Implementasi line drawing (multiple lines)
Created
February 26, 2017 16:48
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multi line drawing
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| license: mit | |
| height: 300 | |
| border: no |
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| <!DOCTYPE html> | |
| <!--[if lt IE 7]> <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]--> | |
| <!--[if IE 7]> <html class="no-js lt-ie9 lt-ie8"> <![endif]--> | |
| <!--[if IE 8]> <html class="no-js lt-ie9"> <![endif]--> | |
| <!--[if gt IE 8]><!--> <html class="no-js"> <!--<![endif]--> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
| <title>Multi Line Drawing</title> | |
| <meta name="description" content=""> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| </head> | |
| <body> | |
| <!--[if lt IE 7]> | |
| <p class="browsehappy">You are using an <strong>outdated</strong> browser. Please <a href="#">upgrade your browser</a> to improve your experience.</p> | |
| <![endif]--> | |
| <div id="d3-drawing-area"></div> | |
| <script src="//cdnjs.cloudflare.com/ajax/libs/d3/4.6.0/d3.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/redux/3.6.0/redux.min.js"></script> | |
| <script> | |
| /* ====================== | |
| * definitions | |
| * ======================*/ | |
| // reducers | |
| function drag(state = false, action) { | |
| switch(action.type) { | |
| case 'DRAG_START': | |
| return true; | |
| case 'DRAG_STOP': | |
| return false; | |
| default: | |
| return state; | |
| } | |
| } | |
| function dragStart() { | |
| return { | |
| type: 'DRAG_START' | |
| }; | |
| } | |
| function dragStop() { | |
| return { | |
| type: 'DRAG_STOP' | |
| }; | |
| } | |
| function selectDrag(state) { | |
| return state.drag; | |
| } | |
| function lines(state = [], action) { | |
| switch(action.type) { | |
| case 'LINE_START': | |
| return [ | |
| ...state, | |
| { | |
| p1: action.payload.position | |
| } | |
| ]; | |
| case 'LINE_EXTEND': | |
| var lastLine = state.slice(-1)[0]; | |
| return [ | |
| ...state.slice(0, -1), | |
| Object.assign({}, lastLine, { | |
| p2: action.payload.position | |
| }) | |
| ]; | |
| case 'LINE_STOP': | |
| var lastLine = state.slice(-1)[0]; | |
| if(lastLine.hasOwnProperty('p2')) { | |
| return state; | |
| } else { | |
| return state.slice(0, -1); | |
| } | |
| default: | |
| return state; | |
| } | |
| } | |
| function lineStart(position) { | |
| return { | |
| type: 'LINE_START', | |
| payload: { | |
| position: position | |
| } | |
| }; | |
| } | |
| function lineExtend(position) { | |
| return { | |
| type: 'LINE_EXTEND', | |
| payload: { | |
| position: position | |
| } | |
| }; | |
| } | |
| function lineStop(position) { | |
| return { | |
| type: 'LINE_STOP', | |
| payload: { | |
| position: position | |
| } | |
| }; | |
| } | |
| function selectLines(state) { | |
| return state.lines; | |
| } | |
| // middleware | |
| function logger() { | |
| return function(next) { | |
| return function(action) { | |
| console.log(action.type); | |
| return next(action); | |
| } | |
| } | |
| } | |
| // draw lines | |
| function drawLines(linesData) { | |
| // console.log(linesData) | |
| var lines = svg.selectAll('.line') | |
| .data(linesData, (d,i) => i); // update | |
| lines.exit().remove(); // exit | |
| lines.enter() // enter | |
| .append('line') | |
| .merge(lines) // enter + update | |
| .attr('class', 'line') | |
| .attr('x1', d => d.p1[0]) | |
| .attr('y1', d => d.p1[1]) | |
| .attr('x2', d => d.p2[0]) | |
| .attr('y2', d => d.p2[1]) | |
| .style('stroke', 'blue') | |
| .style('stroke-width', 2); | |
| } | |
| /* ====================== | |
| * main | |
| * ======================*/ | |
| // global store | |
| var reducer = Redux.combineReducers({ | |
| drag: drag, | |
| lines: lines | |
| }); | |
| var store = Redux.createStore(reducer, {}, Redux.applyMiddleware(logger)); | |
| // d3 visualizer | |
| var svg = d3.select('#d3-drawing-area').append('svg') | |
| .attr('width', 300) | |
| .attr('height', 300) | |
| .style('background', 'lightblue'); | |
| // attach event | |
| svg.on('mousedown', function() { | |
| store.dispatch(lineStart(d3.mouse(this))); | |
| store.dispatch(dragStart()); | |
| }); | |
| svg.on('mousemove', function() { | |
| if(selectDrag(store.getState())) { | |
| store.dispatch(lineExtend(d3.mouse(this))); | |
| } | |
| }); | |
| svg.on('mouseup', function() { | |
| store.dispatch(dragStop()); | |
| store.dispatch(lineStop(d3.mouse(this))); | |
| }); | |
| // update d3 on state change | |
| store.subscribe(function() { | |
| console.log('state changed'); | |
| console.log(selectLines(store.getState())); | |
| drawLines( | |
| selectLines(store.getState()) | |
| .filter(line => line.hasOwnProperty('p2')) | |
| ); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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