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ScatterChartRenderer.swift
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ScatterChartRenderer.swift
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//
// ScatterChartRenderer.swift
// Charts
//
// Copyright 2015 Daniel Cohen Gindi & Philipp Jahoda
// A port of MPAndroidChart for iOS
// Licensed under Apache License 2.0
//
// https://github.com/danielgindi/Charts
//
import Foundation
import CoreGraphics
#if !os(OSX)
import UIKit
#endif
open class ScatterChartRenderer: LineScatterCandleRadarRenderer
{
open weak var dataProvider: ScatterChartDataProvider?
public init(dataProvider: ScatterChartDataProvider?, animator: Animator?, viewPortHandler: ViewPortHandler?)
{
super.init(animator: animator, viewPortHandler: viewPortHandler)
self.dataProvider = dataProvider
}
open override func drawData(context: CGContext)
{
guard let scatterData = dataProvider?.scatterData else { return }
for i in 0 ..< scatterData.dataSetCount
{
guard let set = scatterData.getDataSetByIndex(i) else { continue }
if set.isVisible
{
if !(set is IScatterChartDataSet)
{
fatalError("Datasets for ScatterChartRenderer must conform to IScatterChartDataSet")
}
drawDataSet(context: context, dataSet: set as! IScatterChartDataSet)
}
}
}
fileprivate var _lineSegments = [CGPoint](repeating: CGPoint(), count: 2)
open func drawDataSet(context: CGContext, dataSet: IScatterChartDataSet)
{
guard
let dataProvider = dataProvider,
let animator = animator,
let viewPortHandler = self.viewPortHandler
else { return }
let trans = dataProvider.getTransformer(forAxis: dataSet.axisDependency)
let phaseY = animator.phaseY
let entryCount = dataSet.entryCount
var point = CGPoint()
let valueToPixelMatrix = trans.valueToPixelMatrix
if let renderer = dataSet.shapeRenderer
{
context.saveGState()
for j in 0 ..< Int(min(ceil(Double(entryCount) * animator.phaseX), Double(entryCount)))
{
guard let e = dataSet.entryForIndex(j) else { continue }
point.x = CGFloat(e.x)
point.y = CGFloat(e.y * phaseY)
point = point.applying(valueToPixelMatrix)
if !viewPortHandler.isInBoundsRight(point.x)
{
break
}
if !viewPortHandler.isInBoundsLeft(point.x) ||
!viewPortHandler.isInBoundsY(point.y)
{
continue
}
renderer.renderShape(context: context, dataSet: dataSet, viewPortHandler: viewPortHandler, point: point, color: dataSet.color(atIndex: j))
}
context.restoreGState()
}
else
{
print("There's no IShapeRenderer specified for ScatterDataSet", terminator: "\n")
}
}
open override func drawValues(context: CGContext)
{
guard
let dataProvider = dataProvider,
let scatterData = dataProvider.scatterData,
let animator = animator,
let viewPortHandler = self.viewPortHandler
else { return }
// if values are drawn
if isDrawingValuesAllowed(dataProvider: dataProvider)
{
guard let dataSets = scatterData.dataSets as? [IScatterChartDataSet] else { return }
let phaseY = animator.phaseY
var pt = CGPoint()
for i in 0 ..< scatterData.dataSetCount
{
let dataSet = dataSets[i]
if !shouldDrawValues(forDataSet: dataSet)
{
continue
}
let valueFont = dataSet.valueFont
guard let formatter = dataSet.valueFormatter else { continue }
let trans = dataProvider.getTransformer(forAxis: dataSet.axisDependency)
let valueToPixelMatrix = trans.valueToPixelMatrix
let shapeSize = dataSet.scatterShapeSize
let lineHeight = valueFont.lineHeight
_xBounds.set(chart: dataProvider, dataSet: dataSet, animator: animator)
for j in stride(from: _xBounds.min, through: _xBounds.range + _xBounds.min, by: 1)
{
guard let e = dataSet.entryForIndex(j) else { break }
pt.x = CGFloat(e.x)
pt.y = CGFloat(e.y * phaseY)
pt = pt.applying(valueToPixelMatrix)
if (!viewPortHandler.isInBoundsRight(pt.x))
{
break
}
// make sure the lines don't do shitty things outside bounds
if (!viewPortHandler.isInBoundsLeft(pt.x)
|| !viewPortHandler.isInBoundsY(pt.y))
{
continue
}
let text = formatter.stringForValue(
e.y,
entry: e,
dataSetIndex: i,
viewPortHandler: viewPortHandler)
ChartUtils.drawText(
context: context,
text: text,
point: CGPoint(
x: pt.x,
y: pt.y - shapeSize - lineHeight),
align: .center,
attributes: [NSFontAttributeName: valueFont, NSForegroundColorAttributeName: dataSet.valueTextColorAt(j)]
)
}
}
}
}
open override func drawExtras(context: CGContext)
{
}
open override func drawHighlighted(context: CGContext, indices: [Highlight])
{
guard
let dataProvider = dataProvider,
let scatterData = dataProvider.scatterData,
let animator = animator
else { return }
context.saveGState()
for high in indices
{
guard
let set = scatterData.getDataSetByIndex(high.dataSetIndex) as? IScatterChartDataSet,
set.isHighlightEnabled
else { continue }
let entries = set.entriesForXValue(high.x)
for entry in entries
{
if entry.y != high.y { continue }
if !isInBoundsX(entry: entry, dataSet: set) { continue }
context.setStrokeColor(set.highlightColor.cgColor)
context.setLineWidth(set.highlightLineWidth)
if set.highlightLineDashLengths != nil
{
context.setLineDash(phase: set.highlightLineDashPhase, lengths: set.highlightLineDashLengths!)
}
else
{
context.setLineDash(phase: 0.0, lengths: [])
}
let x = entry.x // get the x-position
let y = entry.y * Double(animator.phaseY)
let trans = dataProvider.getTransformer(forAxis: set.axisDependency)
let pt = trans.pixelForValues(x: x, y: y)
high.setDraw(pt: pt)
// draw the lines
drawHighlightLines(context: context, point: pt, set: set)
}
}
context.restoreGState()
}
}