canvas

问题 I was thinking that for some projects I do 60fps is not totally needed. I figured I could have more objects and things that ran at 30fps if I could get it to run smoothly at that framerate. I figured if I edited the requestAnimationFrame shim inside of three.js I could limit it to 30 that way. But I was wondering if there was a better way to do this using three.js itself as provided. Also, will this give me the kind of performance increase I am thinking. Will I be able to render twice as many

问题 I was thinking that for some projects I do 60fps is not totally needed. I figured I could have more objects and things that ran at 30fps if I could get it to run smoothly at that framerate. I figured if I edited the requestAnimationFrame shim inside of three.js I could limit it to 30 that way. But I was wondering if there was a better way to do this using three.js itself as provided. Also, will this give me the kind of performance increase I am thinking. Will I be able to render twice as many

问题 I have been working on making projects inside Google Apps Script but came across a problem. I am currently trying to get the individual pixels of an image, by using an HTML canvas(if you know of another way to get pixel data from an image in JS, please let me know). The problem is, Google Apps Script doesn't seem to have a getContext method for the canvas. I'm not sure if this is done purposely, or if it is some kind of bug. Code: var img = XmlService.createElement('img'); img.src = query;

问题 I am a newbie in vue and fabricjs and currently working on a complex application which deals with large amount of data. I have multiple canvases with different objects, which may change based on user interaction. All the changes/objects are being stored in the array of objects Demo: https://prkos.csb.app/ I am trying to implement undo/redo in my application. I have a hard time understanding the fabricjs undo/redo approach in the below answer (link) Undo-Redo feature in Fabric.js What I think

问题 I am working on building this specific shape: This kind of looks like a pie chart having 3 leaves with each leaf having 3 set of colours. Each colour represents a specific info about data which will be showing on a popup either by clicking or hovering over it based on JSON . This pie will be placed on the map based on the coordinates(Lat, Long) assigned to it. The small red circle at the center is the place for coordinates(Lat, Long). I might use: CreateJS to generate this kinda CreateJS

问题 I am working on building this specific shape: This kind of looks like a pie chart having 3 leaves with each leaf having 3 set of colours. Each colour represents a specific info about data which will be showing on a popup either by clicking or hovering over it based on JSON . This pie will be placed on the map based on the coordinates(Lat, Long) assigned to it. The small red circle at the center is the place for coordinates(Lat, Long). I might use: CreateJS to generate this kinda CreateJS

问题 I am using leaflet. I can add markers on my map and connecting them with polyLine method. Here is the link to my current code here. As of now, the way code is working is, you can start from point A and then to point B and then to Point C and so on. So it's a continuous chain of points which are connect with Polyline. What I want is I want to give an option to the user like on press escape or having a click option on div. I want user to break this chain and let him start over adding markers on

问题 from tkinter import Tk, Canvas, Frame, BOTH from tkinter import * from tkinter import Tk #Welcome screen root = Tk() root.configure(bg = "steel blue") canvas = Canvas(root, bg = "steel blue", highlightthickness = 0) canvas.config(width = 350, height = 250) #canvas.config(width = root.winfo_screenwidth(), height = root.winfo_screenheight() ) canvas.pack() #Making of the round rectangle class Rectangle: def round_rectangle(x1, y1, x2, y2, radius=25, **kwargs): points = [x1+radius, y1, x1+radius

问题 from tkinter import Tk, Canvas, Frame, BOTH from tkinter import * from tkinter import Tk #Welcome screen root = Tk() root.configure(bg = "steel blue") canvas = Canvas(root, bg = "steel blue", highlightthickness = 0) canvas.config(width = 350, height = 250) #canvas.config(width = root.winfo_screenwidth(), height = root.winfo_screenheight() ) canvas.pack() #Making of the round rectangle class Rectangle: def round_rectangle(x1, y1, x2, y2, radius=25, **kwargs): points = [x1+radius, y1, x1+radius

问题 How to disable right click in canvas in ReactJS. Here is what I tried which is still not working: let Canvas = <canvas onContextMenu={(e)=> {e.preventDefault(); return false;}} height={500} width={500} ref="canvas"/>; A warning is also shown in browser console. Warning: Returning false from an event handler is deprecated and will be ignored in a future release. Instead, manually call e.stopPropagation() or e.preventDefault(), as appropriate. EDIT: Yes it did stop the right click functionality