Scrolling through data only in core plot iOS - ios

Currently I'm using core plot cocoa pod to draw a scatter graph, currently I need scrolling to be enabled but at the same time I need the x & y axis the be fixed on the corner of the screen and only move through data any way to do this ?.
My current implementation for the following code makes me scrolls through data but x-axis or y-axis disappears when I scroll far through the graph
-(void) viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
CPTGraphHostingView* hostView = [[CPTGraphHostingView alloc] initWithFrame:self.view.frame];
[self.view addSubview: hostView];
// Create a CPTGraph object and add to hostView
CPTGraph* graph = [[CPTXYGraph alloc] initWithFrame:hostView.bounds];
hostView.hostedGraph = graph;
// Get the (default) plotspace from the graph so we can set its x/y ranges
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
plotSpace.allowsUserInteraction=YES;
// Note that these CPTPlotRange are defined by START and LENGTH (not START and END) !!
[plotSpace setYRange:[CPTPlotRange plotRangeWithLocation:[NSNumber numberWithInt:0] length:[NSNumber numberWithInt:10]]];
[plotSpace setXRange:[CPTPlotRange plotRangeWithLocation:[NSNumber numberWithInt:0] length:[NSNumber numberWithInt:10]]];
plotSpace.delegate = self;
graph.paddingLeft = 10.0;
graph.paddingRight = 10.0;
graph.paddingTop = 10.0;
graph.paddingBottom = 10.0;
// Create the plot (we do not define actual x/y values yet, these will be supplied by the datasource...)
CPTScatterPlot* plot = [[CPTScatterPlot alloc] initWithFrame:CGRectZero];
// Let's keep it simple and let this class act as datasource (therefore we implemtn <CPTPlotDataSource>)
plot.dataSource = self;
// Finally, add the created plot to the default plot space of the CPTGraph object we created before
[graph addPlot:plot toPlotSpace:graph.defaultPlotSpace];
}
Thanks in advance :)

Use the axisConstraints:
x.axisConstraints = [CPTConstraints constraintWithRelativeOffset:0.0];
y.axisConstraints = [CPTConstraints constraintWithRelativeOffset:0.0];
Use 0.0 to place the axis to the left (y-axis) or bottom (x-axis). Use 1.0 to place the axis to the right (y-axis) or top (x-axis). Any fraction between 0.0 and 1.0 is valid.

Related

Remove blank space around scatter graph in core plot

I'm using core plot for line graph.in the scatter graph i'm getting some blank space around the scatter graph.as you can see the screen shot(in debug mode) my graph plot area is covered by empty space.How can i remove it?
Initialising host view
self.hostView = [(CPTGraphHostingView *) [CPTGraphHostingView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height-10)];
self.hostView.backgroundColor = [UIColor clearColor];;
self.hostView.allowPinchScaling = NO;
[self addSubview:self.hostView];
Initializing graph
graph = [[CPTXYGraph alloc] initWithFrame:self.hostView.bounds];
[graph applyTheme:[CPTTheme themeNamed:kCPTPlainWhiteTheme]];
self.hostView.hostedGraph = graph;
EDIT
graph.plotAreaFrame.PaddingLeft = 55.0f;
graph.plotAreaFrame.PaddingRight = 15.0f;
graph.plotAreaFrame.PaddingTop = 10.0f;
graph.plotAreaFrame.paddingBottom = 28.0;
These are the paddings i have provided.
The graph starts with 20 pixels of padding on each edge but that's easy to change:
graph.PaddingLeft = 0.0;
graph.PaddingTop = 0.0;
graph.PaddingRight = 0.0;
graph.PaddingBottom = 0.0;

Core Plot extremely slow on iOS?

