iOS 演示使用Core

Core-Plot的安装见我的另外一篇文章 iOS 使用 Core Plot 绘制统计图表入门,

创建图表以及将图表放到视图上的方法是：

- (void)viewDidLoad{
    [super viewDidLoad];
	// Do any additional setup after loading the view.
    NSLog(@"title = %@",self.title);
    
    
    //创建图表
    graph = [[CPTXYGraph alloc] initWithFrame:self.view.bounds];
    
    //给图表添加一个主题
    CPTTheme *theme = [CPTTheme themeNamed:kCPTDarkGradientTheme];
    [graph applyTheme:theme];
    
    //创建画板，将图表添加到画板
    CPTGraphHostingView *hostingView = [[CPTGraphHostingView alloc] initWithFrame:self.view.bounds];
    hostingView.hostedGraph = graph;
	[self.view addSubview:hostingView];
    

    //设置图表的边框
    //左边的padding设置为0
    graph.paddingLeft = 0;
    //顶部的的padding设置0
	graph.paddingTop = 0;
    //右边的padding设置为0
	graph.paddingRight = 0;
    //底部的padding设置为0
	graph.paddingBottom = 0;
    
    //坐标区域的边框设置
    //左边的padding设置为45.0
    graph.plotAreaFrame.paddingLeft = 40.0 ;
    //顶部的padding设置为40.0
    graph.plotAreaFrame.paddingTop = 40.0 ;
    //右边的padding设置为5.0
    graph.plotAreaFrame.paddingRight = 15.0 ;
    //底部的padding设置为80.0
    graph.plotAreaFrame.paddingBottom = 80.0 ;
    

    //设置坐标范围
    CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
    plotSpace.allowsUserInteraction = YES;
    plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0) length:CPTDecimalFromFloat(200.0)];
    plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0) length:CPTDecimalFromFloat(200.0)];

    //设置坐标刻度大小
    CPTXYAxisSet *axisSet = (CPTXYAxisSet *) graph.axisSet ;
    CPTXYAxis *x = axisSet.xAxis ;
    //x 轴：不显示小刻度线
    x. minorTickLineStyle = nil ;
    // 大刻度线间距： 50 单位
    x. majorIntervalLength = CPTDecimalFromString (@"50");
    // 坐标原点： 0
    x. orthogonalCoordinateDecimal = CPTDecimalFromString ( @"0" );

    CPTXYAxis *y = axisSet.yAxis ;
    //y 轴：不显示小刻度线
    y. minorTickLineStyle = nil ;
    // 大刻度线间距： 50 单位
    y. majorIntervalLength = CPTDecimalFromString ( @"50" );
    // 坐标原点： 0
    y. orthogonalCoordinateDecimal = CPTDecimalFromString (@"0");

    //创建绿色区域
    dataSourceLinePlot = [[CPTScatterPlot alloc] init];
    dataSourceLinePlot.identifier = @"Green Plot";

    //设置绿色区域边框的样式
    CPTMutableLineStyle *lineStyle = [dataSourceLinePlot.dataLineStyle mutableCopy];
    //设置线的宽度
    lineStyle.lineWidth = 1.f;
    //设置线的颜色
    lineStyle.lineColor = [CPTColor greenColor];
    //添加线到绿色区域中
    dataSourceLinePlot.dataLineStyle = lineStyle;
    //设置透明实现添加动画
    dataSourceLinePlot.opacity = 0.0f;

    //设置数据元代理
    dataSourceLinePlot.dataSource = self;
    //绿色区域添加到图表中
    [graph addPlot:dataSourceLinePlot];

    // 创建一个颜色渐变：从 建变色 1 渐变到 无色
    CPTGradient *areaGradient = [ CPTGradient gradientWithBeginningColor :[CPTColor greenColor] endingColor :[CPTColor colorWithComponentRed:0.65 green:0.65 blue:0.16 alpha:0.2]];
    // 渐变角度： -90 度（顺时针旋转）
    areaGradient.angle = -90.0f ;
    // 创建一个颜色填充：以颜色渐变进行填充
    CPTFill *areaGradientFill = [ CPTFill fillWithGradient :areaGradient];
    // 为图形设置渐变区
    dataSourceLinePlot.areaFill = areaGradientFill;
    dataSourceLinePlot.areaBaseValue = CPTDecimalFromString ( @"0.0" );
    dataSourceLinePlot.interpolation = CPTScatterPlotInterpolationLinear ;


    dataForPlot1 = [[NSMutableArray alloc] init];
    [self plotData];
}

里面调用了一个方法:plotData

有了上面的操作，其他的就是添加数据和显示数据了

下面给出方法

//添加数据
-(void) plotData{
    if ([dataSourceLinePlot.identifier isEqual:@"Green Plot"]) {
        NSString *xp1 = [NSString stringWithFormat:@"%d",1];
        NSString *yp1 = [NSString stringWithFormat:@"%d",10];
        NSMutableDictionary *point1 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:xp1, @"x", yp1, @"y", nil];
        [dataForPlot1 insertObject:point1 atIndex:0];
        
