Canvas draw svg

A JavaScript library to visualize JSON as tree diagrams (flowhcharts). Supports nested objects, arrays, and custom styles for clear data representation. DemoDownload Drawflow is a JavaScript library to dynamically generate a pretty flowchart via drag and drop. DemoDownload A standalone JavaScript library for creating flowcharts & relationship diagrams using SVG and plain JavaScript. DemoDownload js2flowchart is a pure JavaScript library used to dynamically render JS code flowchart diagrams using SVG. DemoDownload A Pure CSS library to render a Process Flow Diagram illustrating the relationships between nodes defined in nested HTML lists. DemoDownload diagramflowjs is a JavaScript library to draw an interactive, editable flowchart representing workflows, decisions, complex process, and much more. DemoDownload jsdragblocks is a JavaScript to visualize the relationship between two block elements by creating directional arrows between nodes via drag and drop. DemoDownload Pinker.js is a vanilla JavaScript library which renders a canvas based flow chart from plain text to represents a workflow, process, or decisions. DemoDownload flowcharty is a JavaScript library that makes uses of d3.js to dynamically generate SVG flowchart to represent your algorithm, workflow or process. DemoDownload flowjs is a JavaScript library built with CreateJS that allows you to render dynamic, animated flow charts using html5 canvas API. DemoDownload

For the tree based problem that I am currently trying to solve, one of the first perquisites was to get better at Recursion, the next thing to work out was, how do I draw shapes and lines on an HTML page i.e. SVG drawings on web. In this post, I will talk about how I used Raphael.js on web pages.So prior to this my only experience with drawing on an HTML page was a simple badly presented snake game that I had created using the canvas. Anyway for this little project I decided to look around for some libraries that would allow me to draw some shapes and I found a couple of libraries such as Raphel.js and D3.js that would let me draw SVG shapes on a web page. After very briefly investigating them, it seemed that Raphaeljs would be a better fit for my problem and hence I began my SVG drawing journey with Raphael.Now when I think about this problem, I can think of it as a sequential list of little sub-problems that I need to individually solve before I can build my great grand tree drawing solution. This is a slightly larger problem and hence it will be spread out over a few posts. Anyway below is a break of all the sub-problemsProblemSVG drawings on web Find a library that lets you draw shapes Draw some basic shapes and lines with the library. Add some user interactivity by making the shapes drag-able across the drawing area. Connect the shapes by drawing lines between them and ensure that the connections are maintained even when the shapes are dragged. Draw a relatively large tree and ensure the nodes do not overlap. Polish the product by adding, the ability to edit the text in the shapes, or perhaps let

Vue-d3-network on Vue 3 (alpha)Vue component to graph networks using d3-forceWarningThis fork has been created to make the original package compatible with Vue 3.Part of the fork has been thoroughly tested and is in active usein production of a Nuxt 3 project.But only the SVG graph with touch support & nodes selection work without fail!The screenshot feature has not been tested, neither was the canvas!Nor any of the tests have been updated!Linter fails (event though it shouldn't) - no time has been spent on it.This is the result of us having to ship a Nuxt 2 to Nuxt 3 upgrade on a deadline.The rest of this Readme is the original one from the Vue 2 version.DemoDemoFeaturesSVG renderCanvas renderLinks and nodes selectionsvg canvas shared styles via cssScreenshots, export as svg or png (svg renderer), export as png (canvas renderer)Touch supportInstallationUsagefiddlecodePen">d3-network :net-nodes="nodes" :net-links="links" :options="options" />import D3Network from 'vue-d3-network' components: { D3Network }">style src="vue-d3-network/dist/vue-d3-network.css">style>Or: import source component from: 'vue-d3-network/src/vue-d3-network.vue'And install devDependencies. (d3-force, stylus and pug)See: package.json)Propsnet-nodes: Array of node objectsnet-links: Array of link objectsselection : Object, links and nodes selectedlinks: Object with node.ids as keys, node objects as valuesnodes: Object with link.ids as keys, links objects as valuesnodeSym: String, node sprite svg docnodeCb: Function(node) -> node, node formatterlinkCb: Function(link) -> link, node link formattersimCb: Function(sim) -> sim, d3 simulation formattercustomForces: Object: { [d3Function]:args }options:canvas: Boolean, render as canvas, false = svgsize: Object, graph size. Default: container sizew: Numberh: Numberoffset: Object, graph center offsetx: Numbery: Numberforce: Numberforces Object:Center: Boolean, use d3.forceCenterX: strength, use d3.forceXY: strength, use d3.forceYManyBody: Boolean, use d3.forceManyBody, takes the negative value of 'force' optionLink: Boolean, use d3.forceLinknodeSize: Number, node radius | size in pxlinkWidth: Number, link thickness in pxnodeLabels: Boolean, show nodes nameslinkLabels: Boolean, show links namesfontSize: Number, for node labels, pxstrLinks: Boolean, draw links as rect linesresizeListener:Boolean, defaults: true ,add listener to window.resize eventnoNodes: Boolean, no render nodescanvasStyles: ObjectEventsnode-click: fired when click on node, emits (event,node-object)link-click: fired when click on link, emits (event, link-object)screen-shot: fired when screenshot creation is done, emits (error)MethodsscreenShot (name, bgColor, toSVG, svgAllCss), all arguments are optionalname: file namebgColor: CSS color, png background colortoSVG: Boolean, (svg renderer)

