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svg canvas clip-path
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| license: mit |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| <style> | |
| .box { | |
| display: flex; | |
| } | |
| svg, | |
| canvas { | |
| border: 1px solid gray; | |
| margin-right: 1em; | |
| cursor: crosshair; | |
| display: block; | |
| } | |
| circle { | |
| fill: rgba(250,0,0,0.3); | |
| } | |
| text { | |
| fill: tomato; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="box"> | |
| <svg width="400" height="300"> | |
| <defs> | |
| <clipPath id="cp"> | |
| <circle cx="200" cy="150" r="80" /> | |
| </clipPath> | |
| </defs> | |
| </svg> | |
| <canvas width="400" height="300"></canvas> | |
| </div> | |
| <script> | |
| var clip = {x: 200, y: 150, r: 80}, | |
| svg = d3.select("svg"), | |
| circle = svg.select("defs circle"), | |
| canvas = d3.select("canvas"), | |
| ctx = canvas.node().getContext("2d"), | |
| w = 400, h = 300; | |
| var data = d3.range(80).map(function (d) { | |
| return { | |
| x: Math.floor(Math.random() * 400), | |
| y: Math.floor(Math.random() * 300), | |
| r: Math.floor(Math.random() * 10 + 3) | |
| } | |
| }); | |
| function onMouseMove () { | |
| var m = d3.mouse(this); | |
| clip.x = m[0], clip.y = m[1]; | |
| circle.attr("cx", m[0]).attr("cy", m[1]); | |
| cavnasDraw(); | |
| } | |
| svg.on("mousemove", onMouseMove); | |
| canvas.on("mousemove", onMouseMove); | |
| var g = svg.append("g") | |
| .attr("clip-path", "url(#cp)"); | |
| g.append("rect") | |
| .attr("width", 400) | |
| .attr("height", 300) | |
| .attr("fill", "rgba(0,0,0,0.1)"); | |
| g.selectAll("circle") | |
| .data(data) | |
| .enter() | |
| .append("circle") | |
| .attr("cx", d => d.x) | |
| .attr("cy", d => d.y) | |
| .attr("r", d => d.r); | |
| g.append("text") | |
| .attr("x", 20) | |
| .attr("y", 150) | |
| .attr("font-size", 50) | |
| .text("SVG Clip Path"); | |
| function cavnasDraw () { | |
| ctx.save(); | |
| ctx.clearRect(0, 0, w, h); | |
| ctx.beginPath(); | |
| ctx.arc(clip.x, clip.y, clip.r, 0, Math.PI * 2, false); | |
| ctx.clip(); | |
| ctx.fillStyle = "rgba(0,0,0,0.1)"; | |
| ctx.fillRect(0, 0, w, h); | |
| var i = 0, length = data.length, c = data[i]; | |
| ctx.fillStyle = "rgba(250,0,0,0.4)"; | |
| while (i < length) { | |
| ctx.beginPath(); | |
| ctx.arc(c.x, c.y, c.r, 0, Math.PI * 2, false); | |
| i++; | |
| c = data[i]; | |
| ctx.fill(); | |
| } | |
| ctx.fillStyle = "tomato"; | |
| ctx.font = "50px serif"; | |
| ctx.fillText("SVG Clip Path", 20, 150); | |
| ctx.restore(); | |
| } | |
| cavnasDraw(); | |
| </script> | |
| </body> |
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