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//
// Fill.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
@objc(ChartFillType)
public enum FillType: Int
{
case empty
case color
case linearGradient
case radialGradient
case image
case tiledImage
case layer
}
@objc(ChartFill)
open class Fill: NSObject
{
private var _type: FillType = FillType.empty
private var _color: CGColor?
private var _gradient: CGGradient?
private var _gradientAngle: CGFloat = 0.0
private var _gradientStartOffsetPercent: CGPoint = CGPoint()
private var _gradientStartRadiusPercent: CGFloat = 0.0
private var _gradientEndOffsetPercent: CGPoint = CGPoint()
private var _gradientEndRadiusPercent: CGFloat = 0.0
private var _image: CGImage?
private var _layer: CGLayer?
// MARK: Properties
@objc open var type: FillType
{
return _type
}
@objc open var color: CGColor?
{
return _color
}
@objc open var gradient: CGGradient?
{
return _gradient
}
@objc open var gradientAngle: CGFloat
{
return _gradientAngle
}
@objc open var gradientStartOffsetPercent: CGPoint
{
return _gradientStartOffsetPercent
}
@objc open var gradientStartRadiusPercent: CGFloat
{
return _gradientStartRadiusPercent
}
@objc open var gradientEndOffsetPercent: CGPoint
{
return _gradientEndOffsetPercent
}
@objc open var gradientEndRadiusPercent: CGFloat
{
return _gradientEndRadiusPercent
}
@objc open var image: CGImage?
{
return _image
}
@objc open var layer: CGLayer?
{
return _layer
}
// MARK: Constructors
public override init()
{
}
@objc public init(CGColor: CGColor)
{
_type = .color
_color = CGColor
}
@objc public convenience init(color: NSUIColor)
{
self.init(CGColor: color.cgColor)
}
@objc public init(linearGradient: CGGradient, angle: CGFloat)
{
_type = .linearGradient
_gradient = linearGradient
_gradientAngle = angle
}
@objc public init(
radialGradient: CGGradient,
startOffsetPercent: CGPoint,
startRadiusPercent: CGFloat,
endOffsetPercent: CGPoint,
endRadiusPercent: CGFloat
)
{
_type = .radialGradient
_gradient = radialGradient
_gradientStartOffsetPercent = startOffsetPercent
_gradientStartRadiusPercent = startRadiusPercent
_gradientEndOffsetPercent = endOffsetPercent
_gradientEndRadiusPercent = endRadiusPercent
}
@objc public convenience init(radialGradient: CGGradient)
{
self.init(
radialGradient: radialGradient,
startOffsetPercent: CGPoint(x: 0.0, y: 0.0),
startRadiusPercent: 0.0,
endOffsetPercent: CGPoint(x: 0.0, y: 0.0),
endRadiusPercent: 1.0
)
}
@objc public init(CGImage: CGImage, tiled: Bool)
{
_type = tiled ? .tiledImage : .image
_image = CGImage
}
@objc public convenience init(image: NSUIImage, tiled: Bool)
{
self.init(CGImage: image.cgImage!, tiled: tiled)
}
@objc public convenience init(CGImage: CGImage)
{
self.init(CGImage: CGImage, tiled: false)
}
@objc public convenience init(image: NSUIImage)
{
self.init(image: image, tiled: false)
}
@objc public init(CGLayer: CGLayer)
{
_type = .layer
_layer = CGLayer
}
// MARK: Constructors
@objc open class func fillWithCGColor(_ CGColor: CGColor) -> Fill
{
return Fill(CGColor: CGColor)
}
@objc open class func fillWithColor(_ color: NSUIColor) -> Fill
{
return Fill(color: color)
}
@objc open class func fillWithLinearGradient(
_ linearGradient: CGGradient,
angle: CGFloat) -> Fill
{
return Fill(linearGradient: linearGradient, angle: angle)
}
@objc open class func fillWithRadialGradient(
_ radialGradient: CGGradient,
startOffsetPercent: CGPoint,
startRadiusPercent: CGFloat,
endOffsetPercent: CGPoint,
endRadiusPercent: CGFloat
) -> Fill
{
return Fill(
radialGradient: radialGradient,
startOffsetPercent: startOffsetPercent,
startRadiusPercent: startRadiusPercent,
endOffsetPercent: endOffsetPercent,
endRadiusPercent: endRadiusPercent
)
}
@objc open class func fillWithRadialGradient(_ radialGradient: CGGradient) -> Fill
{
return Fill(radialGradient: radialGradient)
}
@objc open class func fillWithCGImage(_ CGImage: CGImage, tiled: Bool) -> Fill
{
return Fill(CGImage: CGImage, tiled: tiled)
}
@objc open class func fillWithImage(_ image: NSUIImage, tiled: Bool) -> Fill
{
return Fill(image: image, tiled: tiled)
}
@objc open class func fillWithCGImage(_ CGImage: CGImage) -> Fill
{
return Fill(CGImage: CGImage)
}
@objc open class func fillWithImage(_ image: NSUIImage) -> Fill
{
return Fill(image: image)
}
@objc open class func fillWithCGLayer(_ CGLayer: CGLayer) -> Fill
{
return Fill(CGLayer: CGLayer)
}
// MARK: Drawing code
/// Draws the provided path in filled mode with the provided area
@objc open func fillPath(
context: CGContext,
rect: CGRect)
{
let fillType = _type
if fillType == .empty
{
return
}
context.saveGState()
switch fillType
{
case .color:
context.setFillColor(_color!)
context.fillPath()
case .image:
context.clip()
context.draw(_image!, in: rect)
case .tiledImage:
context.clip()
context.draw(_image!, in: rect, byTiling: true)
case .layer:
context.clip()
context.draw(_layer!, in: rect)
case .linearGradient:
let radians = (360.0 - _gradientAngle).DEG2RAD
let centerPoint = CGPoint(x: rect.midX, y: rect.midY)
let xAngleDelta = cos(radians) * rect.width / 2.0
let yAngleDelta = sin(radians) * rect.height / 2.0
let startPoint = CGPoint(
x: centerPoint.x - xAngleDelta,
y: centerPoint.y - yAngleDelta
)
let endPoint = CGPoint(
x: centerPoint.x + xAngleDelta,
y: centerPoint.y + yAngleDelta
)
context.clip()
context.drawLinearGradient(_gradient!,
start: startPoint,
end: endPoint,
options: [.drawsAfterEndLocation, .drawsBeforeStartLocation]
)
case .radialGradient:
let centerPoint = CGPoint(x: rect.midX, y: rect.midY)
let radius = max(rect.width, rect.height) / 2.0
context.clip()
context.drawRadialGradient(_gradient!,
startCenter: CGPoint(
x: centerPoint.x + rect.width * _gradientStartOffsetPercent.x,
y: centerPoint.y + rect.height * _gradientStartOffsetPercent.y
),
startRadius: radius * _gradientStartRadiusPercent,
endCenter: CGPoint(
x: centerPoint.x + rect.width * _gradientEndOffsetPercent.x,
y: centerPoint.y + rect.height * _gradientEndOffsetPercent.y
),
endRadius: radius * _gradientEndRadiusPercent,
options: [.drawsAfterEndLocation, .drawsBeforeStartLocation]
)
case .empty:
break
}
context.restoreGState()
}
}