我已经检查了大多数似乎最相关的问题，但没有一个真正涉及我目前遇到的一些麻烦。我的问题是，虽然我知道无论我如何尝试更新它都需要更新 plotSpace.xRange，但要么什么都没有发生，要么我崩溃了。
我目前正在做的是我在 RealTimeScatterPlot.m 文件中声明了 2 个全局变量（xMinVal，xMaxVal），这些是我在绘图初始化时用于 plotSpace.xRange 计算的变量。然后，托管绘图视图的视图控制器包含一个函数，该函数每秒生成并绘制一个随机点。在这个函数中，我跟踪查看是否有超过 25 个（我的默认 x 轴范围目前是从 0 到 50）点，如果有，我会尝试将 RealTimeScatterPlot.m 中的全局值加一，这理论上应该将我的图表视图移动 1。第一次增量发生，尽管视图没有移动，我也不能再次增量，因为值保持不变。如果看到代码有助于让我知道，我会编辑它，但它都非常简单/通用。一世'
任何见解将不胜感激！
您可以轻松地做您想做的事情，例如更新 tableview 数据。这是我所做的部分代码，您可以参考。希望这可以帮助你。
-(void) fetchArrayOffeedback {
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Pulse"
inManagedObjectContext:appDelegate.managedObjectContext];
[fetchRequest setEntity:entity];
NSPredicate *predictate = [NSPredicate predicateWithFormat:@"sessionKey == %@", appDelegateiPhone.strSessionId];
[fetchRequest setPredicate:predictate];
NSSortDescriptor *sort = [[NSSortDescriptor alloc]
initWithKey:@"date" ascending:YES];
[fetchRequest setSortDescriptors:[NSArray arrayWithObject:sort]];
[sort release];
NSError *error;
chartData = (NSMutableArray*)[appDelegate.managedObjectContext
executeFetchRequest:fetchRequest error:&error];
[chartData retain];
NSLog(@"array count :%d", [chartData count]);
[graph reloadData];
CPXYPlotSpace *plotSpace = (CPXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.xRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0.0) length:CPDecimalFromFloat(fiveHour*3)];
}
- (void)constructScatterPlotForFeedback
{
[graph release];
graph = [[CPXYGraph alloc] initWithFrame:CGRectZero];
graph.delegate = self;
CPTheme *theme = [CPTheme themeNamed:kCPPlainWhiteTheme];
[graph applyTheme:theme];
feedbackChart.hostedGraph = graph;
[feedbackChart setBackgroundColor:[UIColor clearColor]];
graph.paddingLeft = 0.0;
graph.paddingTop = 0.0;
graph.paddingRight = 0.0;
graph.paddingBottom = 0.0;
graph.plotAreaFrame.paddingLeft = 5.0;
graph.plotAreaFrame.paddingTop = 10.0;
graph.plotAreaFrame.paddingRight = 10.0;
graph.plotAreaFrame.paddingBottom = 10.0;
NSTimeInterval oneHour = 60 * 60;
CPXYPlotSpace *plotSpace = (CPXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
plotSpace.delegate = self;
float xRange;
xRange = [chartData count] + 1.0;
if (xRange>5) {
xRange = 5.0;
}
plotSpace.xRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0.0) length:CPDecimalFromFloat(fiveHour*3)];
plotSpace.yRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-20.0) length:CPDecimalFromFloat(40.0)];
CPLineStyle *gridline = [CPLineStyle lineStyle];
gridline.lineColor = [CPColor grayColor];
gridline.lineWidth = 1.0f;
CPXYAxisSet *axisSet = (CPXYAxisSet *)graph.axisSet;
CPXYAxis *x = axisSet.xAxis;
x.majorIntervalLength = CPDecimalFromFloat(fiveHour);
x.minorTicksPerInterval = 0;
x.labelOffset=0;
NSDate *refDate = [NSDate date];
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
dateFormatter.dateFormat = @"HH:mm:ss";
CPTimeFormatter *timeFormatter = [[[CPTimeFormatter alloc] initWithDateFormatter:dateFormatter] autorelease];
timeFormatter.referenceDate = refDate;
x.labelFormatter = timeFormatter;
CPXYAxis *y = axisSet.yAxis;
y.minorTicksPerInterval = 0;
y.orthogonalCoordinateDecimal = CPDecimalFromString(@"0.0");
y.majorIntervalLength = CPDecimalFromString(@"5");
y.majorGridLineStyle = nil;
y.visibleRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-20.0f) length:CPDecimalFromFloat(40.0f)];
CPConstraints yConstraints = {CPConstraintNone, CPConstraintFixed};
y.isFloatingAxis=YES;
y.constraints=yConstraints;
