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address ChartsOrg#4033 draw half pie chart more accurate (ChartsOrg#4266
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* resolve ChartsOrg#4033. when it's half pie and width is larger than height, draw bigger pie chart.

* use enum orientation for widthLarger
merge with master and solve conficts

* fix macOS error, move extension to Platform+CoreGraphics
liuxuan30 authored and mosaic-engineering committed Apr 17, 2020

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MaxymVlasov Maksym Vlasov
1 parent 3096d61 commit 9a943fa
Showing 2 changed files with 105 additions and 7 deletions.
97 changes: 90 additions & 7 deletions Source/Charts/Charts/PieChartView.swift
Original file line number Diff line number Diff line change
@@ -128,6 +128,26 @@ open class PieChartView: PieRadarChartViewBase

drawMarkers(context: context)
}

/// if width is larger than height
private var widthLarger: Bool
{
return _viewPortHandler.contentRect.orientation == .landscape
}

/// adjusted radius. Use diameter when it's half pie and width is larger
private var adjustedRadius: CGFloat
{
return maxAngle <= 180 && widthLarger ? diameter : diameter / 2.0
}

/// true centerOffsets considering half pie & width is larger
private func adjustedCenterOffsets() -> CGPoint
{
var c = self.centerOffsets
c.y = maxAngle <= 180 && widthLarger ? c.y + adjustedRadius / 2 : c.y
return c
}

internal override func calculateOffsets()
{
@@ -138,25 +158,88 @@ open class PieChartView: PieRadarChartViewBase
{
return
}

let radius = adjustedRadius

let radius = diameter / 2.0

let c = self.centerOffsets
let c = adjustedCenterOffsets()

let shift = (data as? PieChartData)?.dataSet?.selectionShift ?? 0.0

// create the circle box that will contain the pie-chart (the bounds of the pie-chart)
_circleBox.origin.x = (c.x - radius) + shift
_circleBox.origin.y = (c.y - radius) + shift
_circleBox.size.width = diameter - shift * 2.0
_circleBox.size.height = diameter - shift * 2.0
_circleBox.size.width = radius * 2 - shift * 2.0
_circleBox.size.height = radius * 2 - shift * 2.0

}

internal override func calcMinMax()
{
calcAngles()
}


@objc open override func angleForPoint(x: CGFloat, y: CGFloat) -> CGFloat
{
let c = adjustedCenterOffsets()

let tx = Double(x - c.x)
let ty = Double(y - c.y)
let length = sqrt(tx * tx + ty * ty)
let r = acos(ty / length)

var angle = r.RAD2DEG

if x > c.x
{
angle = 360.0 - angle
}

// add 90° because chart starts EAST
angle = angle + 90.0

// neutralize overflow
if angle > 360.0
{
angle = angle - 360.0
}

return CGFloat(angle)
}

/// - Returns: The distance of a certain point on the chart to the center of the chart.
@objc open override func distanceToCenter(x: CGFloat, y: CGFloat) -> CGFloat
{
let c = adjustedCenterOffsets()

var dist = CGFloat(0.0)

var xDist = CGFloat(0.0)
var yDist = CGFloat(0.0)

if x > c.x
{
xDist = x - c.x
}
else
{
xDist = c.x - x
}

if y > c.y
{
yDist = y - c.y
}
else
{
yDist = c.y - y
}

// pythagoras
dist = sqrt(pow(xDist, 2.0) + pow(yDist, 2.0))

return dist
}

open override func getMarkerPosition(highlight: Highlight) -> CGPoint
{
let center = self.centerCircleBox
15 changes: 15 additions & 0 deletions Source/Charts/Utils/Platform+Graphics.swift
Original file line number Diff line number Diff line change
@@ -9,6 +9,21 @@
// https://github.com/danielgindi/Charts
//

enum Orientation
{
case portrait, landscape
}

extension CGSize
{
var orientation: Orientation { return width > height ? .landscape : .portrait }
}

extension CGRect
{
var orientation: Orientation { size.orientation }
}

// MARK: - UIKit
#if canImport(UIKit)
import UIKit

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