饼图/快速绘图 [英] pie chart/plot in swift

问题描述

我尝试了很多不同的方法来从GitHub添加绘图程序包，使用核心绘图或将Objective-C组合到Swift中，但是在此过程中出现了很多问题，在这一周中，我没有取得成功图表.我真的很沮丧

I've tried so many different ways of add plots package from GitHub or using core plots or combining objective-c into swift, but it appeared so many problems during the process, and during this week I didn't make a successful chart. I'm really depressed.

有人成功地迅速创建了饼图吗?类似的问题似乎没有成功的答案.

Is there anyone who succeed in creating a pie chart in swift? The similar questions seem don't have successful answers.

非常感谢您的帮助！

推荐答案

不要沮丧.您只需添加一个更具体的问题即可获得更多帮助.例如，如果您从头开始并尝试集成来自Github的plots程序包，则必须说出什么程序包，如何尝试将其集成，遇到什么错误等.

Don't be depressed. You just have to add a more specific question to get more help. For example, if you start from scratch and try to integrate a plots package from Github, you have to say what package, how did you try to integrate it, what errors are you getting etc.

但是，使用CoreGraphics功能可以很容易地绘制一个简单的饼图.这是我的代码提供的一点礼物，它以简单的黑白饼图形式绘制了进度值.它只有2个部分，但是您可以从中进行概括

However, drawing a simple pie chart is pretty easy with CoreGraphics functionality. Here is a little gift from my code, this draws progress value as a simple black and white pie chart. It only has 2 sections, but you can generalize from it

@IBDesignable class ProgressPieIcon: UIView {
    @IBInspectable var progress : Double =  0.0 {
        didSet {
            self.setNeedsDisplay()
        }
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder:aDecoder)
        self.contentMode = .Redraw
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.backgroundColor = UIColor.clearColor()
        self.contentMode = .Redraw
    }

    override func drawRect(rect: CGRect) {
        let color = UIColor.blackColor().CGColor
        let lineWidth : CGFloat = 2.0

        // Calculate box with insets
        let margin: CGFloat = lineWidth
        let box0 = CGRectInset(self.bounds, margin, margin)
        let side : CGFloat = min(box0.width, box0.height)
        let box = CGRectMake((self.bounds.width-side)/2, (self.bounds.height-side)/2,side,side)


        let ctx = UIGraphicsGetCurrentContext()

        // Draw outline
        CGContextBeginPath(ctx)
        CGContextSetStrokeColorWithColor(ctx, color)
        CGContextSetLineWidth(ctx, lineWidth)
        CGContextAddEllipseInRect(ctx, box)
        CGContextClosePath(ctx)
        CGContextStrokePath(ctx)

        // Draw arc
        let delta : CGFloat = -CGFloat(M_PI_2)
        let radius : CGFloat = min(box.width, box.height)/2.0

        func prog_to_rad(p: Double) -> CGFloat {
            let rad = CGFloat(p * 2 * M_PI)
            return rad + delta
        }

        func draw_arc(s: CGFloat, e: CGFloat, color: CGColor) {
            CGContextBeginPath(ctx)
            CGContextMoveToPoint(ctx, box.midX, box.midY)
            CGContextSetFillColorWithColor(ctx, color)

            CGContextAddArc(
                ctx,
                box.midX,
                box.midY,
                radius-lineWidth/2,
                s,
                e,
                0)

            CGContextClosePath(ctx)
            CGContextFillPath(ctx)
        }

        if progress > 0 {
            let s = prog_to_rad(0)
            let e = prog_to_rad(min(1.0, progress))
            draw_arc(s, e, color)
        }
   }

这篇关于饼图/快速绘图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！