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BalloonMarker.swift
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BalloonMarker.swift
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//
// BalloonMarker.swift
// ChartsDemo
//
// 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 DGCharts
#if canImport(UIKit)
import UIKit
#endif
open class BalloonMarker: MarkerImage
{
@objc open var color: UIColor
@objc open var arrowSize = CGSize(width: 15, height: 11)
@objc open var font: UIFont
@objc open var textColor: UIColor
@objc open var insets: UIEdgeInsets
@objc open var minimumSize = CGSize()
fileprivate var label: String?
fileprivate var _labelSize: CGSize = CGSize()
fileprivate var _paragraphStyle: NSMutableParagraphStyle?
fileprivate var _drawAttributes = [NSAttributedString.Key : Any]()
@objc public init(color: UIColor, font: UIFont, textColor: UIColor, insets: UIEdgeInsets)
{
self.color = color
self.font = font
self.textColor = textColor
self.insets = insets
_paragraphStyle = NSParagraphStyle.default.mutableCopy() as? NSMutableParagraphStyle
_paragraphStyle?.alignment = .center
super.init()
}
open override func offsetForDrawing(atPoint point: CGPoint) -> CGPoint
{
var offset = self.offset
var size = self.size
if size.width == 0.0 && image != nil
{
size.width = image!.size.width
}
if size.height == 0.0 && image != nil
{
size.height = image!.size.height
}
let width = size.width
let height = size.height
let padding: CGFloat = 8.0
var origin = point
origin.x -= width / 2
origin.y -= height
if origin.x + offset.x < 0.0
{
offset.x = -origin.x + padding
}
else if let chart = chartView,
origin.x + width + offset.x > chart.bounds.size.width
{
offset.x = chart.bounds.size.width - origin.x - width - padding
}
if origin.y + offset.y < 0
{
offset.y = height + padding;
}
else if let chart = chartView,
origin.y + height + offset.y > chart.bounds.size.height
{
offset.y = chart.bounds.size.height - origin.y - height - padding
}
return offset
}
open override func draw(context: CGContext, point: CGPoint)
{
guard let label = label else { return }
let offset = self.offsetForDrawing(atPoint: point)
let size = self.size
var rect = CGRect(
origin: CGPoint(
x: point.x + offset.x,
y: point.y + offset.y),
size: size)
rect.origin.x -= size.width / 2.0
rect.origin.y -= size.height
context.saveGState()
context.setFillColor(color.cgColor)
if offset.y > 0
{
context.beginPath()
context.move(to: CGPoint(
x: rect.origin.x,
y: rect.origin.y + arrowSize.height))
context.addLine(to: CGPoint(
x: rect.origin.x + (rect.size.width - arrowSize.width) / 2.0,
y: rect.origin.y + arrowSize.height))
//arrow vertex
context.addLine(to: CGPoint(
x: point.x,
y: point.y))
context.addLine(to: CGPoint(
x: rect.origin.x + (rect.size.width + arrowSize.width) / 2.0,
y: rect.origin.y + arrowSize.height))
context.addLine(to: CGPoint(
x: rect.origin.x + rect.size.width,
y: rect.origin.y + arrowSize.height))
context.addLine(to: CGPoint(
x: rect.origin.x + rect.size.width,
y: rect.origin.y + rect.size.height))
context.addLine(to: CGPoint(
x: rect.origin.x,
y: rect.origin.y + rect.size.height))
context.addLine(to: CGPoint(
x: rect.origin.x,
y: rect.origin.y + arrowSize.height))
context.fillPath()
}
else
{
context.beginPath()
context.move(to: CGPoint(
x: rect.origin.x,
y: rect.origin.y))
context.addLine(to: CGPoint(
x: rect.origin.x + rect.size.width,
y: rect.origin.y))
context.addLine(to: CGPoint(
x: rect.origin.x + rect.size.width,
y: rect.origin.y + rect.size.height - arrowSize.height))
context.addLine(to: CGPoint(
x: rect.origin.x + (rect.size.width + arrowSize.width) / 2.0,
y: rect.origin.y + rect.size.height - arrowSize.height))
//arrow vertex
context.addLine(to: CGPoint(
x: point.x,
y: point.y))
context.addLine(to: CGPoint(
x: rect.origin.x + (rect.size.width - arrowSize.width) / 2.0,
y: rect.origin.y + rect.size.height - arrowSize.height))
context.addLine(to: CGPoint(
x: rect.origin.x,
y: rect.origin.y + rect.size.height - arrowSize.height))
context.addLine(to: CGPoint(
x: rect.origin.x,
y: rect.origin.y))
context.fillPath()
}
if offset.y > 0 {
rect.origin.y += self.insets.top + arrowSize.height
} else {
rect.origin.y += self.insets.top
}
rect.size.height -= self.insets.top + self.insets.bottom
UIGraphicsPushContext(context)
label.draw(in: rect, withAttributes: _drawAttributes)
UIGraphicsPopContext()
context.restoreGState()
}
open override func refreshContent(entry: ChartDataEntry, highlight: Highlight)
{
setLabel(String(entry.y))
}
@objc open func setLabel(_ newLabel: String)
{
label = newLabel
_drawAttributes.removeAll()
_drawAttributes[.font] = self.font
_drawAttributes[.paragraphStyle] = _paragraphStyle
_drawAttributes[.foregroundColor] = self.textColor
_labelSize = label?.size(withAttributes: _drawAttributes) ?? CGSize.zero
var size = CGSize()
size.width = _labelSize.width + self.insets.left + self.insets.right
size.height = _labelSize.height + self.insets.top + self.insets.bottom
size.width = max(minimumSize.width, size.width)
size.height = max(minimumSize.height, size.height)
self.size = size
}
}