CPScatterPlot *dataSourceLinePlot = [[[CPScatterPlot alloc] init] autorelease];
dataSourceLinePlot.identifier = @"FeedBack Plot";
dataSourceLinePlot.dataLineStyle.lineWidth = 3.f;
dataSourceLinePlot.dataLineStyle.lineColor = [CPColor blackColor];
dataSourceLinePlot.dataLineStyle.dashPattern = [NSArray arrayWithObjects:[NSNumber numberWithFloat:1.0f], [NSNumber numberWithFloat:1.0f], nil];
dataSourceLinePlot.dataSource = self;
dataSourceLinePlot.opacity = 0.0f;
dataSourceLinePlot.cachePrecision = CPPlotCachePrecisionDecimal;
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"];
CPColor *areaColor1 = [CPColor colorWithComponentRed:0.3 green:0.3 blue:1.0 alpha:0.8];
CPGradient *areaGradient1 = [CPGradient gradientWithBeginningColor:areaColor1 endingColor:[CPColor clearColor]];
areaGradient1.angle = -90.0f;
NSUInteger i;
[graph addPlot:dataSourceLinePlot];
NSMutableArray *contentArray1 = [NSMutableArray arrayWithCapacity:100];
NSMutableArray *customTickLocations = [[NSMutableArray alloc] init];
NSMutableArray *xAxisLabels = [[NSMutableArray alloc] init];
for ( i = 0; i < [chartData count]; i++ ) {
//for ( i = 0; i < 10; i++ ) {
[customTickLocations addObject:[NSDecimalNumber numberWithInt:i]];
[xAxisLabels addObject:[NSString stringWithFormat:@"%0.1f", 5.0 * i]];
Pulse *objPulse1 = (Pulse *)[chartData objectAtIndex:i];
// id x = [NSNumber numberWithFloat:i*fiveHour];
id x = [NSNumber numberWithFloat:i];
id y = [NSNumber numberWithFloat:[objPulse1.feedBack floatValue]];
NSLog(@"point of gragh for Performance x:%@, y : %@ ", x, y);
[contentArray1 addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:x, @"x", y, @"y", nil]];
}
NSLog(@"Axis lable count : %d", [xAxisLabels count]);
NSMutableArray *customLabels = [NSMutableArray arrayWithCapacity:[chartData count]];
NSUInteger labelLocation = 0;
for (NSNumber *tickLocation in customTickLocations) {
NSLog(@">>>>>>>>>>>>>>>>> tick location");
CPAxisLabel *newLabel = [[CPAxisLabel alloc] initWithText: [xAxisLabels objectAtIndex:labelLocation++] textStyle:x.labelTextStyle];
newLabel.tickLocation = [tickLocation decimalValue];
newLabel.offset = x.labelOffset + x.majorTickLength - 5.0f;
newLabel.rotation = 0;
[customLabels addObject:newLabel];
[newLabel release];
}
x.axisLabels = [NSSet setWithArray:customLabels];
arrScatter = contentArray1;
[arrScatter retain];
}
-(NSUInteger)numberOfRecordsForPlot:(CPPlot *)plot
{
if ( [(NSString *)plot.identifier isEqualToString:@"FeedBack Plot"] ) {
return [chartData count];
}
return 0;
}
-(NSNumber *)numberForPlot:(CPPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index
{
switch ( fieldEnum ) {
case CPScatterPlotFieldX:
return (NSDecimalNumber *)[NSDecimalNumber numberWithUnsignedInteger:index*fiveHour];
case CPScatterPlotFieldY:
{
Pulse *objPulse1 = (Pulse *)[chartData objectAtIndex:index];
return [NSNumber numberWithFloat:[objPulse1.feedBack floatValue]];
}
}
return nil;
}
-(CGPoint)plotSpace:(CPPlotSpace *)space willDisplaceBy:(CGPoint)displacement {
return CGPointMake(displacement.x, 0);
}
/*
-(NSNumber *)numberForPlot:(CPPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index
{
NSDecimalNumber *num = nil;
if ( [(NSString *)plot.identifier isEqualToString:@"FeedBack Plot"] ) {
if ( [arrScatter count] != 0) {
num = [[arrScatter objectAtIndex:index] valueForKey:(fieldEnum == CPScatterPlotFieldX ? @"x" : @"y")];
}
}
return num;
}
*/
-(CPLayer *)dataLabelForPlot:(CPPlot *)plot recordIndex:(NSUInteger)index {
Pulse *objPulse1 = (Pulse *)[chartData objectAtIndex:index];
