在坐标系中绘制数据曲线

作者: jiangamh | 来源:发表于2016-02-18 16:21 被阅读307次

在坐标系中绘制数据曲线2
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昨晚睡觉时qq聊天中看见别人的截图，截图内容为健康类app运动数据的展示截图，在坐标系中展示曲线数据，感觉很炫，今天自己动手写了一下，JDataCurveView封装了一下。
JDataCurveView头文件如下：

@interface JDataCurveView : UIView

//如果显示数据需经常刷新数据,值该值为yes，否则no
@property(nonatomic,assign)BOOL isDynamicRefreshData;
//Y坐标轴名称
@property(nonatomic,copy)NSString* yCoordinateName;
//Y坐标轴的单位名称
@property(nonatomic,copy)NSString* yCoordinateUnitName;
//X坐标轴名称
@property(nonatomic,copy)NSString* xCoordinateName;
//Y坐标轴的单位名称
@property(nonatomic,copy)NSString* xCoordinateUnitName;

//曲线条颜色
@property(nonatomic,strong)UIColor *curveColor;
//单位名称显示颜色
@property(nonatomic,strong)UIColor* unitNameColor;
//单位数据显示的颜色
@property(nonatomic,strong)UIColor* unitDataDisplayColor;
//坐标轴颜色
@property(nonatomic,strong)UIColor* coordinateColor;

//y轴显示数据
@property(nonatomic,strong)NSArray *yDisplayData;
//x轴显示数据
@property(nonatomic,strong)NSArray *xDisplayData;
//中间曲线数据
@property(nonatomic,strong)NSArray *dataArrary;

//是否填充曲线下部分内容
@property(nonatomic,assign)BOOL isNeedFill;
//填充曲线下部分内容颜色值
@property(nonatomic,strong)UIColor *fillColor;

@property(nonatomic,assign)CGFloat xMaxData;
@property(nonatomic,assign)CGFloat yMaxData;

@property(nonatomic,assign)BOOL isNeedDisplayXData;
@property(nonatomic,assign)BOOL isNeedDisplayYData;

+(JDataCurveView*)dataCurveView;
-(void)resetDataArray:(NSArray *)dataArrary;

@end

JDataCurveView源文件，具体如下：

#import "JDataCurveView.h"

@interface JDataCurveView ()

@property(nonatomic,strong)UIImage *coordinateBackgroundImg;
@property(nonatomic,strong)UIImage *dataDispalyImg;

@property(nonatomic,strong)UIImageView *coordinateBackgroundImgView;
@property(nonatomic,strong)UIImageView *dataDispalyImgView;

@property(nonatomic,strong)dispatch_queue_t queue;

@end

@implementation JDataCurveView

+(JDataCurveView*)dataCurveView
{
    return [[JDataCurveView alloc] init];
}

-(id)init
{
    if (self = [super init]) {
        [self setupUI];
    }
    return self;
}

-(void)setupUI
{
    _isNeedDisplayXData = YES;
    _isNeedDisplayYData = YES;
    _coordinateBackgroundImgView = [[UIImageView alloc] init];
    [self addSubview:_coordinateBackgroundImgView];
    
    _dataDispalyImgView = [[UIImageView alloc] init];
    [self addSubview:_dataDispalyImgView];
}

-(void)layoutSubviews
{
    _coordinateBackgroundImgView.frame = self.bounds;
    _dataDispalyImgView.frame = CGRectMake(40 + 1, 35 + 10, self.bounds.size.width - 30 - 41 - 10, self.bounds.size.height - 50 - 35 - 1 - 10);
}

drawRect绘画代码如下,采取后台线程绘制方法，避免阻塞主线程：

-(void)drawRect:(CGRect)rect
{
    if (!_coordinateBackgroundImg) {
        [self drawCoordinateBackgroundImg];
    }
    if (_isDynamicRefreshData) {
        [self drawDataImg];
    }
    else
    {
        if (!_dataDispalyImg) {
            [self drawDataImg];
        }
    }
}

drawCoordinateBackgroundImg的具体实现：

-(void)drawCoordinateBackgroundImg
{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        
        UIGraphicsBeginImageContext(self.bounds.size);
        CGContextRef context = UIGraphicsGetCurrentContext();
        
        if (!_unitNameColor) {
            _unitNameColor = [UIColor grayColor];
        }
        CGContextSetRGBFillColor(context, 1, 0, 0, 1);

        if (!_yCoordinateName) {
            _yCoordinateName = @"Y轴";
        }
        
        NSString *yCoordinateName = [NSString stringWithFormat:@"%@:%@",_yCoordinateName,_yCoordinateUnitName?_yCoordinateUnitName:@""];
        [yCoordinateName drawAtPoint:CGPointMake(10,10) withAttributes:@{NSForegroundColorAttributeName:_unitNameColor}];
        
        if (!_xCoordinateName) {
            _xCoordinateName = @"X轴";
        }
        NSString *xCoordinateName = [NSString stringWithFormat:@"%@:%@",_xCoordinateName,_xCoordinateUnitName?_xCoordinateUnitName:@""];
        [xCoordinateName drawAtPoint:CGPointMake(self.bounds.size.width - 30 - 25, self.bounds.size.height - 20) withAttributes:@{NSForegroundColorAttributeName:_unitNameColor}];
        
        
        if (!_coordinateColor) {
            _coordinateColor = [UIColor grayColor];
        }
        