I am having issues with a simple X/Y scatter plot with Core Plot 2.0 on iOS 7.1
The following plot code:
CPTGraphHostingView* graphHostView;
CPTXYGraph* graph;
CPTScatterPlot* plot;
CPTXYPlotSpace* plotSpace;
DebugLog(#"Initializing GRAPH HOST VIEW");
graphHostView = [[CPTGraphHostingView alloc] initWithFrame:CGRectMake(10, 10, 300, 200)];
[self addSubview: graphHostView];
// Create a CPTGraph object and add to hostView
graph = [[CPTXYGraph alloc] initWithFrame:graphHostView.bounds];
graphHostView.hostedGraph = graph;
// Get the (default) plotspace from the graph so we can set its x/y ranges
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
// Note that these CPTPlotRange are defined by START and LENGTH (not START and END) !!
[plotSpace setYRange: [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat( 0 ) length:CPTDecimalFromFloat( 20000 )]];
[plotSpace setXRange: [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat( 0 ) length:CPTDecimalFromFloat( 6 )]];
// Create the plot (we do not define actual x/y values yet, these will be supplied by the datasource...)
plot = [[CPTScatterPlot alloc] initWithFrame:CGRectZero];
plot.dataSource = dataSource;
[graph addPlot:plot toPlotSpace:graph.defaultPlotSpace];
takes just about 60 seconds to complete grinding at 100% CPU usage, and allocating steadily up to 300 MB RAM. What could be up? The graph is being hosted in a "parent" UIView.
I have used Core Plot before, and while it seemed slow, this is clearly totally unacceptably slow! What could be the cause of this?
I solved this by using dispatch_async when updating my graph. For example, in my code i Used:
dispatch_async(dispatch_get_main_queue(), ^{
[self setupGraph];
});
I hope this helps.

CorePlot multiple scatterplots huge memory consumption

I'm experiencing some problems with CorePlot. I try to plot multiple scatterPlots into one graph. Which works as expected but when I start scrolling or zooming the graph the whole app increases it's memory usage up to 900MB an crashes. I think I have to do some object releasing but I don't know how. Basically I plot each line with a different plot identifier and put the according data into the datasource.
Here is what I got: (In this example code I just reduced the axe ranges with static values for testing purposes.)
- (void)setupGraph {
// Create graph from theme
self.graph = [[CPTXYGraph alloc] initWithFrame:self.scatterPlotView.bounds];
self.graph.plotAreaFrame.masksToBorder = NO;
self.scatterPlotView.hostedGraph = self.graph;
CPTTheme *theme = [CPTTheme themeNamed:kCPTPlainBlackTheme];
[self.graph applyTheme:theme];
self.graph.paddingLeft = 0.0;
self.graph.paddingTop = 0.0;
self.graph.paddingRight = 0.0;
self.graph.paddingBottom = 0.0;
// Setup plot space
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)self.graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
plotSpace.delegate = self;
plotSpace.globalXRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(0) length:CPTDecimalFromDouble(30)];
plotSpace.globalYRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(0) length:CPTDecimalFromDouble(15)];
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(0) length:CPTDecimalFromDouble(10)];
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(0) length:CPTDecimalFromDouble(15)];
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)self.graph.axisSet;
CPTXYAxis *x = axisSet.xAxis;
CPTXYAxis *y = axisSet.yAxis;
x.labelingPolicy = CPTAxisLabelingPolicyNone;
y.labelingPolicy = CPTAxisLabelingPolicyNone;
}
This method loads my data and draws the scatterplots
- (void)loadSignals {
//Data loading logic goes here nothing special just one array for each plot
for (Signal *sig in [signals allValues]) {
[self constructScatterPlot:sig.name];
}
}];
This is where the drawing happens:
- (void)constructScatterPlot:(NSString *)identifier {
CPTScatterPlot *dataSourceLinePlot = [[CPTScatterPlot alloc] init];
CPTMutableLineStyle *lineStyle = [dataSourceLinePlot.dataLineStyle mutableCopy];
CPTScatterPlot *boundLinePlot = [[CPTScatterPlot alloc] init];
boundLinePlot.identifier = identifier;
lineStyle = [boundLinePlot.dataLineStyle mutableCopy];
lineStyle.miterLimit = 1.0;
lineStyle.lineWidth = 1.0;
lineStyle.lineColor = [CPTColor redColor];
boundLinePlot.dataLineStyle = lineStyle;
boundLinePlot.dataSource = self;
boundLinePlot.cachePrecision = CPTPlotCachePrecisionDouble;
boundLinePlot.interpolation = CPTScatterPlotInterpolationStepped;
[self.graph addPlot:boundLinePlot];
}
...and this is where the datasource gets it's values:
-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index
{
NSString *plotIdent = (NSString *) plot.identifier;
if (![plotIdent isEqualToString:self.currentIdent]) {
self.countPlot++;
self.currentIdent = plotIdent;
}
Signal *newSig = [self.signals objectForKey:plotIdent];
Value * newValue = [newSig valueAtTime:index];
NSNumber *number = [NSNumber numberWithInteger:[newValue.value integerValue]];
if ( fieldEnum == CPTScatterPlotFieldY ) {
return number;
}
if ( fieldEnum == CPTScatterPlotFieldX ) {
return [NSNumber numberWithInteger:index];
}
return nil;
}
So first of all I'd like to know if this is the correct way of drawing multiple plots (up to 40 in my case) into one graph? If so, what could I do to optimize my plot performance?
The output should look like this:
I found this use
"try setting collapsesLayers to YES on the hosting view"
Application get stuck when drawing nearly 40 Scatter Plots using Core Plot in IPad
Each plot is a CALayer that covers the entire plot area of the graph, so with 40 of them you may be using up most of the available video memory. If they all use the same line style, you can plot all of the lines on the same plot and save some memory that way. Insert an extra data point between the line segments and return nil or #(NAN) from the datasource to break the line.