float value = [objPulse1.feedBack floatValue];
//CPTextLayer *textLayer = [[CPTextLayer alloc] initWithText:[NSString stringWithFormat:@"%d", value]];
CPTextStyle *textStyle = [CPTextStyle textStyle];
textStyle.color = [CPColor blackColor];
CPTextLayer *textLayer = [[CPTextLayer alloc] initWithText:[NSString stringWithFormat:@"%0.1f", value] style:textStyle];
return textLayer;
}
我像这样子类化了真实的绘图图：
注意：我没有放一些我在这里使用的方法来绘制标签并决定图表的酷我放了现在的代码来展示创建实时绘图的想法。
在我的.h
#import <CorePlot/CorePlot.h>
#import <Cocoa/Cocoa.h>
#import "sharedPrefferences.h"
#import "RMBlurredView.h"//Not really needed I am just using it for my custom label
@interface GenericCPTGraphView : NSView <CPTPlotDataSource,CPTPlotSpaceDelegate>
{
CPTGraphHostingView *hostView;
CPTXYGraph *graph;
NSMutableArray *plotData;
NSTextField* percentLabel;
CPTMutableLineStyle *lineStyle;
CPTScatterPlot *dataSourceLinePlot;
NSInteger currentIndex;
NSTimer* dataTimer;
BOOL animated;
}
-(void)updateGraph :(NSNumber*)Load;//method that will add the new Dots to the plot.
@end
在我的.m
#define SECTION_COUNT 15 //maybe will be changed to 16 who knows.
static const double kAlpha = 0.25; // smoothing constant
static const NSUInteger kMaxDataPoints = 40;
static NSString *const kPlotIdentifier = @"Data Source Plot";
@implementation GenericCPTGraphView
- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
plotData = [[NSMutableArray alloc] initWithCapacity:kMaxDataPoints];
[self generateData];//create plot method
[self checkGraph];
}
return self;
}
-(void)checkGraph
{
currentIndex=0;
NSDate *refDate = [NSDate dateWithNaturalLanguageString:@"12:00 Oct 29, 2009"];
NSTimeInterval oneDay = 1;
// Create graph from theme
graph = [[CPTXYGraph alloc] initWithFrame:CGRectZero];
CPTTheme *theme = [CPTTheme themeNamed:kCPTSlateTheme];
[graph applyTheme:theme];
graph.paddingLeft = 1.0;
graph.paddingTop = 1.0;
graph.paddingRight = 1.0;
graph.paddingBottom = 1.0;
graph.fill = [CPTFill fillWithColor:[CPTColor clearColor]];
graph.plotAreaFrame.fill = [CPTFill fillWithColor:[self getCPTColorObjectFromHexString:@"062118" alpha:1.0]];
graph.plotAreaFrame.borderLineStyle = nil;
graph.plotAreaFrame.cornerRadius = 0;
hostView = [[CPTGraphHostingView alloc]initWithFrame:CGRectMake(0,0,self.frame.size.width,self.frame.size.height)];
hostView.hostedGraph = graph;
RMBlurredView *LabelView = [[RMBlurredView alloc]initWithFrame:CGRectMake(1,0+hostView.frame.size.height-16 , hostView.frame.size.width-2, 15)];
[LabelView setTintColor:[sharedPrefferences colorWithHexColorString:@"000000" alpha:0.5]];
NSTextField* textLabel = [[NSTextField alloc]initWithFrame:CGRectMake(0, 1, LabelView.frame.size.width, 15)];
dataSourceLinePlot.identifier = (__bridge id<NSCopying,NSCoding,NSObject>)(kMDItemIdentifier);
[textLabel setTextColor:[NSColor whiteColor]];
// textLabel
[textLabel setBezeled:NO];
[textLabel setDrawsBackground:NO];
[textLabel setEditable:NO];
[textLabel setSelectable:NO];
[textLabel setStringValue:@"LOAD"];
[textLabel sizeToFit];
percentLabel = [[NSTextField alloc]initWithFrame:CGRectMake(0, 1, LabelView.frame.size.width, 15)];
[percentLabel setTextColor:[NSColor whiteColor]];
[percentLabel setBezeled:NO];
[percentLabel setDrawsBackground:NO];
[percentLabel setEditable:NO];
[percentLabel setSelectable:NO];
// [percentLabel setStringValue:@"X%"];
//[percentLabel sizeToFitWithAlignmentRight];
LabelView.blurRadius = 0;
dataSourceLinePlot = [[CPTScatterPlot alloc] init];
