Last active
October 7, 2022 01:37
-
-
Save tomgp/18a6adf32aeafd1f6cc706ec4478e2a8 to your computer and use it in GitHub Desktop.
2d Slider
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
| <html> | |
| <head> | |
| <style> | |
| body{ | |
| font-family: sans-serif; | |
| } | |
| svg{ | |
| border: 1px solid black; | |
| cursor: move; | |
| } | |
| </style> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"> | |
| </script> | |
| </head> | |
| <body> | |
| <h1>2D slider</h1> | |
| <svg width="300" height="300"> | |
| </svg> | |
| <p> | |
| values: [<span id="valueX">0</span>, <span id="valueY">0</span>] | |
| </p> | |
| </body> | |
| <script> | |
| function main(){ | |
| const xScale = d3.scaleLinear() | |
| .domain([-5 , 5]) | |
| .range([0, 300]); | |
| const yScale = d3.scaleLinear() | |
| .domain([-5 , 5]) | |
| .range([0, 300]); | |
| const mySlider = makeSlider(xScale, yScale, {snapToInteger: true}); | |
| mySlider.event.on('change', function(a){ | |
| const join = d3.select('svg') | |
| .selectAll('.handle') | |
| .data([this]); | |
| join.enter() | |
| .append('circle') | |
| .style('pointer-events', 'none') | |
| .attr('class', d=>'handle') | |
| .attr('r', 20) | |
| .attr('cx', d=>d.x) | |
| .attr('cy', d=>d.y); | |
| join | |
| .attr('cx', d=>d.x) | |
| .attr('cy', d=>d.y); | |
| d3.select('#valueX') | |
| .text(this.valueX); | |
| d3.select('#valueY') | |
| .text(this.valueY); | |
| }) | |
| d3.select('svg') | |
| .call(mySlider); | |
| } | |
| const makeSlider = (xScale, yScale, options) => { | |
| let dragging = false; | |
| const slider = (parent)=>{ | |
| parent.append('rect') | |
| .attr('x', xScale.range()[0]) | |
| .attr('y', yScale.range()[0]) | |
| .attr('width', xScale.range()[1] - xScale.range()[0]) | |
| .attr('height', yScale.range()[1] - yScale.range()[0]) | |
| .attr('fill-opacity', 0.1); | |
| parent.on('mousedown', function(){ | |
| dragging = true; | |
| dispatchLocation(d3.mouse(this)); | |
| }) | |
| parent.on('mousemove', function(){ | |
| if(dragging){ | |
| dispatchLocation(d3.mouse(this)); | |
| } | |
| }); | |
| parent.on('mouseout',function(){ | |
| dragging = false; | |
| }); | |
| parent.on('mouseup', function(){ | |
| dragging = false; | |
| dispatchLocation(d3.mouse(this), true); | |
| }) | |
| }; | |
| slider.event = d3.dispatch("change"); | |
| function dispatchLocation(position, snap = false) { | |
| let valueX = xScale.invert(position[0]); | |
| let valueY = yScale.invert(position[1]); | |
| if (options.snapToInteger){ | |
| valueY = Math.round(valueY); | |
| valueX = Math.round(valueX); | |
| }; | |
| if(snap){ | |
| position[0] = xScale(valueX); | |
| position[1] = yScale(valueY); | |
| } | |
| slider.event.call('change', { | |
| x: position[0], | |
| y: position[1], | |
| valueX, | |
| valueY, | |
| }); | |
| } | |
| return slider; | |
| } | |
| window.onload = main; | |
| </script> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment