PDF_Office/PDF Office/PDF Master/KMClass/KMPDFViewController/EditTool/Background/KMBackgroundModel.swift

//
//  KMBackgroundModel.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2022/12/23.
//

import Cocoa

@objcMembers class KMBackgroundModel: NSObject {
    
    var type: CPDFBackgroundType = .color
    var color: NSColor?
    var imagePath: String?
    var rotation: CGFloat = 0.0
    var opacity: CGFloat = 1.0
    var isScale: Bool = false
    var scale: CGFloat = 1.0
    var verticalMode: Int = 1
    var verticalSpace: CGFloat = 0.0
    var horizontalMode: Int = 1
    var horizontalSpace: CGFloat = 0.0
    
    var backgroundID: String = ""
    var name: String = ""
    
    override init() {
        super.init()
        
        self.type = .color

        self.color = NSColor(red: 247/255, green: 247/255, blue: 247/255, alpha: 1)
        self.imagePath = nil
        self.rotation = 0
        self.opacity = 1
        self.isScale = false
        self.scale = 1
        self.verticalMode = 1
        self.horizontalMode = 1
        self.verticalSpace = 0
        self.horizontalSpace = 0
        self.backgroundID = NSString.tagString()
        self.name = "Background0"
        
    }
     
    func modelPreviewImage() -> NSImage? {
        if let resultPath = KMBackgroundManager.defaultManager.kBackgroundImageFolder?.stringByAppendingPathComponent((self.backgroundID + ".png")) {
            if let image = NSImage(contentsOfFile: resultPath) {
                return image
            }
        }
        return nil
    }
    
    func image() -> NSImage? {
        if let imagePath = self.imagePath {
            if let image = NSImage(contentsOfFile: imagePath) {
                return image
            }
        }
        return nil
    }
    
    //更新预览图
    func updatePreviewImage() {
        if let resultPath = KMBackgroundManager.defaultManager.kBackgroundImageFolder?.stringByAppendingPathComponent((self.backgroundID + ".png")) {   
            let image = self.drawImage(rect: CGRectMake(0, 0, 136, 181))
            
            try?image.pngData()?.write(to: URL(fileURLWithPath: resultPath))
        }
    }
    
    func drawImage(rect: CGRect) -> NSImage {
        let drawRect: CGRect = NSMakeRect(0, 0, 128, 160)

        let image = NSImage(size: drawRect.size)
        image.lockFocus()
        NSGraphicsContext.current?.imageInterpolation = .high

        NSGraphicsContext.saveGraphicsState()
        NSColor.clear.set()
        drawRect.fill()
        NSGraphicsContext.restoreGraphicsState()

        let context: CGContext = NSGraphicsContext.current!.cgContext
        let _: NSSize = NSMakeSize(drawRect.size.width, drawRect.size.height)
        if (context != nil) {
            NSGraphicsContext.current = NSGraphicsContext(cgContext: context, flipped: false)
        }

        NSGraphicsContext.saveGraphicsState()
        if (self.type == .color) {
            var size = drawRect.size
            size.width *= self.scale
            size.height *= self.scale
            
            let radian = CGFloat(self.rotation) * (Double.pi/180.0)
            let t: CGAffineTransform =  CGAffineTransform(rotationAngle: radian)
            var rect = NSMakeRect(0, 0, size.width, size.height).applying(t)
            
            if (self.verticalMode == 0) {
                rect.origin.y = drawRect.size.height-rect.size.height
            } else if (self.verticalMode == 1) {
                rect.origin.y = (drawRect.size.height-rect.size.height) * 0.5
            } else if (self.verticalMode == 2) {
                rect.origin.y = 0
            }
            
            if (self.horizontalMode == 0) {
                rect.origin.x = 0
            } else if (self.horizontalMode == 1) {
                rect.origin.x = (drawRect.size.width-rect.size.width) * 0.5
            } else if (self.horizontalMode == 2) {
                rect.origin.x = drawRect.size.width-rect.size.width
            }
            
            rect.origin.x += self.horizontalSpace
            rect.origin.y += self.verticalSpace
            
            let contextCenter = NSPoint(x: rect.midX, y: rect.midY)
            context.translateBy(x: contextCenter.x, y: contextCenter.y)
            context.rotate(by: radian)
            context.translateBy(x: -contextCenter.x, y: -contextCenter.y)
         
            var red: CGFloat = 0
            var green: CGFloat = 0
            var blue: CGFloat = 0
            var alpha: CGFloat = 0
            
            let oldStrokeColor = self.color?.usingColorSpace(NSColorSpace.deviceRGB)
            oldStrokeColor?.getRed(&red, green: &green, blue: &blue, alpha: &alpha)

            context.setFillColor(red: red, green: green, blue: blue, alpha: self.opacity);
            context.fill(NSMakeRect(rect.origin.x+(rect.size.width-size.width)/2.0,
                                                  rect.origin.y+(rect.size.height-size.height)/2.0,
                                                  size.width, size.height));
        } else if (self.type == .image) {
            var size: NSSize = CGSizeZero
            if let image = self.image() {
                size = image.size
            }
            size.width *= self.scale
            size.height *= self.scale
            
            var wScale = size.width / drawRect.size.width
            var hScale = size.height / drawRect.size.height
            
            var scale = max(wScale, hScale)
            if (scale > 1) {
                size.width /= scale
                size.height /= scale
            }
            
            let radian = CGFloat(self.rotation) * (Double.pi/180.0)
            let t: CGAffineTransform =  CGAffineTransform(rotationAngle: radian)
            var rect = NSMakeRect(0, 0, size.width, size.height).applying(t)
            
            if (self.verticalMode == 0) {
                rect.origin.y = drawRect.size.height-rect.size.height
            } else if (self.verticalMode == 1) {
                rect.origin.y = (drawRect.size.height-rect.size.height) * 0.5
            } else if (self.verticalMode == 2) {
                rect.origin.y = 0
            }
            
            if (self.horizontalMode == 0) {
                rect.origin.x = 0
            } else if (self.horizontalMode == 1) {
                rect.origin.x = (drawRect.size.width-rect.size.width) * 0.5
            } else if (self.horizontalMode == 2) {
                rect.origin.x = drawRect.size.width-rect.size.width
            }
            
            rect.origin.x += self.horizontalSpace
            rect.origin.y += self.verticalSpace
            
            let contextCenter = NSPoint(x: rect.midX, y: rect.midY)
            context.translateBy(x: contextCenter.x, y: contextCenter.y)
            context.rotate(by: radian)
            context.translateBy(x: -contextCenter.x, y: -contextCenter.y)
            
            let finalRect = NSMakeRect(rect.origin.x+(rect.size.width-size.width)/2.0,
                                       rect.origin.y+(rect.size.height-size.height)/2.0,
                                       size.width, size.height)
            image.draw(in: NSMakeRect(rect.origin.x+(rect.size.width-size.width)/2.0,
                                       rect.origin.y+(rect.size.height-size.height)/2.0,
                                       size.width, size.height), from: NSZeroRect, operation: .sourceOver, fraction: self.opacity)
        }

        NSGraphicsContext.restoreGraphicsState()
        NSGraphicsContext.current?.imageInterpolation = .default
        image.unlockFocus()

        return image
    }
    
}