dataSourceLinePlot.dataSource = self;
[graph addPlot:dataSourceLinePlot];
// Setup scatter plot space
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = NO;
plotSpace.delegate = self;
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"];
[graph addPlot:dataSourceLinePlot];
NSTimeInterval xLow = 0.0;
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(xLow) length:CPTDecimalFromDouble(oneDay * 40.0)];
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(0.0) length:CPTDecimalFromDouble(100.0)];
// Axes
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
CPTXYAxis *x = axisSet.xAxis;
x.hidden = YES;
x.majorIntervalLength = CPTDecimalFromFloat(oneDay);
x.orthogonalCoordinateDecimal = CPTDecimalFromDouble(0.0);
x.minorTicksPerInterval = 0;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateStyle = kCFDateFormatterShortStyle;
CPTTimeFormatter *timeFormatter = [[CPTTimeFormatter alloc] initWithDateFormatter:dateFormatter];
timeFormatter.referenceDate = refDate;
x.labelFormatter = timeFormatter;
CPTXYAxis *y = axisSet.yAxis;
y.hidden = YES;
y.majorIntervalLength = CPTDecimalFromDouble(0.5);
y.minorTicksPerInterval = 1;
y.orthogonalCoordinateDecimal = CPTDecimalFromFloat(oneDay);
// Create a plot that uses the data source method
//CPTScatterPlot *dataSourceLinePlot = [[CPTScatterPlot alloc] init];
y.minorTicksPerInterval = 0;
[LabelView addSubview:percentLabel];
[LabelView addSubview:textLabel];
[graph.hostingView addSubview:LabelView];
[self addSubview:hostView];
}
-(void)updateGraph :(NSNumber*)Load
{
if ( dataSourceLinePlot ) {
if ( plotData.count >= 40 ) {
[plotData removeObjectAtIndex:0];
[dataSourceLinePlot deleteDataInIndexRange:NSMakeRange(0, 1)];
}
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromUnsignedInteger(0) length:CPTDecimalFromUnsignedInteger(kMaxDataPoints - 2)];
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromUnsignedInteger(0) length:CPTDecimalFromUnsignedInteger(1)];
NSUInteger location = (currentIndex >= kMaxDataPoints ? currentIndex - kMaxDataPoints + 2 : 0);
CPTPlotRange *newRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromUnsignedInteger(location)
length:CPTDecimalFromUnsignedInteger(kMaxDataPoints - 2)];
plotSpace.xRange = newRange;
currentIndex++;
[plotData addObject:[NSNumber numberWithDouble:((Load.doubleValue - kAlpha) / 100.0)]];
[percentLabel setStringValue:[NSString stringWithFormat:@"%ld%%",(Load.integerValue) ]];
graph.borderWidth = 0.0 ;
dataSourceLinePlot.borderWidth = 0.0;
[dataSourceLinePlot setBorderWidth:0.0];
dataSourceLinePlot.identifier = @"Date Plot";
lineStyle = [dataSourceLinePlot.dataLineStyle mutableCopy];
lineStyle.lineWidth = 2.0;
[percentLabel sizeToFitWithAlignmentRight];
lineStyle.lineColor = [self decideColor: [self numberOfSectionsToHighlight:Load.doubleValue]];
dataSourceLinePlot.dataLineStyle = lineStyle;
[dataSourceLinePlot insertDataAtIndex:(plotData.count - 1) numberOfRecords:1];//inserting object to the plot.
}
}
#pragma mark -
#pragma mark Plot Data Source Methods
-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot
{
NSLog(@"%lu",(unsigned long)plotData.count);
return plotData.count;
}
-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index
{
NSNumber *num = nil;
switch ( fieldEnum ) {
case CPTScatterPlotFieldX:
num = [NSNumber numberWithUnsignedInteger:index + currentIndex - plotData.count];
break;
case CPTScatterPlotFieldY:
num = [plotData objectAtIndex:index];
break;
default:
break;
}
return num;
}
@end