th;

问题 I'm 3 days new to swift, and I'm trying to figure out how to draw a rectangle. I'm too new to the language to know the classes to extend and the methods to override, and I've looked around for sample code, but nothing seems to work (which I'm attributing to my use of swift 3). What I'm trying now is: import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let k = Draw(frame: CGRect( origin: CGPoint(x: 50, y: 50), size: CGSize(width: 100, height:

问题 I'm 3 days new to swift, and I'm trying to figure out how to draw a rectangle. I'm too new to the language to know the classes to extend and the methods to override, and I've looked around for sample code, but nothing seems to work (which I'm attributing to my use of swift 3). What I'm trying now is: import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let k = Draw(frame: CGRect( origin: CGPoint(x: 50, y: 50), size: CGSize(width: 100, height:

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . I'm taking a course in Ruby and in C++ as well and I had to do this problem. You have to draw a circle with asterisk. I searched a lot in the Internet but I couldn't find any complete solution. I want to explain the reasoning so in this way you are not just copying the code, you are going to be

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . I'm taking a course in Ruby and in C++ as well and I had to do this problem. You have to draw a circle with asterisk. I searched a lot in the Internet but I couldn't find any complete solution. I want to explain the reasoning so in this way you are not just copying the code, you are going to be