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forked from tomshanley's block: matrix inside circle
forked from tomshanley's block: matrix inside circle
Created
February 10, 2020 17:18
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matrix inside circle
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { | |
| margin: 50; | |
| } | |
| circle { | |
| fill: none; | |
| stroke: black; | |
| stroke-width: 2px; | |
| } | |
| rect { | |
| stroke: black; | |
| stroke-width: 1px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="chart"></div> | |
| <div id="count"></div> | |
| <script> | |
| console.clear() | |
| let radius = 200 | |
| let diameter = radius * 2 | |
| let margin = 20 | |
| let squareWidth = 18 | |
| let n = Math.floor(diameter / squareWidth) | |
| let offset = (diameter - (n * squareWidth)) / 2 | |
| let width = diameter | |
| let height = width | |
| let numberOfSquaresInsideCircle = 0 | |
| // let percent = 40 | |
| let svg = d3.select("#chart").append("svg") | |
| .attr("width", width + (margin * 2)) | |
| .attr("height", height + (margin * 2)) | |
| let g = svg.append("g") | |
| .attr("transform", "translate(" + margin + ", " + margin + ")") | |
| let circle = g.append("circle") | |
| .attr("cx", radius) | |
| .attr("cy", radius) | |
| .attr("r", radius) | |
| .style("fill", "grey") | |
| for (var i = 0; i < n; i++) { | |
| for (var j = 0; j < n; j++) { | |
| let x = (j * squareWidth) + offset | |
| let y = (i * squareWidth) + offset | |
| if(isSquareOutsideCircle(x, y, squareWidth, radius)) { | |
| } else { | |
| numberOfSquaresInsideCircle = numberOfSquaresInsideCircle + 1 | |
| g.append("rect") | |
| .attr("x", x) | |
| .attr("y", y) | |
| .attr("width", squareWidth) | |
| .attr("height", squareWidth) | |
| .style("fill", "white") | |
| .attr("id", "cell-" + i + "-" + j) | |
| } | |
| } | |
| } | |
| /*let squares = d3.selectAll("rect") | |
| .style("fill", function(d, i){ | |
| return ((numberOfSquaresInsideCircle - i)/numberOfSquaresInsideCircle) * 100 < percent | |
| ? "orange" | |
| : "white" | |
| })*/ | |
| d3.select("#count") | |
| .text(numberOfSquaresInsideCircle) | |
| function isSquareOutsideCircle(squareX, squareY, squareW, circleR) { | |
| if (isPointOutsideCircle(squareX, squareY, circleR)) { | |
| return true | |
| } else if (isPointOutsideCircle((squareX + squareW), squareY, circleR)) { | |
| return true | |
| } else if (isPointOutsideCircle(squareX, (squareY + squareW), circleR)) { | |
| return true | |
| } else if (isPointOutsideCircle((squareX + squareW), (squareY + squareW), circleR)) { | |
| return true | |
| } else { | |
| return false | |
| } | |
| } | |
| function isPointOutsideCircle(x, y, r) { | |
| return hypothenuese(Math.abs(r - x), Math.abs(r - y)) > r ? true : false | |
| } | |
| function hypothenuese(side1, side2) { | |
| return Math.sqrt((side1 * side1) + (side2 * side2)) | |
| } | |
| </script> | |
| </body> |
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