        NSString *xp2 = [NSString stringWithFormat:@"%d",10];
        NSString *yp2 = [NSString stringWithFormat:@"%d",25];
        NSMutableDictionary *point2 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:xp2, @"x", yp2, @"y", nil];
        [dataForPlot1 insertObject:point2 atIndex:1];
        
        NSString *xp3 = [NSString stringWithFormat:@"%d",30];
        NSString *yp3 = [NSString stringWithFormat:@"%d",15];
        NSMutableDictionary *point3 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:xp3, @"x", yp3, @"y", nil];
        [dataForPlot1 insertObject:point3 atIndex:2];
        
        NSString *xp4 = [NSString stringWithFormat:@"%d",50];
        NSString *yp4 = [NSString stringWithFormat:@"%d",80];
        NSMutableDictionary *point4 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:xp4, @"x", yp4, @"y", nil];
        [dataForPlot1 insertObject:point4 atIndex:3];
        
        NSString *xp5 = [NSString stringWithFormat:@"%d",70];
        NSString *yp5 = [NSString stringWithFormat:@"%d",60];
        NSMutableDictionary *point5 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:xp5, @"x", yp5, @"y", nil];
        [dataForPlot1 insertObject:point5 atIndex:4];
        
        NSString *xp6 = [NSString stringWithFormat:@"%d",90];
        NSString *yp6 = [NSString stringWithFormat:@"%d",100];
        NSMutableDictionary *point6 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:xp6, @"x", yp6, @"y", nil];
        [dataForPlot1 insertObject:point6 atIndex:5];
        
        NSString *xp7 = [NSString stringWithFormat:@"%d",110];
        NSString *yp7 = [NSString stringWithFormat:@"%d",70];
        NSMutableDictionary *point7 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:xp7, @"x", yp7, @"y", nil];
        [dataForPlot1 insertObject:point7 atIndex:6];
        
        NSString *xp8 = [NSString stringWithFormat:@"%d",130];
        NSString *yp8 = [NSString stringWithFormat:@"%d",80];
        NSMutableDictionary *point8 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:xp8, @"x", yp8, @"y", nil];
        [dataForPlot1 insertObject:point8 atIndex:7];
        
        NSString *xp9 = [NSString stringWithFormat:@"%d",200];
        NSString *yp9 = [NSString stringWithFormat:@"%d",135];
        NSMutableDictionary *point9 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:xp9, @"x", yp9, @"y", nil];
        [dataForPlot1 insertObject:point9 atIndex:8];
    }
}

-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot{
    return [dataForPlot1 count];
}

-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index{
    NSString *key = (fieldEnum == CPTScatterPlotFieldX ? @"x" : @"y");
    NSNumber *num;
    //让视图偏移
	if ( [(NSString *)plot.identifier isEqualToString:@"Green Plot"] ) {
        num = [[dataForPlot1 objectAtIndex:index] valueForKey:key];
        if ( fieldEnum == CPTScatterPlotFieldX ) {
			num = [NSNumber numberWithDouble:[num doubleValue] - r];
		}
	}
    //添加动画效果
    CABasicAnimation *fadeInAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
	fadeInAnimation.duration = 1.0f;
	fadeInAnimation.removedOnCompletion = NO;
	fadeInAnimation.fillMode = kCAFillModeForwards;
	fadeInAnimation.toValue = [NSNumber numberWithFloat:2.0];
	[dataSourceLinePlot addAnimation:fadeInAnimation forKey:@"animateOpacity"];
    return num;
}

头文件的代码如下：

#import <UIKit/UIKit.h>
#import "CorePlot-CocoaTouch.h"

@interface DetailsViewController : UIViewController<CPTPlotDataSource, CPTAxisDelegate>
{
    CPTXYGraph                  *graph;             //画板
    CPTScatterPlot              *dataSourceLinePlot;//线
    NSMutableArray              *dataForPlot1;      //坐标数组
    NSTimer                     *timer1;            //定时器
    int                         j;
    int                         r;
    
}
@property (retain, nonatomic) NSMutableArray *dataForPlot1;
@property (strong, nonatomic) NSString *title;
@property (strong, nonatomic) NSMutableArray *dataArray;

@end