StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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220 lines
5.1 KiB
220 lines
5.1 KiB
'use strict'
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var orient = require('robust-orientation')
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var vec2 = require('vec2')
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var segment2 = require('segment2')
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var mouseChange = require('mouse-change')
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var segCrosses = require('robust-segment-intersect')
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var fit = require('canvas-fit')
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var createTriangulation = require('../lib/monotone')
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//Create canvas and context
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var canvas = document.createElement('canvas')
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var context = canvas.getContext('2d')
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document.body.appendChild(canvas)
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window.addEventListener('resize', fit(canvas), false)
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function edgeDistance(a, b, c) {
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var p = vec2(c[0], c[1])
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return segment2(vec2(a[0], a[1]), vec2(b[0], b[1])).closestPointTo(p).distance(p)
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}
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var points = []
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var edges = []
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for(var i=0; i<4; ++i) {
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for(var j=0; j<4; ++j) {
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points.push([0.25 + i/10,0.25 + j/10])
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}
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}
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var cells = createTriangulation(points, edges)
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function isValidEdge(a, b) {
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for(var i=0; i<edges.length; ++i) {
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var e = edges[i]
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var p = points[e[0]]
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var q = points[e[1]]
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if( (p === a && q !== b) ||
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(p === b && q !== a) ||
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(q === a && p !== b) ||
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(q === b && p !== a)) {
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continue
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}
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if(segCrosses(a, b, p, q)) {
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return false
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}
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}
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return true
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}
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var lastButtons = 0,
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highlightPoint = -1,
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startPoint = -1,
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highlightEdge = -1,
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activeEdge = null
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mouseChange(canvas, function(buttons, x, y) {
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var lx = x / canvas.width
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var ly = y / canvas.height
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var closestDist = 0.0125
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highlightPoint = -1
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highlightEdge = -1
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for(var i=0; i<points.length; ++i) {
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var p = points[i]
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var d2 = Math.sqrt(Math.pow(lx - p[0], 2) + Math.pow(ly - p[1], 2))
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if(d2 < closestDist) {
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highlightPoint = i
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closestDist = d2
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}
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}
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if(highlightPoint < 0) {
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for(var i=0; i<edges.length; ++i) {
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var e = edges[i]
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var d2 = edgeDistance(points[e[0]], points[e[1]], [lx, ly])
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if(d2 < closestDist) {
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highlightEdge = i
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closestDist = d2
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}
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}
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}
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if(!lastButtons && !!buttons) {
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if(highlightEdge >= 0) {
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edges.splice(highlightEdge, 1)
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cells = createTriangulation(points, edges)
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highlightEdge = -1
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} else if(highlightPoint < 0) {
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points.push([lx, ly])
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cells = createTriangulation(points, edges)
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} else {
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startPoint = highlightPoint
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activeEdge = [ points[highlightPoint], [lx, ly] ]
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}
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} else if(!!lastButtons && !buttons) {
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if(startPoint >= 0) {
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if(highlightPoint === startPoint) {
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points.splice(highlightPoint, 1)
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var nedges = []
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discard_edge:
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for(var i=0; i<edges.length; ++i) {
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var e = edges[i]
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for(var j=0; j<2; ++j) {
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if(e[j] > highlightPoint) {
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e[j] -= 1
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} else if(e[j] === highlightPoint) {
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continue discard_edge
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}
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}
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nedges.push(e)
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}
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edges = nedges
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highlightPoint = -1
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cells = createTriangulation(points, edges)
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} else if(highlightPoint >= 0) {
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if(isValidEdge(points[startPoint], points[highlightPoint])) {
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edges.push([startPoint, highlightPoint])
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cells = createTriangulation(points, edges)
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}
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}
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startPoint = -1
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activeEdge = null
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}
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} else if(!!buttons) {
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if(activeEdge) {
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activeEdge[1] = [lx, ly]
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}
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}
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lastButtons = buttons
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})
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function line(a, b) {
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var x0 = a[0]
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var y0 = a[1]
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var x1 = b[0]
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var y1 = b[1]
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var w = canvas.width
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var h = canvas.height
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context.beginPath()
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context.moveTo(w*x0, h*y0)
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context.lineTo(w*x1, h*y1)
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context.stroke()
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}
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function circle(x, y, r) {
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var w = canvas.width
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var h = canvas.height
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context.beginPath()
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context.moveTo(w*x, y*h)
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context.arc(w*x, h*y, r, 0.0, 2.0*Math.PI)
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context.fill()
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}
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var CW_ARROW = '⟳'
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var CCW_ARROW = '⟲'
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function drawSpiral(a, b, c) {
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var w = canvas.width
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var h = canvas.height
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var x = w * (a[0] + b[0] + c[0]) / 3.0
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var y = h * (a[1] + b[1] + c[1]) / 3.0
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context.font = Math.ceil(Math.min(w, h)*0.025) + 'px Verdana'
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if(orient(a, b, c) > 0) {
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context.fillText(CW_ARROW, x, y)
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} else {
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context.fillText(CCW_ARROW, x, y)
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}
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}
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function draw() {
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requestAnimationFrame(draw)
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var w = canvas.width
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var h = canvas.height
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context.fillStyle = '#fff'
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context.fillRect(0, 0, w, h)
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for(var i=0; i<cells.length; ++i) {
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var f = cells[i]
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var a = points[f[0]]
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var b = points[f[1]]
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var c = points[f[2]]
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var fs = f.slice().sort().join()
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context.fillStyle = '#000'
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context.strokeStyle = '#000'
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line(a, b)
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line(b, c)
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line(c, a)
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drawSpiral(a, b, c)
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}
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for(var i=0; i<edges.length; ++i) {
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var e = edges[i]
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var a = points[e[0]]
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var b = points[e[1]]
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context.strokeStyle = '#0f0'
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line(a, b)
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}
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if(!!activeEdge) {
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context.strokeStyle = '#f00'
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line(activeEdge[0], activeEdge[1])
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} else if(highlightEdge >= 0) {
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var e = edges[highlightEdge]
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context.strokeStyle = '#f00'
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line(points[e[0]], points[e[1]])
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}
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for(var i=0; i<points.length; ++i) {
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var p = points[i]
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if(i === highlightPoint || i === startPoint) {
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context.fillStyle = '#f00'
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} else {
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context.fillStyle = '#000'
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}
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circle(p[0], p[1], 3)
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}
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}
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draw()
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