我已經查看了大多數似乎最相關的問題，但他們中沒有一個真正涉及到我目前有點麻煩。我的問題是，儘管我知道我需要更新plotSpace.xRange，不管我如何更新它，要麼沒有任何反應，要麼我會崩潰。CorePlot：更新實時繪製的X軸範圍
我現在正在做的是我有2個全局變量（xMinVal，xMaxVal）聲明在我的RealTimeScatterPlot.m文件中，而這些就是我在繪圖初始化時使用的plotSpace.xRange計算。然後，我的視圖控制器託管劇情視圖包含一個函數，每秒生成一個隨機點並繪製。在這個函數內部，我會追蹤我是否有超過25個點（我的默認x軸範圍從0到50），如果我這樣做，我嘗試將RealTimeScatterPlot.m中的全局值增加1，應該在理論上將我的圖的觀點轉移1.第一次增加會發生，儘管視圖沒有改變，我也不能再次增加，因爲值保持不變。如果看到代碼會讓我知道，我會編輯它，但它的所有非常簡單/通用。我在想，不是編碼問題，這可能不是我應該實現的方式。
任何有識之士將非常感激！
你可以做你想做的事情，就像tableview數據更新一樣簡單。 這裏是代碼的一部分，我已經做了你可以使用它作爲參考。希望這可以幫助你。
-(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;
}
我子類真正的繪圖表是這樣的：
注：我沒有把我用在這裏繪製標籤，並決定一些方法涼圖形 的我把本代碼來顯示創建實時情節的想法。
在my.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my.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
我的解決辦法結束不完全是看起來像，但似乎是一個相當完整的答案。 – 2012-07-12 15:42:05
@KarolyS你可以用解決方案添加你自己的答案，我在完全相同的麻煩中運行。 – 2014-05-21 18:56:17
@ Roma-MT我可以看到，如果我能在第二天左右爲你找到我的解決方案，不幸的是，很久以前，我不太記得我的解決方案。 – 2014-05-21 19:12:05