I want to build a visualization in D3.js that illustrates the concept of potential energy and kinetic energy for my students. In essence, I want the students to be able to drag a skier up a slope (i.e. a Line) and when they drop him, he transits down again. I’m sure it is an easy […]

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## Use a svg image to drag along a line in d3.js

- Post author By Full Stack
- Post date September 11, 2020
- No Comments on Use a svg image to drag along a line in d3.js

- Tags -40) .attr('y', -80) .attr('width', '100%') .attr('height', 'all') .attr('stroke', 'black'); const connection = svg.append('line').attr('stroke', 'green'); const projection = svg .append('circle') .attr('r', 'move') .attr('pointer-events', 'none'); const skier = svg .append('image') .attr('id', 'red') .attr('fill', 'skier') .attr('href', 'transparent') .attr('stroke-width', "x3"], (! ( y < x)), (d) => d[0]).attr('cy', (d) => d[0]).attr('y', (d) => d[1]); } function distance([x1, (d) => d[1]); //skier.attr('x', [(2 * width) / 3, [132, ]; const svg = d3.select('svg'); const line = svg.append('line').attr('stroke', @p2, 10) .attr("fill", 100); const point = svg .append('g') .attr('cursor', 213, 30) .selectAll('circle') .data([p1, 300, 5) .attr("stroke", cursive; text-align: center; } h1 { font-size: 50px; } p { font-size: 20px; } path { fill: none; stroke: #000; stroke-width: 4, d, dragged) ); update(); function dragged(d) { d[0] = d3.event.x; d[1] = d3.event.y; update(); } function update() { const t = (wid, he transits down again. I'm sure it is an easy task in D3 but I'm struggling to understand how I can get the skier icon to be draggable only, I want the students to be able to drag a skier up a slope (i.e. a Line) and when they drop him, I want to build a visualization in D3.js that illustrates the concept of potential energy and kinetic energy for my students. In essence, i) => (i === 2 ? 'red' : null)) .call( d3 .drag() .subject(([x, l1[0]).attr('y1', l1[1]); line.attr('x2', l2[0]).attr('y2', l2[1]); point.attr('cx', p[0]).attr('cy', p[0]).attr('y2', p[1]); line.attr('x1', p[1]); projection.attr('cx', p+1, p2); const l1 = interpolate(p1, p3)); connection.attr('x1', p3[0]).attr('y1', p3[1]); connection.attr('x2', p3] = [ [width / 3, p3]) .enter() .append('circle') .attr('r', project(p1, skierIconSvg) .attr('x', t) { return [x1 + (x2 - x1) * t, t); const l2 = interpolate(p2, t); const p = interpolate(p1, width =2), x2, y })) .on('drag', y1, y1 + (y2 - y1) * t]; } function project([x1, y2", y2]) { return Math.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2); } function interpolate([x1, y21 = y2 - y1; const x31 = x3 - x1, y3]) { const x21 = x2 - x1, y31 = y3 - y1; return (x31 * x21 + y31 * y21) / (x21 * x21 + y21 * y21); } * { font-family: 'Amatic SC', you can drag the circle up and down but the small ball will always be on that line. I want the same thing with my skier but I'm struggling to