        CGContextSetStrokeColorWithColor(context, _coordinateColor.CGColor);
        UIBezierPath *bezierPath = [UIBezierPath bezierPath];
        //画坐标系
        [bezierPath moveToPoint:CGPointMake(40, 35)];
        [bezierPath addLineToPoint:CGPointMake(40, self.bounds.size.height - 50)];
        [bezierPath addLineToPoint:CGPointMake(self.bounds.size.width - 30, self.bounds.size.height - 50)];
        
        if (!_unitDataDisplayColor) {
            _unitDataDisplayColor = [UIColor whiteColor];
        }
        //画Y坐标刻度
        if (_yDisplayData && _yDisplayData.count > 0) {
            
            CGFloat yMaxData = [_yDisplayData[_yDisplayData.count - 1] floatValue];
            CGFloat yMaxLength = self.bounds.size.height - 35 - 50 - 10;
            CGFloat orgY = self.bounds.size.height - 50;
            
            for (NSNumber *yNum in _yDisplayData) {
                CGFloat length = yMaxLength * ([yNum floatValue] / yMaxData);
                if ([yNum floatValue] != 0) {
                    CGContextMoveToPoint(context, 40, orgY - length);
                    CGContextAddLineToPoint(context, 45, orgY - length);
                }
                
                if (_isNeedDisplayYData) {
                    NSString *dataStr = [NSString stringWithFormat:@"%@",yNum];
                    [dataStr drawAtPoint:CGPointMake(10, orgY - length - 10) withAttributes:@{NSForegroundColorAttributeName:_unitDataDisplayColor}];
                }
               
            }
        }
       
        //画X坐标刻度
        if (_xDisplayData && _xDisplayData.count > 0) {
            
            CGFloat xMaxData = [_xDisplayData[_xDisplayData.count - 1] floatValue];
            CGFloat xMaxLength = self.bounds.size.width - 40 - 30 - 10;
            CGFloat orgX = 40;
            
            for (NSNumber *xNum in _xDisplayData) {
                CGFloat length = xMaxLength * ([xNum floatValue] / xMaxData);
                if ([xNum floatValue] != 0) {
                    CGContextMoveToPoint(context,orgX + length, self.bounds.size.height - 50);
                    CGContextAddLineToPoint(context, orgX + length, self.bounds.size.height - 50 - 5);
                }
                
                if (_isNeedDisplayXData) {
                    NSString *dataStr = [NSString stringWithFormat:@"%@",xNum];
                    [dataStr drawAtPoint:CGPointMake(orgX + length - 8, self.bounds.size.height - 50 + 5) withAttributes:@{NSForegroundColorAttributeName:_unitDataDisplayColor}];
                }
            }
        }

        CGContextAddPath(context, bezierPath.CGPath);
        CGContextStrokePath(context);
        _coordinateBackgroundImg  = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        
        dispatch_async(dispatch_get_main_queue(), ^{
            _coordinateBackgroundImgView.image = _coordinateBackgroundImg;
        });
        
    });
}

drawDataImg实现：

-(void)drawDataImg
{
    if (!_dataArrary || _dataArrary.count <=0) {
        return;
    }
    
    dispatch_queue_t queue = NULL;

    if (_isDynamicRefreshData) {
        //创建串行队列，保证一张图片一张图片的显示，不乱

  //创建串行队列
        if(!_queue)
        {
            _queue = dispatch_queue_create("com.draw.dataImg", DISPATCH_QUEUE_SERIAL);

        }
        queue = _queue;
    }
    else
    {
        queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    }
    
    dispatch_async(queue, ^{
        
        UIGraphicsBeginImageContext(_dataDispalyImgView.frame.size);
        CGContextRef context = UIGraphicsGetCurrentContext();
        UIBezierPath *bezierPath = [UIBezierPath bezierPath];
        
        CGPoint point = [_dataArrary[0] CGPointValue];
        
        CGFloat xLength = _dataDispalyImgView.frame.size.width;
        CGFloat yLength = _dataDispalyImgView.frame.size.height;
        CGFloat xValue = point.x;
        CGFloat yValue = point.y;
        
        [[UIColor clearColor] setFill];
        if (!_curveColor) {
            _curveColor = [UIColor whiteColor];
        }
        [_curveColor setStroke];
        CGContextFillEllipseInRect(context, _dataDispalyImgView.bounds);
        
