ScatterPlot doens't work properly - dots isn't connected - ios

Question

I am developing a project using Core-Plot with Objective-C. The client asks to create a line chart (using Scatter Plot for this) where plots the number of ocurrencies x the time.
Well, after study for almost a week, this isn't working. My dots aren't connected and I don't know why.
This blue line should've been connected, since it is one plot.
Here is my code:
-(void)renderInLayer:(CPTGraphHostingView *)layerHostingView withTheme:(CPTTheme *)theme animated:(BOOL)animated{
CPTGraph *graph = [[CPTXYGraph alloc] initWithFrame:bounds];
[self addGraph:graph toHostingView:layerHostingView];
[self applyTheme:theme toGraph:graph withDefault:[CPTTheme themeNamed:kCPTDarkGradientTheme]];
graph.paddingTop = 20.0;
graph.paddingRight = 20.0;
graph.paddingLeft = 20.0;
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
plotSpace.delegate = self;
CPTMutableLineStyle *axesLineStyle = [CPTMutableLineStyle lineStyle];
axesLineStyle.lineWidth = 1.0f;
axesLineStyle.miterLimit = 1.0f;
axesLineStyle.lineColor = [CPTColor grayColor];
CPTTextStyle *labelTextStyle = [CPTTextStyle textStyleWithAttributes:#{ NSForegroundColorAttributeName: BoardGraphValueColor, NSFontAttributeName: BoardGraphValueFont}];
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
NSNumberFormatter * axisFormat = [[NSNumberFormatter alloc] init];
[axisFormat setNumberStyle:NSNumberFormatterNoStyle];
CPTXYAxis *x = axisSet.xAxis;{
x.visibleRange = [CPTPlotRange plotRangeWithLocation:#(-1.0) length:#(100)];
x.labelingPolicy = CPTAxisLabelingPolicyAutomatic;
x.majorIntervalLength = #2;
x.minorTicksPerInterval = 1;
x.majorTickLineStyle = axesLineStyle;
x.minorTickLineStyle = axesLineStyle;
x.axisLineStyle = axesLineStyle;
x.plotSpace = plotSpace;
x.labelTextStyle = labelTextStyle;
x.labelFormatter = axisFormat;
x.labelOffset = 5.0;
}
CPTXYAxis *y = axisSet.yAxis;{
y.visibleRange = [CPTPlotRange plotRangeWithLocation:#(-1.0) length:#(200)];
y.labelingPolicy = CPTAxisLabelingPolicyAutomatic;
y.majorIntervalLength = #30;
y.minorTicksPerInterval = 6;
y.majorTickLineStyle = axesLineStyle;
y.minorTickLineStyle = axesLineStyle;
y.axisLineStyle = axesLineStyle;
y.plotSpace = plotSpace;
y.labelTextStyle = labelTextStyle;
y.labelFormatter = axisFormat;
y.labelOffset = 5.0;
}
graph.axisSet.axes = #[x, y];
CPTMutableLineStyle *lineStyle = [[CPTMutableLineStyle alloc] init];
lineStyle.lineWidth = 2.0;
CPTScatterPlot *scatterLinePlot = [[CPTScatterPlot alloc] init];
scatterLinePlot.areaBaseValue = #(0.0);
scatterLinePlot.identifier = #(1);
scatterLinePlot.title = #"Title";
lineStyle.lineColor = [CPTColor blueColor];
scatterLinePlot.dataLineStyle = lineStyle;
scatterLinePlot.histogramOption = self.histogramOption;
scatterLinePlot.areaBaseValue = #(0);
scatterLinePlot.delegate = self;
scatterLinePlot.plotSymbolMarginForHitDetection = 5.0;
scatterLinePlot.dataSource = self;
[graph addPlot:scatterLinePlot];
CPTPlotRange *globalYRange = [CPTPlotRange plotRangeWithLocation:#0.0
length:#12.0];
plotSpace.globalYRange = globalYRange;
[plotSpace scaleToFitEntirePlots:[graph allPlots]];}
This is the code for create just one plot, but I need to create six. I did a loop but it is working that way too.
Here's the datasource:
-(NSUInteger)numberOfRecordsForPlot:(nonnull CPTPlot *)plot{
return [self.plotData objectAtIndex:0].count;}
-(NSNumber *)numberForPlot:(nonnull CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index{
NSNumber *num = nil;
NSString *key;
NSArray *currentDataPoint;
NSString *plotIdentifier = (NSString *)plot.identifier;
if ([plotIdentifier isEqual:#(1)]){
currentDataPoint = [self.plotData objectAtIndex:0];
} else if ([plotIdentifier isEqual:#(2)]){
currentDataPoint = [self.plotData objectAtIndex:1];
} else if ([plotIdentifier isEqual:#(3)]){
currentDataPoint = [self.plotData objectAtIndex:2];
} else if ([plotIdentifier isEqual:#(4)]){
currentDataPoint = [self.plotData objectAtIndex:3];
} else if ([plotIdentifier isEqual:#(5)]){
currentDataPoint = [self.plotData objectAtIndex:4];
} else if ([plotIdentifier isEqual:#(6)]){
currentDataPoint = [self.plotData objectAtIndex:5];
}
if (fieldEnum == CPTScatterPlotFieldX) {
return #(index);
} else if (fieldEnum == CPTScatterPlotFieldY) {
key = #"count";
int number = [[[currentDataPoint objectAtIndex:index] valueForKey:key] intValue];
NSLog(#"Y value for index %lu is %d", index, number);
num = [[currentDataPoint objectAtIndex:index] valueForKey:key];
return num;}
return num;
}
What am I doing wrong?
PS: Well, another bug is the color of the bar chart. Each of this should have a different color, but it doesn't work too. The colors provided is that for the legends.
Thanks in advance.

Answer 1

To change the bar color for each bar, implement the -barFillForBarPlot:recordIndex: method in the datasource and return the correct fill for each index. You can also set the border line style for each bar (e.g., to use a different color) with the -barLineStyleForBarPlot:recordIndex: datasource method.
It looks like the data line is getting clipped outside the visible area. Make sure the plot data is available from the datasource when you call -scaleToFitEntirePlots:.