112 lines
2.7 KiB
JavaScript
112 lines
2.7 KiB
JavaScript
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function drawGraph() {
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let ValA = 0.8;
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let ValB = 0.4;
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let ValC = 0.6;
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createSVGgraphic("#Q1","FeatureA", "FeatureB", "FeatureC", ValA, ValB, ValC);
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createSVGgraphic("#Q2","ConceptA", "ConceptB", "ConceptC", 0.2, 0.8, 0.8);
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}
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function createSVGgraphic(divID,FA,FB,FC,VA,VB,VC) {
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const svg = d3.select(divID);
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const width = +svg.attr("width");
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const height = +svg.attr("height");
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const radius = 150;
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const center = { x: width / 2, y: height / 2 };
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// Define axes with A at the top (rotate -90 degrees)
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const axes = [
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{ name: FA, angle: 0 },
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{ name: FB, angle: 120 },
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{ name: FC, angle: 240 }
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];
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axes.forEach(d => d.angle = (d.angle - 90) * Math.PI / 180);
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// Sample data: [0-1] scale
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const values = [VA, VB, VC];
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// Draw axis lines
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svg.append("g")
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.attr("class", "axis")
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.selectAll("line")
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.data(axes)
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.join("line")
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.attr("x1", center.x)
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.attr("y1", center.y)
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.attr("x2", d => center.x + radius * Math.cos(d.angle))
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.attr("y2", d => center.y + radius * Math.sin(d.angle));
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// Draw grid rings (polygons)
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const levels = 5;
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for (let i = 1; i <= levels; i++) {
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const r = (radius / levels) * i;
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const points = axes.map(d => {
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return [
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center.x + r * Math.cos(d.angle),
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center.y + r * Math.sin(d.angle)
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];
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});
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svg.append("polygon")
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.attr("class", "grid")
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.attr("points", points.map(p => p.join(",")).join(" "));
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}
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// Draw axis ticks
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const tickLength = 5;
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axes.forEach(axis => {
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for (let i = 1; i <= levels; i++) {
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const r = (radius / levels) * i;
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const angle = axis.angle;
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const x1 = center.x + r * Math.cos(angle);
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const y1 = center.y + r * Math.sin(angle);
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// Perpendicular tick
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const perpAngle = angle + Math.PI / 2;
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const x2 = x1 + tickLength * Math.cos(perpAngle);
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const y2 = y1 + tickLength * Math.sin(perpAngle);
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svg.append("line")
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.attr("x1", x1)
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.attr("y1", y1)
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.attr("x2", x2)
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.attr("y2", y2)
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.attr("class", "tick");
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}
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});
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// Convert values to coordinates
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const valuePoints = axes.map((d, i) => {
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const r = radius * values[i];
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return [
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center.x + r * Math.cos(d.angle),
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center.y + r * Math.sin(d.angle)
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];
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});
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// Draw data area
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svg.append("polygon")
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.attr("class", "area")
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.attr("points", valuePoints.map(p => p.join(",")).join(" "))
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// Add axis labels
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svg.selectAll(".label")
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.data(axes)
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.join("text")
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.attr("class", "label")
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.attr("x", d => center.x + (radius + 20) * Math.cos(d.angle))
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.attr("y", (d,i) => {
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if (i === 0) { //adjust for 1st access, rather than using d.name
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return center.y + (radius + 20) * Math.sin(d.angle)
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} else
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return center.y + (radius + 20 + 30) * Math.sin(d.angle)
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})
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.text(d => d.name);
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}
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