[英]Core-Plot: Personalizing Plot
我正在尝试iOS的Core Plot库。 我设法显示了包含我的信息的图表,但是我无法根据需要个性化可视化。
我正在尝试使用一个简单的散点图来显示用户在两个日期之间一天的行进距离。 我已经成功创建了用于绘图的数据,但是我很难个性化绘图,也许有人使用了这个库可以帮助我;)
我的问题是:
-如果我只显示x和y轴的正向侧面,则看不到标签。
-例如,如果两个日期之间有31天,则x轴从0变为30。如何更改标签以显示日期,例如startDate + x。 到目前为止,这是我所做的:
@interface DistanceChart : CPGraphHostingView <CPPlotDataSource> {
CPXYGraph *graph;
NSMutableArray *dataForPlot;
RouteManager *routeManager;
NSDate *startDate;
NSDate *endDate;
}
@property (nonatomic, retain) NSMutableArray *dataForPlot;
@property (nonatomic, retain) RouteManager *routeManager;
@property (nonatomic, retain) NSDate *startDate;
@property (nonatomic, retain) NSDate *endDate;
- (void)initPlot;
@end
@implementation DistanceChart
@synthesize dataForPlot;
@synthesize routeManager;
@synthesize startDate;
@synthesize endDate;
- (void)initPlot {
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd-MM-yyyy"];
self.startDate = [dateFormatter dateFromString:@"01-05-2011"];
self.endDate = [dateFormatter dateFromString:@"31-05-2011"];
//get the data
self.dataForPlot = [routeManager getTotalDistanceByDay:routeManager.routes from:startDate to:endDate];
NSLog(@"Data: %@", dataForPlot);
graph = [[CPXYGraph alloc] initWithFrame:CGRectZero];
self.hostedGraph = graph;
graph.paddingLeft = 5;
graph.paddingTop = 5;
graph.paddingRight = 5;
graph.paddingBottom = 5;
// Setup plot space
int days = [endDate timeIntervalSinceDate:startDate] / 60 / 60 / 24 + 1;
CPXYPlotSpace *plotSpace = (CPXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
plotSpace.xRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0) length:CPDecimalFromFloat(days)];
plotSpace.yRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0) length:CPDecimalFromFloat(15)]; //TODO: set maximum Y according to max distance
// Axes
CPXYAxisSet *axisSet = (CPXYAxisSet *)graph.axisSet;
CPXYAxis *x = axisSet.xAxis;
x.majorIntervalLength = CPDecimalFromString(@"1");
x.orthogonalCoordinateDecimal = CPDecimalFromString(@"0");
x.minorTicksPerInterval = 1;
CPXYAxis *y = axisSet.yAxis;
y.majorIntervalLength = CPDecimalFromString(@"1");
y.minorTicksPerInterval = 1;
y.orthogonalCoordinateDecimal = CPDecimalFromString(@"0");
x.labelRotation = M_PI/8;
// Create a green plot area
CPScatterPlot *dataSourceLinePlot = [[[CPScatterPlot alloc] init] autorelease];
dataSourceLinePlot.identifier = @"Green Plot";
CPMutableLineStyle *lineStyle = [[dataSourceLinePlot.dataLineStyle mutableCopy] autorelease];
lineStyle.lineWidth = 2.f;
lineStyle.lineColor = [CPColor greenColor];
dataSourceLinePlot.dataLineStyle = lineStyle;
dataSourceLinePlot.dataSource = self;
// Put an area gradient under the plot above
CPColor *areaColor = [CPColor colorWithComponentRed:0.3 green:1.0 blue:0.3 alpha:0.8];
CPGradient *areaGradient = [CPGradient gradientWithBeginningColor:areaColor endingColor:[CPColor clearColor]];
areaGradient.angle = -90.0f;
CPFill *areaGradientFill = [CPFill fillWithGradient:areaGradient];
dataSourceLinePlot.areaFill = areaGradientFill;
dataSourceLinePlot.areaBaseValue = CPDecimalFromString(@"1.75");
// Animate in the new plot, as an example
dataSourceLinePlot.opacity = 0.0f;
dataSourceLinePlot.cachePrecision = CPPlotCachePrecisionDecimal;
[graph addPlot:dataSourceLinePlot];
CABasicAnimation *fadeInAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
fadeInAnimation.duration = 1.0f;
fadeInAnimation.removedOnCompletion = NO;
fadeInAnimation.fillMode = kCAFillModeForwards;
fadeInAnimation.toValue = [NSNumber numberWithFloat:1.0];
[dataSourceLinePlot addAnimation:fadeInAnimation forKey:@"animateOpacity"];
}
#pragma mark -
#pragma mark Plot Data Source Methods
- (NSUInteger)numberOfRecordsForPlot:(CPPlot *)plot
{
return [dataForPlot count];
}
- (NSNumber *)numberForPlot:(CPPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index
{
NSDecimalNumber *num = [[dataForPlot objectAtIndex:index] valueForKey:(fieldEnum == CPScatterPlotFieldX ? @"x" : @"y")];
return num;
}
- (CPLayer *)dataLabelForPlot:(CPPlot *)plot recordIndex:(NSUInteger)index
{
return nil;
}
- (void)dealloc {
[dataForPlot release];
[routeManager release];
[startDate release];
[endDate release];
[super dealloc];
}
@end
您可能需要增加填充以显示标签。 您可能还需要在plotAreaFrame
上添加填充。
Core Plot中包含几个示例程序(“ DatePlot”和“ MinorTickLabels”),它们显示了如何在轴上格式化日期和时间。
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