我有一个使用core-plot
框架的图,Y轴上的最低值可能大约为155。我想做的是,因此155在图表的底部开始,右靠在X轴上。
这是我的Y轴的代码:
NSInteger majorIncrement = 1;
NSInteger minorIncrement = 1;
CGFloat yMax = [[prices valueForKeyPath:@"@max.self"] doubleValue]; // should determine dynamically based on max price
NSMutableSet *yLabels = [NSMutableSet set];
NSMutableSet *yMajorLocations = [NSMutableSet set];
NSMutableSet *yMinorLocations = [NSMutableSet set];
for (NSInteger j = [[prices valueForKeyPath:@"@min.self"] doubleValue]; j <= yMax; j += minorIncrement) {
NSUInteger mod = j % majorIncrement;
if (mod == 0) {
CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:[NSString stringWithFormat:@"%i", j] textStyle:y.labelTextStyle];
NSDecimal location = CPTDecimalFromInteger(j);
label.tickLocation = location;
label.offset = -y.majorTickLength - y.labelOffset;
if (label) {
[yLabels addObject:label];
}
[yMajorLocations addObject:[NSDecimalNumber decimalNumberWithDecimal:location]];
} else {
[yMinorLocations addObject:[NSDecimalNumber decimalNumberWithDecimal:CPTDecimalFromInteger(j)]];
}
}
y.axisLabels = yLabels;
y.majorTickLocations = yMajorLocations;
y.minorTickLocations = yMinorLocations;
尝试设置orthogonalCoordinateDecimal
:
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)self.graph.axisSet;
axisSet.xAxis.orthogonalCoordinateDecimal = CPTDecimalFromFloat(155.0);
图形的可见区域由情节空间控制。将yRange
设置为包含您数据的范围:
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromCGFloat(yMin)
length:CPTDecimalFromCGFloat(yMax - yMin)];
另一个选择是告诉情节空间自动拟合当前的情节数据:
[plotSpace scaleToFitPlots:[graph allPlots]];