This text provides an overview of the HTML5 canvas basic usage. The overview is split into two parts: Declaring an HTML5 canvas element. Drawing graphics on the canvas element.Declaring a Canvas Element First, let's see how to declare a canvas element in an HTML page: HTML5 Canvas not supported The code above declares a single canvas element with width set to 500, height set to 150, and style set to a 1 pixel border with color #cccccc. The text inside the canvas element is ignored, if the browser supports the HTML5 canvas element. If the HTML5 canvas element is not supported, the text will probably be displayed as ordinary text by the browser. You should put the canvas HTML code in your page at the location where you want the canvas to be visible. Just like any other HTML element (e.g. a div element).Drawing Graphics on a Canvas Element Graphics drawn on an HTML5 canvas is drawn in immediate mode. Immediate mode means, that as soon as you have drawn a shape on the canvas, the canvas no longer knows anything about that shape. The shape is visible, but you cannot manipulate that shape individually. It is like a real canvas for a painting. Once painted, all you have left is color pigments / pixels. This is contrary to SVG, where you can manipulate the shapes individually, and have the whole diagram redrawn. In HTML5 you will have to redraw everything yourself, if you want to change the drawn figure. Drawing graphics on an HTML5 canvas element is done using JavaScript, following these steps: Wait for the page to be fully loaded. Obtain a reference to the canvas element. Obtain a 2D context from the canvas element. Draw graphics using the draw functions of 2D context. Here is a simple code example that shows the above steps: // 1. wait for the page to be fully loaded. window.onload = function() { drawExamples(); } function drawExamples(){ // 2. Obtain a reference to the canvas element. var canvas = document.getElementById("ex1"); // 3. Obtain a 2D context from the canvas element. var context = canvas.getContext("2d"); // 4. Draw graphics. context.fillStyle = "#ff0000"; context.fillRect(10,10, 100,100); } First, an event listener function is attached to the window. This event listener function is executed when the page is loaded. This function calls another function I have defined, called drawExamples(). Second, the drawExamples() function obtains a reference to the canvas element using document.getElementById() function, passing the id of the canvas element, as defined in the declaration of the canvas element. Third, the drawExamples() function obtains a reference to a 2D context from the canvas element, by calling canvas.getContext("2d") on the canvas element obtained earlier. Fourth, the drawExamples() function calls various drawing functions on the 2D context object, which results in graphics being drawn on the canvas. Here is how the code looks when executed: HTML5 Canvas not supported

It work:/** @type {import('next').NextConfig} */const nextConfig = { webpack: (config) => { config.externals = [...config.externals, { canvas: 'canvas' }]; // required to make Konva & react-konva work return config; },};module.exports = nextConfig;Usage with React ContextNote: this section may be not relevant, because this issue was fixed in [email protected]. So context should work by default.Due to a known issue with React, Contexts are not accessible by children of the react-konva Stage component. If you need to subscribe to a context from within the Stage, you need to "bridge" the context by creating a Provider as a child of the Stage. For more info, see this discussion and this react-redux demo. Here is an example of bridging the context (live demo):import React, { Component } from 'react';import Konva from 'konva';import { render } from 'react-dom';import { Stage, Layer, Rect } from 'react-konva';const ThemeContext = React.createContext('red');const ThemedRect = () => { const value = React.useContext(ThemeContext); return ( Rect x={20} y={50} width={100} height={100} fill={value} shadowBlur={10} /> );};const Canvas = () => { return ( ThemeContext.Consumer> {(value) => ( Stage width={window.innerWidth} height={window.innerHeight}> ThemeContext.Provider value={value}> Layer> ThemedRect /> Layer> ThemeContext.Provider> Stage> )} ThemeContext.Consumer> );};class App extends Component { render() { return ( ThemeContext.Provider value="blue"> Canvas /> ThemeContext.Provider> ); }}Comparisonsreact-konva vs react-canvasreact-canvas is a completelydifferent react plugin. It allows you to draw DOM-like objects (images, texts)on canvas element in very performant way. It is NOT about drawing graphics, butreact-konva is exactly for drawing complex graphics on element fromReact.react-konva vs react-artreact-art allows you to draw graphics ona page. It also supports SVG for output. But it has no support of events ofshapes.react-konva vs vanilla canvasVanilla canvas is faster because when you use react-konva you have two layers of abstractions. Konva framework is on top of canvas and React is on top of Konva.Depending on the use case this approach can be slow.The purpose of react-konva is to reduce the complexity of the application and use well-known declarative way for drawing on canvas.Note: you can find a lot of demos and examples of using Konva there: Really, just go there and take a look what Konva can do for you. You will be able to do the same with react-konva too.