Playing with paths to create bracket and elbow connectors (1 + 2) for annotations.
TODO: Rewrite to use SVG path strings and add labels with line lengths.
Last active
September 1, 2017 16:14
-
-
Save tlfrd/3dedf0369f7d67843be17961550218d9 to your computer and use it in GitHub Desktop.
Elbows (and Brackets)
This file contains hidden or 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
| license: mit |
This file contains hidden or 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.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| .connector-b { | |
| stroke: red; | |
| stroke-width: 1px; | |
| stroke-dasharray: 5,5; | |
| } | |
| .connector-a { | |
| stroke: blue; | |
| stroke-width: 1px; | |
| stroke-dasharray: 5,5; | |
| } | |
| .connector-45 { | |
| stroke: black; | |
| stroke-width: 2px; | |
| } | |
| .connector-90 { | |
| stroke: black; | |
| stroke-width: 2px; | |
| } | |
| .connector-line { | |
| opacity: 1; | |
| stroke: #bbb; | |
| stroke-width: 1px; | |
| stroke-dasharray: 5,5; | |
| } | |
| circle { | |
| fill: white; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| var config = { | |
| radius: 10 | |
| }; | |
| var data = [{x: 300, y: 200, colour: "cyan"}, {x: 500, y: 300, colour: "magenta"}]; | |
| var dragbehaviour = d3.drag() | |
| .on("drag", dragged); | |
| var points = svg.selectAll("circle") | |
| .data(data) | |
| .enter().append("circle") | |
| .attr("cx", d => d.x) | |
| .attr("cy", d => d.y) | |
| .attr("r", config.radius) | |
| .style("fill", d => d.colour) | |
| .call(dragbehaviour); | |
| var connector = svg.append("line") | |
| .attr("class", "connector-line") | |
| .attr("x1", data[0].x) | |
| .attr("y1", data[0].y) | |
| .attr("x2", data[1].x) | |
| .attr("y2", data[1].y); | |
| var connectorB = svg.append("line") | |
| .attr("class", "connector-b") | |
| .attr("x1", data[0].x) | |
| .attr("y1", data[0].y) | |
| .attr("x2", data[0].x) | |
| .attr("y2", data[0].y + calculateLine1().b); | |
| var connectorA = svg.append("line") | |
| .attr("class", "connector-a") | |
| .attr("x1", data[0].x) | |
| .attr("y1", data[0].y + calculateLine1().b) | |
| .attr("x2", data[0].x + calculateLine1().c) | |
| .attr("y2", data[0].y + calculateLine1().b); | |
| var connector45 = svg.append("line") | |
| .attr("class", "connector-45") | |
| .attr("x1", data[0].x) | |
| .attr("y1", data[0].y) | |
| .attr("x2", data[0].x + calculateLine1().a) | |
| .attr("y2", data[0].y + calculateLine1().b); | |
| var connector90 = svg.append("line") | |
| .attr("class", "connector-90") | |
| .attr("x1", data[0].x + calculateLine1().a) | |
| .attr("y1", data[0].y + calculateLine1().b) | |
| .attr("x2", data[1].x) | |
| .attr("y2", data[1].y); | |
| points.raise(); | |
| function dragged(d) { | |
| d3.select(this) | |
| .attr("cx", d.x = Math.max(0, Math.min(width, d3.event.x))) | |
| .attr("cy", d.y = Math.max(0, Math.min(height, d3.event.y))); | |
| connector | |
| .attr("x1", data[0].x) | |
| .attr("y1", data[0].y) | |
| .attr("x2", data[1].x) | |
| .attr("y2", data[1].y); | |
| connectorB | |
| .attr("x1", data[0].x) | |
| .attr("y1", data[0].y) | |
| .attr("x2", data[0].x) | |
| .attr("y2", data[0].y + calculateLine1().b); | |
| connectorA | |
| .attr("x1", data[0].x) | |
| .attr("y1", data[0].y + calculateLine1().b) | |
| .attr("x2", data[0].x + calculateLine1().c) | |
| .attr("y2", data[0].y + calculateLine1().b); | |
| connector45 | |
| .attr("x1", data[0].x) | |
| .attr("y1", data[0].y) | |
| .attr("x2", data[0].x + calculateLine1().a) | |
| .attr("y2", data[0].y + calculateLine1().b); | |
| connector90 | |
| .attr("x1", data[0].x + calculateLine1().a) | |
| .attr("y1", data[0].y + calculateLine1().b) | |
| .attr("x2", data[1].x) | |
| .attr("y2", data[1].y); | |
| } | |
| // Rewrite to use | |
| function calculateLine1() { | |
| var b = data[1].y - data[0].y; | |
| var a = Math.abs(Math.tan(Math.PI / 4) * b); | |
| var c = data[1].x - data[0].x; | |
| var h = Math.sqrt(Math.pow(b, 2) + Math.pow(c, 2)); | |
| var ab = Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2)); | |
| /* | |
| Check if the line between the two points is less than | |
| the hypotenuse between a and b | |
| */ | |
| if (h < ab) { | |
| a = data[1].x - data[0].x; | |
| b = Math.abs(Math.tan(Math.PI / 4) * a); | |
| if ((data[1].y - data[0].y) < 0) { | |
| b = -b;; | |
| } | |
| } else { | |
| if ((data[1].x - data[0].x) < 0) { | |
| a = -a; | |
| } | |
| } | |
| return {a: a, b: b, c: c}; | |
| } | |
| </script> | |
| </body> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment