iphone，使用数组在核心绘图范围内定义答案

【问题标题】：iphone, using an array to define in core-plot rangeiphone，使用数组在核心绘图范围内定义
【发布时间】：2010-06-17 09:15:46
【问题描述】：

我已经完成了几天工作的核心情节图。我仍然无法做的事情（我找不到这方面的文档），就是将 x 轴标签更改为我需要的。今天，我有一个 x 轴，每 5 个值显示一个整数标签：“5 10 15 ...”，我需要对应过去 24 小时的标签。例如，如果现在是 15:00，我需要如下标签：“15 16 17 ... 23 0 1 2 .. 15”我正在考虑为此使用 NSArray 并将其传递给 plotSpace.xRange 但我没有知道这是否是这样做的好方法。这是我的代码：

            CPXYPlotSpace *plotSpace = (CPXYPlotSpace *)graph.defaultPlotSpace;
            plotSpace.xRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-15)
                                                           length:CPDecimalFromFloat(xmax + 15)];
            plotSpace.yRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-1000)
                                                           length:CPDecimalFromFloat(4300)];


            // Setup axis
            CPXYAxisSet *axisSet = (CPXYAxisSet *)graph.axisSet;
            CPLineStyle *lineStyle = [CPLineStyle lineStyle];
            lineStyle.lineColor = [CPColor whiteColor];
            lineStyle.lineWidth = 1.0f;
            CPTextStyle *cyanStyle = [CPTextStyle textStyle];
            cyanStyle.color = [CPColor cyanColor];
            NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
            [formatter setMaximumFractionDigits:0];

            axisSet.xAxis.majorIntervalLength = [[NSDecimalNumber decimalNumberWithString:@"5"] decimalValue];
            axisSet.xAxis.minorTicksPerInterval = 0;
            axisSet.xAxis.majorTickLineStyle = lineStyle;
            axisSet.xAxis.minorTickLineStyle = lineStyle;
            axisSet.xAxis.axisLineStyle = lineStyle;
            axisSet.xAxis.majorTickLength = 5.0f;
            axisSet.xAxis.labelOffset = 3.0f;
            axisSet.xAxis.labelExclusionRanges = [NSArray arrayWithObjects:
                                      [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-15) 
                                                                  length:CPDecimalFromFloat(15)], 
                                      nil];
            axisSet.xAxis.visibleRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromInteger(0) length:CPDecimalFromInteger(xmax)];
            axisSet.xAxis.labelFormatter = formatter;
            axisSet.xAxis.title = @"Hour";
            axisSet.xAxis.titleOffset = 25.0f;
            axisSet.xAxis.titleLocation = CPDecimalFromFloat(25.0f);
            axisSet.xAxis.titleTextStyle = cyanStyle;

非常欢迎任何帮助:) 非常感谢，卢克

【问题讨论】：

标签： iphone range core-plot

【解决方案1】：

我终于找到了使用自定义标签的解决方案：

            NSArray *customTickLocations = [NSArray arrayWithObjects:[NSDecimalNumber numberWithInt:0],
                                                                     [NSDecimalNumber numberWithInt:5],
                                                                     [NSDecimalNumber numberWithInt:10],
                                                                     [NSDecimalNumber numberWithInt:15],
                                                                     [NSDecimalNumber numberWithInt:20],
                                                                     [NSDecimalNumber numberWithInt:25],
                                                                     [NSDecimalNumber numberWithInt:30],
                                                                     [NSDecimalNumber numberWithInt:35],                                                
                                                                     [NSDecimalNumber numberWithInt:40],                                                
                                                                     nil];
            NSArray *xAxisLabels = [NSArray arrayWithObjects:@"15",@"18",@"21",@"0",@"3",@"6",@"9",@"12",@"15",nil];

            NSUInteger labelLocation = 0;
            NSMutableArray *customLabels = [NSMutableArray arrayWithCapacity:[xAxisLabels count]];
            for (NSNumber *tickLocation in customTickLocations) {
                CPAxisLabel *newLabel = [[CPAxisLabel alloc] initWithText: [xAxisLabels objectAtIndex:labelLocation++] textStyle:axisSet.xAxis.labelTextStyle];
                newLabel.tickLocation = [tickLocation decimalValue];
                newLabel.offset = axisSet.xAxis.labelOffset + axisSet.xAxis.majorTickLength;
                [customLabels addObject:newLabel];
                [newLabel release];
            }

            axisSet.xAxis.axisLabels =  [NSSet setWithArray:customLabels];

还有一些事情要澄清，但这肯定是要走的路:) 卢克

【讨论】：