IOS使用Core-Plot画折线图

时间:2014-05-11 13:22:26   收藏:0   阅读:801

关于Core-Plot的配置,大家可以参考我的上一篇博客:http://1.wildcat.sinaapp.com/?p=99

版权所有,转载请注明原文转自:http://blog.csdn.net/wildcatlele/article/details/25483923

大家可以到:http://1.wildcat.sinaapp.com/?p=102观看本篇博客更友好的排版格式

或者你英语好也可以参考github上的wiki介绍:https://code.google.com/p/core-plot/wiki/UsingCorePlotInApplications

先看一下效果图:

bubuko.com,布布扣

好了下面说说具体使用吧:

1.修改ViewController.h文件如下:

2.在.m文件中的implement下面添加

3.在下面接着添加几个方法

4.在@end上边添加

#pragma mark - CPTPlotDataSource methods
-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot{
    return0;
}
 
-(NSNumber *)numberForPlot:(CPTPlot *)plotfield:(NSUInteger)fieldEnumrecordIndex:(NSUInteger)index{
    return[NSDecimalNumberzero];
}


5.添加下面代码到-(void)configureHost函数:

self.hostView=[(CPTGraphHostingView *)[CPTGraphHostingViewalloc]initWithFrame:CGRectMake(0,10,self.view.bounds.size.width-10,self.view.bounds.size.height/2)];
    self.hostView.allowPinchScaling=YES;
    [self.viewaddSubview:self.hostView];


以上代码的主要作用就是声明一个视图用于绘图,下面的折线图将绘制到这个视图上,然后添加为self.view的子视图。

6.添加下面代码到configureGraph:

//create an CPXYGraph and host it inside the view
    CPTTheme *theme=[CPTThemethemeNamed:kCPTPlainWhiteTheme];
    CPTXYGraph *graph=(CPTXYGraph *)[themenewGraph];
    graph.paddingLeft=10.0;
    graph.paddingTop=10.0;
    graph.paddingRight=10.0;
    graph.paddingBottom=10.0;
    self.hostView.hostedGraph=graph;
    CPTXYPlotSpace *plotSpace2=(CPTXYPlotSpace *)graph.defaultPlotSpace;
    //一屏内可显示的x,y方向的量度范围
    plotSpace2.xRange=[CPTPlotRangeplotRangeWithLocation:CPTDecimalFromCGFloat(-0.6)
                                                  length:CPTDecimalFromCGFloat(6.0)];
    plotSpace2.yRange=[CPTPlotRangeplotRangeWithLocation:CPTDecimalFromCGFloat(-1.0)
                                                  length:CPTDecimalFromCGFloat(10.0)];
 
    plotSpace2.allowsUserInteraction=YES;


7.添加下面代码到configurePlots:

 // 1 - Get graph and plot space
    CPTGraph *graph = self.hostView.hostedGraph;
    CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
 
    //2:创建线性
    CPTMutableLineStyle *lineStyle=[CPTMutableLineStyle lineStyle];
    lineStyle.miterLimit        = 1.0f;
    lineStyle.lineWidth         = 3.0f;
    lineStyle.lineColor         = [CPTColor blueColor];
 
    //3.设置数据点
    CPTScatterPlot * lowScatterPlot  = [[CPTScatterPlot alloc] init];
    lowScatterPlot.dataLineStyle = lineStyle;
    lowScatterPlot.identifier    = @"LOWER";
    lowScatterPlot.dataSource    = self;   //设置数据源
    [graph addPlot:lowScatterPlot toPlotSpace:plotSpace];
        //....
    CPTScatterPlot * highScatterPlot  = [[CPTScatterPlot alloc] init];
    highScatterPlot.dataLineStyle = lineStyle;
    highScatterPlot.identifier    = @"HIGH";
    highScatterPlot.dataSource    = self;
    [graph addPlot:highScatterPlot toPlotSpace:plotSpace];
 
    //4.设置显示区域,滑动到数据点处
    [plotSpace scaleToFitPlots:[NSArray arrayWithObjects:lowScatterPlot,highScatterPlot, nil]];
    CPTMutablePlotRange *xRange = [plotSpace.xRange mutableCopy];
    [xRange expandRangeByFactor:CPTDecimalFromCGFloat(1.1f)];
    plotSpace.xRange = xRange;
    CPTMutablePlotRange *yRange = [plotSpace.yRange mutableCopy];
    [yRange expandRangeByFactor:CPTDecimalFromCGFloat(1.2f)];
    plotSpace.yRange = yRange;
 
