Iphone画饼图工具类详解

项目中需要画饼图，在此将工具类添出来：
h文件：
[cpp]

#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>

@inte易做图ce CLMView : UIView
{

    float spaceHeight; //高度
    float scaleY ;
    NSArray *titleArr ; //文字
    NSArray *valueArr; //值
    NSArray *colorArr; //颜色
}

@property(nonatomic, assign) float spaceHeight;
@property(nonatomic, assign) float scaleY;
@property(nonatomic, retain) NSArray *titleArr;
@property(nonatomic, retain) NSArray *valueArr;
@property(nonatomic, retain) NSArray *colorArr;

@end

m文件：
[cpp]
#import "CLMView.h"

#define K_PI 3.1415
#define KDGREED(x) ((x) * K_PI * 2)

@implementation CLMView
@synthesize spaceHeight, scaleY;
@synthesize titleArr, valueArr, colorArr;

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        self.backgroundColor = [UIColor colorWithRed:240.0f/255.0f green:1 blue:1 alpha:1.0];

        spaceHeight = 40;
        scaleY = 0.4;


    }
    return self;
}

- (void)drawRect:(CGRect)rect
{
    CGContextRef context = UIGraphicsGetCurrentContext();
    //cgcontextsets

    //抗锯齿
    CGContextSetAllowsAntialiasing(context, TRUE);

// int arr[5] = {20, 15, 35, 85 ,60};

    float sum = 0;


    for(int j=0;j< [valueArr count]; j++)
    {
        sum += [[valueArr objectAtIndex:j] floatValue];
    }


    CGContextMoveToPoint(context, 160, 230);

    float currentangel = 0;

    //饼图
    CGContextSaveGState(context);
    CGContextScaleCTM(context, 1.0, scaleY);

    currentangel = 0;
    for(int i = 0; i< [valueArr count]; i++)
    {

        float startAngle = KDGREED(currentangel);

        currentangel += [[valueArr objectAtIndex:i] floatValue] / sum;
        float endAngle = KDGREED(currentangel);
        //绘制上面的扇形
        CGContextMoveToPoint(context, 160, 230);

        [[colorArr objectAtIndex:i % [valueArr count]] setFill];

        [[UIColor colorWithWhite:1.0 alpha:0.8] setStroke];

        CGContextAddArc(context, 160, 230, 150, startAngle, endAngle, 0);

        CGContextClosePath(context);
        CGContextDrawPath(context, kCGPathFill);



        //绘制侧面
        float starx = cos(startAngle) * 150 +160;
        float stary = sin(startAngle) * 150 + 230;

        float endx = cos(endAngle) * 150 + 160;
        float endy = sin(endAngle) * 150 + 230;

        //float starty1 = stary + spaceHeight;
        float endy1 = endy + spaceHeight;


        if(endAngle < K_PI)
        {

            //绘制厚度
            CGMutablePathRef path = CGPathCreateMutable();
            CGPathMoveToPoint(path, nil, starx, stary);
            CGPathAddArc(path, nil, 160, 230, 150, startAngle, endAngle, 0);
            CGPathAddLineToPoint(path, nil, endx, endy1);

            CGPathAddArc(path, nil, 160, 230 + spaceHeight, 150, endAngle, startAngle, 1);
            CGContextAddPath(context, path);

            [[colorArr objectAtIndex:i % [valueArr count]] setFill];
            [[UIColor colorWithWhite:0.9 alpha:1.0] setStroke];

            CGContextDrawPath(context, kCGPathFill);

            [[UIColor colorWithWhite:0.1 alpha:0.4] setFill];
    &nb

补充：移动开发 , IOS ,