CODEWITHSUNDEEP
iphoneios5core-plot
iOS Rocks
iOS Rocks

Reputation: 176

Core plot create dynamic Y axis and display graph very clear

How can i create dynamic y axis by only passing yMin and yMax graph plot automatically and display very clear.

For Example my Data is for Y axis 99.7, 99.3, 99.2, 99.0 ,100 .

so i want to y axis min start from 99 to 100 with 0.1 increment by which graph will display very clear.

my code snippet is bellow // 4 - Configre the y-axis

  y_monthly.title = lbl_M_HasDelay.text;
    y_monthly.labelAlignment = CPTAlignmentCenter;
    y_monthly.titleTextStyle = axisTitleStyle;
    y_monthly.titleOffset = -30.0f;
    y_monthly.axisLineStyle = axisLineStyle;
    y_monthly.majorGridLineStyle = gridLineStyle;
    y_monthly.labelingPolicy = CPTAxisLabelingPolicyNone;
    y_monthly.labelTextStyle = axisTextStyle;
    y_monthly.labelOffset = 16.0f;
    y_monthly.majorTickLineStyle = axisLineStyle;
    y_monthly.majorTickLength = 4.0f;
    y_monthly.minorTickLength = 2.0f;
    y_monthly.tickDirection = CPTSignPositive;
    NSMutableSet *yLabels = [NSMutableSet set];
    NSMutableSet *yMajorLocations = [NSMutableSet set];
    NSMutableSet *yMinorLocations = [NSMutableSet set];
    float minorIncrement=month_MaxY1/10;
    float majorIncrement = minorIncrement*2;
    float yMax = month_MaxY1;

    for (float j = minorIncrement; j <= yMax; j += minorIncrement)
    {
        float mod = fmodf(j, majorIncrement);
        if (mod == 0) {
            CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:[NSString stringWithFormat:@""]textStyle:y_monthly.labelTextStyle];
            [label setAlignment:CPTAlignmentTop];
            NSDecimal location = CPTDecimalFromFloat(j);
            label.tickLocation = location;
            label.offset = -y_monthly.majorTickLength - y_monthly.labelOffset;
            if (label) {
                [yLabels addObject:label];
            }
            [yMajorLocations addObject:[NSDecimalNumber decimalNumberWithDecimal:location]];
        } else {

            [yMinorLocations addObject:[NSDecimalNumber decimalNumberWithDecimal:CPTDecimalFromFloat(j)]];
        }
    }
    y_monthly.axisLabels = yLabels;
    y_monthly.majorTickLocations = yMajorLocations;
    y_monthly.minorTickLocations = yMinorLocations;

where month_MaxY1 =100 , and month_MinY1 =90.0. Please help me

Upvotes: 2

Views: 1166

Answers (2)

Eric Skroch
Eric Skroch

Reputation: 27381

Set the range of the y-axis using the plot space:

plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(99.0)
                                                length:CPTDecimalFromDouble(1.0)];

Label the axis:

y_monthly.labelingPolicy = CPTAxisLabelingPolicyFixedInterval;
y_monthly.majorIntervalLength = CPTDecimalFromDouble(0.1);

This will make ticks and labels every 0.1 unit along the y-axis. Set the labelFormatter and labelTextStyle to control the appearance of the labels.

Upvotes: 2

Martin Ullrich
Martin Ullrich

Reputation: 100581

I guess your problem is to make your X axis to be displayed at the yMin position of your graph. What you need to do is:

 x_axis.orthogonalCoordinateDecimal = CPTDecimalFromDouble(yMin);

Upvotes: 1

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