    //5.设置折线
    CPTMutableLineStyle *lowLineStyle = [lowScatterPlot.dataLineStyle mutableCopy];
    lowLineStyle.lineWidth = 2.0f;  //折线宽度
    lowLineStyle.lineColor = [CPTColor blueColor]; //折线颜色
    lowScatterPlot.dataLineStyle = lowLineStyle; //设置数据线样式
    CPTMutableLineStyle *lowSymbolLineStyle = [CPTMutableLineStyle lineStyle];
    lowSymbolLineStyle.lineColor = [CPTColor blueColor];
    //...
    CPTMutableLineStyle *highLineStyle = [lowScatterPlot.dataLineStyle mutableCopy];
    highLineStyle.lineWidth = 2.0f;  //折线宽度
    highLineStyle.lineColor = [CPTColor redColor]; //折线颜色
    highScatterPlot.dataLineStyle = highLineStyle; //设置数据线样式
    CPTMutableLineStyle *highSymbolLineStyle = [CPTMutableLineStyle lineStyle];
    highSymbolLineStyle.lineColor = [CPTColor redColor];
 
    //6.设置拐点
    CPTPlotSymbol *lowSymbol = [CPTPlotSymbol ellipsePlotSymbol];
    lowSymbol.fill = [CPTFill fillWithColor:[CPTColor blueColor]];
    lowSymbol.lineStyle = lowSymbolLineStyle;
    lowSymbol.size = CGSizeMake(6.0f, 6.0f); //拐点大小
    lowScatterPlot.plotSymbol = lowSymbol;
 
    CPTPlotSymbol *highSymbol = [CPTPlotSymbol ellipsePlotSymbol];
    highSymbol.fill = [CPTFill fillWithColor:[CPTColor redColor]];
    highSymbol.lineStyle = highSymbolLineStyle;
    highSymbol.size = CGSizeMake(6.0f, 6.0f); //拐点大小
    highScatterPlot.plotSymbol = highSymbol;


以上代码主要是设置折线、拐点的类型以及设置高低温两个折线图.最重要的是添加数据源 .dataSource    = self;

8.设置x、y轴的间隔及细分刻度等,添加以下代码到configureAxes函数:

CPTGraph *graph=self.hostView.hostedGraph;
 
    //1:创建线性
    CPTMutableLineStyle *lineStyle=[CPTMutableLineStylelineStyle];
    //axes 设置x,y轴属性,如原点。
    //得到x,y轴的集合
    CPTXYAxisSet *axisSet=(CPTXYAxisSet *)graph.axisSet;
    lineStyle.miterLimit=1.0f;
    lineStyle.lineWidth=0.5f;
    lineStyle.lineColor=[CPTColorblueColor];
    //设置x轴线
    CPTXYAxis *x=axisSet.xAxis;
    x.orthogonalCoordinateDecimal=CPTDecimalFromString(@"0");//原点为0.(y=0)
    x.majorIntervalLength=CPTDecimalFromString(@"1");// x轴主刻度:显示数字标签的量度间隔
 
    x.minorTicksPerInterval=0;// x轴细分刻度:每一个主刻度范围内显示细分刻度的个数
    x.minorTickLineStyle=lineStyle;
 
    //设置y 轴
    CPTXYAxis *y=axisSet.yAxis;
    y.orthogonalCoordinateDecimal=CPTDecimalFromString(@"0");
    y.majorIntervalLength=CPTDecimalFromString(@"1");
    y.minorTicksPerInterval=0;
    y.minorTickLineStyle=lineStyle;


9.设置数据源方法,修改两个方法如下:

#pragma mark - CPTPlotDataSource methods
-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot {
    return 4; //数据点个数
}
static int a=1;
-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index {
    
    switch (fieldEnum) {
        case CPTScatterPlotFieldX:
            if (a>4) {
                a=1;
            }
                return [NSNumber numberWithInt:a++];
            break;
            
        case CPTScatterPlotFieldY:
            if ([plot.identifier isEqual:@"LOWER"] == YES) {
                return [NSNumber numberWithInt:arc4random()%8];
            }else if([plot.identifier isEqual:@"HIGH"] == YES){
                return [NSNumber numberWithInt:arc4random()%8+10];
            }
            
            break;
    }
    return [NSDecimalNumber zero];
}


好了一切设置完毕运行看看效果。

补充:

Core Plot 框架结构分析

CorePlot 的类结构关系如下:

bubuko.com,布布扣

其中最核心的就是 CPTGraph,本示例中的 CPTXYGraph是它的子类;一个图 CPTGraph包含一个轴集 CPTAxiset,每个轴集可包含多个轴;一个图 CPTGraph 可包含多个图空间 CPTPlotSpace;一个图 CPTGraph 可包含多个图形CPTSplot(曲线,饼图,柱状图等);图形CPTSplot 和轴都展现在某个图空间 CPTPlotSpace 中。其余的部分,尚未介绍到,暂且不提。

也许下图能更形象地描述出 Core Plot 各种对象之间的关系。

bubuko.com,布布扣



IOS使用Core-Plot画折线图,布布扣,bubuko.com

评论(0
© 2014 mamicode.com 版权所有 京ICP备13008772号-2  联系我们:gaon5@hotmail.com
迷上了代码!