        [bezierPath moveToPoint:CGPointMake((xValue / _xMaxData) * xLength, yLength - (yValue / _yMaxData ) * yLength)];
        
        for (NSValue *value in _dataArrary)
        {
            point = [value CGPointValue];
            xValue = point.x;
            yValue = point.y;

            [bezierPath addLineToPoint:CGPointMake((xValue / _xMaxData) * xLength, yLength - (yValue / _yMaxData ) * yLength)];
            
        }
        CGContextAddPath(context, bezierPath.CGPath);
        CGContextDrawPath(context, kCGPathFillStroke);
        CGContextFillPath(context);
        _dataDispalyImg = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        dispatch_async(dispatch_get_main_queue(), ^{
            _dataDispalyImgView.image = _dataDispalyImg;
        });
        
    });
}

重新设置数据源：

-(void)resetDataArray:(NSArray *)dataArrary
{
    if (_isDynamicRefreshData) {
        _dataArrary = dataArrary;
        [self drawDataImg];
    }
}

回头看看实现的思路，不过先看看截图就好说一点：

屏幕快照 .png

这个绘画总共有两张图片构成，整的背景图片为整个坐标系，因为整个坐标系不会变化，只要绘制一次就可以，宁外红色部分是数据展示部分，因为数据部分可能改变，如显示人的脉搏跳动数据实时改变，所以实时绘制，因此创建了一个串行队列，在串行队列中绘制，保证数据会被一张一张的绘制，一张一张的显示，不会乱。
现在看看使用方式：

-(void)testDataCurveView1
{
    //随机参数数据,模拟情况
    NSMutableArray *dataArray = [NSMutableArray array];
    for( float i = 0; i<= 70 ;i+=1)
    {
        CGFloat value = arc4random() % 201;
        CGPoint point = CGPointMake(i, value);
        [dataArray addObject:[NSValue valueWithCGPoint:point]];
    }
    
    JDataCurveView *dataCurveView = [JDataCurveView dataCurveView];
    dataCurveView.frame = CGRectMake(10, 64, self.view.frame.size.width - 20, 250);
    dataCurveView.yCoordinateName = @"海拔";
    dataCurveView.yCoordinateUnitName = @"米";
    dataCurveView.xCoordinateName = @"时间";
    dataCurveView.xCoordinateUnitName = @"分";
    dataCurveView.yDisplayData = @[@0,@50,@100,@150,@200];
    dataCurveView.xDisplayData = @[@0,@20,@40,@60,@70];
    dataCurveView.dataArrary = dataArray;
    dataCurveView.curveColor = [UIColor blueColor];
    dataCurveView.xMaxData = 70;
    dataCurveView.yMaxData = 200;
    [self.view addSubview:dataCurveView];
}

-(void)testDataCurveView2
{
    _dArray = [NSMutableArray array];
    //随机参数数据，模拟情况
    for( float i = 0; i<= 80 ;i+=1)
    {
        CGFloat value = arc4random() % 45 + 20;
        CGPoint point = CGPointMake(i, value);
        [self.dArray addObject:[NSValue valueWithCGPoint:point]];
    }
    
    JDataCurveView *dataCurveView = [JDataCurveView dataCurveView];
    dataCurveView.frame = CGRectMake(10, 340, self.view.frame.size.width - 20, 250);
    dataCurveView.isDynamicRefreshData = YES;
    dataCurveView.yCoordinateName = @"脉搏";
    dataCurveView.yCoordinateUnitName = @"次";
    dataCurveView.xCoordinateUnitName = @"无";
    dataCurveView.yDisplayData = @[@0,@20,@40,@60,@80];
    dataCurveView.xDisplayData = @[@0,@20,@40,@60,@80];
    dataCurveView.isNeedDisplayXData = NO;
    dataCurveView.dataArrary = self.dArray;
    dataCurveView.curveColor = [UIColor brownColor];
    dataCurveView.xMaxData = 80;
    dataCurveView.yMaxData = 80;
    _dataCurveView = dataCurveView;
    [self.view addSubview:dataCurveView];
    
    _timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerAction) userInfo:nil repeats:YES];

-(void)timerAction
{
    NSMutableArray *array = [NSMutableArray array];
    for(int i = 1;i<self.dArray.count;i++)
    {
        NSValue *value = self.dArray[i];
        CGPoint point = [value CGPointValue];
        [array addObject:[NSValue valueWithCGPoint:CGPointMake(point.x - 1, point.y)]];

    }
    [self.dArray removeAllObjects];
    
    CGFloat value = arc4random() % 45 + 20;
    CGPoint point = CGPointMake(80, value);
    [array addObject:[NSValue valueWithCGPoint:point]];
    self.dArray = array;
    [_dataCurveView resetDataArray:self.dArray];
}
    
}

看看运行结果，因为会实时绘制，所以我做成了gif图片，便于展示，如下：

curveVideo.mov_1455780994.gif
代码上传github：https://github.com/jiangtaidi/DataCurveDemo.git 感兴趣的可以下载运行一下，希望对你有用！

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