canvas | 易学教程

Automatically Moving Shape? Python 3.5 Tkinter

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问题 In python, I am currently making a 'game' using tkinter, but it has decided not to work. What I am trying to do is have one rectangle movable by the mouse, and the other rectangle that moves up and down continuously without the player doing anything. Here is my code: from tkinter import * import time root = Tk() root.title("Game") root.geometry("800x800") def motion(): canvas.delete(ALL) a = canvas.create_rectangle(event.x-50, event.y-50, event.x+50, event.y+50, fill='red') def motion2(): b =

16、canvas性能优化建议

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 在离屏canvas上预渲染相似的图形或重复的对象如果你发现你的在每一帧里有好多复杂的画图运算，请考虑创建一个离屏canvas，将图像在这个画布上画一次（或者每当图像改变的时候画一次），然后在每帧上画出视线以外的这个画布 eg：创建离屏canvas var offCanvas = document.createElement("canvas"); offCanvas.width=400; offCanvas.height=400; var offContext = offCanvas.getContext("2d"); ....... 详细有道笔记链接>> 来源： oschina 链接： https://my.oschina.net/u/3698702/blog/1844958

Security error“ code: ”1000 on Firefox with Canvas.toDataURL

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问题 I've got error like jQuery and Canvas.toDataURL Some user told that might run it on server but I run it on my server not local and still got this 'Security error" code: "1000' error. Security error" code: "1000 [Break On This Error] data: 'raw='+canvas.toDataURL("image/png", ""), 回答1: oh I've found solution just change toDataURL('image/png', '') to toDataURL() and it run correctly 来源： https://stackoverflow.com/questions/4984431/security-error-code-1000-on-firefox-with-canvas-todataurl

期末测试javaweb 考勤系统前端

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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <% Object message = request.getAttribute("message"); if(message!=null && !"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%} %> <div align="center"> <h1 style="color: black;">员工信息录入</h1> <a href="chenggong.jsp">返回主页</a> <form action="servlet1?method=add" method="post" onsubmit="return check()"> <div class="a"> 工号<input type="text" id="id" name=

erase an object from canvas

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问题 I am trying to develop an application and i want the sprites to erase once they reach the end. I am using arraylist to handle my sprites on a canvas. I want the sprites to erase themselves from the canvas and from the arraylist once their x<0 (outside of the canvas) Please help me asap. Thanks This is my code so far for the erase command: for(Sprite sprite : rockSprites){ sprite.x -=10; if (Rect.intersects(sprite.dst, die)) { rockSprites.remove(this); currentAmountOfSprites--; try { Thread

How do I use if isType() for each object on a canvas with fabric js?

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问题 I am trying to show certain attributes for each object on a canvas, but I am having a difficult time writing the code to do so. E.G. I want the code below to identify the difference between a shape, text, and image objects and show attributes based off the type. Attributes to console.log: for each object on canavas check to see if - Image then URL (source) and scale <= I am having a difficult time showing the source and name of the image. Text then font family, font size, color, scale Shape

HTML5 canvas style height vs attribute height

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问题 I am currently learning how to use HTML5 new elements and I stumbled upon a frustrating issue with all graphic functions such as fillRect() and drawImage(). I was setting the widgth and height with style="width: 75px;height: 10px;" instead of width="200" height="100" The result being that the graphics would not be the proper scale ever. My question is, why does it make a difference? There is something I obviously do not understand about it all. Thank you 回答1: I know that at least in JSF

Animate HTML5 Canvas - Event Listeners firing more than once?

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问题 So I am incredibly new to javascript (and coding in general), and I have managed to make an incredibly basic HTML5 canvas in Animate CC. Only problem is, when I move back to the previous frame the buttons repeat themselves. The flow: Frame 1 - Console Message Button & Next Frame Button Frame 2 - Previous Frame Button When moving back to the previous frame, the buttons fire twice (i.e. the console log message fires twice). If I repeat the process and move to the next frame and back again for a

Tkinter moving balls program creating 4 balls instead of 2

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问题 I have created a program that made a ball move around a canvas and bounce of the edge of the canvas. This worked very well so I tried to add another ball but instead of creating 2 balls it created 4, 2 of the balls move and the other two stay still. This is the code: #imports from tkinter import * import random from random import randint #Creating random x and y for the balls to move along x = random.randint(1,10) y = random.randint(1,10) print(x, " Ball 1y") print(y, " Ball 1x") x0 = random

Javascript Canvas Get images pixel data

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问题 I have a two part question about javascript canvas: Part 1: I have a .jpg in the same file as my html document. I was wondering if there was a simple way of getting a pixel's color in that file without having to use context.getImageData(). Part 2: (If part 1 is too complex to be useful.) If I directly copy the code from this site: W3 schools getImageData() into an html file on my desktop, and add an image named img_the_scream.jpg to my desktop, then run it I get this error: Unable to get