Question

Hi I want to make bar chart as shown here

I want to plot graph using coreplot example : (coreplot gallery- Vertical Bar Chart)

Currently default code plots the graph as shown below

How can I achieve this?

I tried adding another graph but didn’t work out well.

Please Help and Suggest

Thanks

Answer 1

Here is my solution:

In your code you need to add the following:

-(NSNumber *)numberForPlot:(CPPlot *)plot
                 field:(NSUInteger)fieldEnum
           recordIndex:(NSUInteger)index
{
    if (plot.identifier==@"locked") {
        switch ( fieldEnum ) {
            case CPBarPlotFieldBarLocation:
                return (NSDecimalNumber *)[NSDecimalNumber numberWithUnsignedInteger:index];
            case CPBarPlotFieldBarLength:
                return [self.lockedPercentage objectAtIndex:index];
            }
    }else if (plot.identifier==@"occupied") {
        switch ( fieldEnum ) {
            case CPBarPlotFieldBarLocation:
                return (NSDecimalNumber *)[NSDecimalNumber numberWithUnsignedInteger:index];
            case CPBarPlotFieldBarLength:
                return [self.occupiedPercentage objectAtIndex:index];
        }
    }else if (plot.identifier==@"empty") {
        switch ( fieldEnum ) {
            case CPBarPlotFieldBarLocation:
                return (NSDecimalNumber *)[NSDecimalNumber numberWithUnsignedInteger:index];
            case CPBarPlotFieldBarLength:
                return [self.emptyPercentage objectAtIndex:index];
        }
    }
    return nil;
}

The lines plot.identifier are here important, they check which data to take, here occupied empty or locked.

Of course you need to set these identifiers, I do this in a -(void) loadgraph:

//  Bar plot Locked
CPBarPlot *barPlot = [CPBarPlot tubularBarPlotWithColor:[CPColor blueColor] horizontalBars:NO];
barPlot.dataSource = self;
barPlot.baseValue = CPDecimalFromString(@"0");
barPlot.barOffset = 0.0f+viewOffset;
barPlot.barWidth = 15.0f;
barPlot.identifier = @"occupied";

[graph addPlot:barPlot toPlotSpace:plotSpace];

Here one of my identifier is set. To display values below the x-axe you need to change your range:

    plotSpace.yRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0.0f) length:CPDecimalFromFloat(100.0f)];

Hope this helps.