Initialize the default zoom

When my scatter plot appears, I see that :
But I would like to se that :
Directly after chart loading, I want that the user see a chart with all data displaying, and not just a small piece like in the first screenshot. How can I define the original "zoom" ?
EDIT : (here's my code)
[...]
CPTGraph *graph = self.hostView.hostedGraph;
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
CPTScatterPlot *myPlot = [[CPTScatterPlot alloc] init];
myPlot.dataSource = self;
myPlot.delegate = self;
CPTColor *myColor = [CPTColor greenColor];
[graph addPlot:myPlot toPlotSpace:plotSpace];
myPlot.plotSymbolMarginForHitDetection = 10.0f;
[plotSpace scaleToFitPlots:[NSArray arrayWithObject:myPlot]];
CPTMutablePlotRange *xRange = [plotSpace.xRange mutableCopy];
[xRange expandRangeByFactor:CPTDecimalFromCGFloat(DynamicValue)];
plotSpace.xRange = xRange;
CPTMutablePlotRange *yRange = [plotSpace.yRange mutableCopy];
[yRange expandRangeByFactor:CPTDecimalFromCGFloat(DynamicValue)];
plotSpace.yRange = yRange;
[...]
Many of the Core Plot example apps use -[CPTPlotSpace scaleToFitPlots:] to adjust the plot ranges to the plot data. If you already know the data range, you set the plot space xRange and/or yRange directly when setting up the graph.

Core plot axis labels not visible outside plot area

I'm having some trouble with the axis labels. It seems my custom labels aren't visible outside of the plot area. Looking at the Design Overview for core plot, the axis labels should be outside of the plot area. Any ideas on how I can make them visible outside the plot area?
The code/image below shows how the labels only show within the plot area. If I change the label offset to a positive number, the labels do not show at all. I'm using Core Plot 0.9 with iOS 5.
Thanks in advance!
CPTTheme *theme = [CPTTheme themeNamed:kCPTPlainWhiteTheme];
graph = [[theme newGraph] retain];;
CPTGraphHostingView *hostingView = (CPTGraphHostingView *)self.view;
hostingView.hostedGraph = graph;
graph.paddingLeft = 40.0;
graph.paddingTop = 40.0;
graph.paddingRight = 40.0;
graph.paddingBottom = 40.0;
graph.masksToBorder = NO;
// ... setup axis
axisSet.yAxis.majorIntervalLength = CPTDecimalFromInt(0);
axisSet.yAxis.minorTicksPerInterval = 0;
axisSet.yAxis.labelingPolicy = CPTAxisLabelingPolicyNone;
// if this number is negative, the labels show,
// if it is positive, that is outside the plot area, the labels are hidden.
axisSet.yAxis.labelOffset = -20;
// ... setup labels
NSMutableArray *labels = [NSMutableArray array];
for (int i = 0; i < reportData.rowCount; ++i) {
CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:[NSString stringWithFormat:#"Test Row %i", i] textStyle:labelStyle];
label.tickLocation = CPTDecimalFromInt(i);
label.offset = axisSet.yAxis.labelOffset;
label.alignment = CPTAlignmentLeft;
[labels addObject:label];
[label release];
}
axisSet.yAxis.axisLabels = [NSSet setWithArray:labels];
Set some padding on the plot area frame in addition to or instead of the graph itself.
graph.plotAreaFrame.paddingTop = 20.0;
graph.plotAreaFrame.paddingBottom = 50.0;
graph.plotAreaFrame.paddingLeft = 50.0;
graph.plotAreaFrame.paddingRight = 50.0;
This code is from the axis demo in the Plot Gallery example app.
I was having exactly the same problem and tried every solution I could find online for this with no success.
Finally I got it to work by turning off the border masking, like this:
graph.plotAreaFrame.masksToBorder = NO;

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