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标题: ios - Core-Plot 多 y 轴对齐问题 - 可能与缩放有关 [打印本页]
作者: 菜鸟教程小白 时间: 2022-12-12 20:51
标题: ios - Core-Plot 多 y 轴对齐问题 - 可能与缩放有关
我的问题如下:
我正在尝试绘制两个数据集(一个以英尺为单位，一个以度为单位)，以便可以比较它们(它们共享一个共同的 x 轴值)。
如您所见，我的数据似乎是正确交错的，但我无法让 yAxises 以我想要的方式运行。我希望 X 轴最大/最小值实际上与两个 Y 轴对齐。我的代码如下:
- (void)initPlot {
[self loadCoreData];
[self configureHost];
[self configureGraph];
[self configurePlots];
[self configureAxes];
}
- (void)configureHost {
self.hostView = [(CPTGraphHostingView *) [CPTGraphHostingView alloc] initWithFrame:self.view.bounds];
self.hostView.allowPinchScaling = YES;
[self.view addSubview:self.hostView];
}
- (void)configureGraph {
// 1 - Create the graph
CPTGraph *graph = [[CPTXYGraph alloc] initWithFrame:self.hostView.bounds];
[graph applyTheme:[CPTTheme themeNamed:kCPTDarkGradientTheme]];
self.hostView.hostedGraph = graph;
// 2 - Set graph title
NSString *title = [NSString stringWithFormat
"Altitude Plot [%@ to %@]", self.flightRecording.originAirport, self.flightRecording.destinationAirport];
graph.title = title;
// 3 - Create and set text style
CPTMutableTextStyle *titleStyle = [CPTMutableTextStyle textStyle];
titleStyle.color = [CPTColor whiteColor];
titleStyle.fontName = @"Helvetica-Bold";
titleStyle.fontSize = 16.0f;
graph.titleTextStyle = titleStyle;
graph.titlePlotAreaFrameAnchor = CPTRectAnchorTop;
graph.titleDisplacement = CGPointMake(0.0f, -20.0f);
// 4 - Set padding for plot area
float padding = 10.0f;
[graph.plotAreaFrame setPaddingLeft:padding];
[graph.plotAreaFrame setPaddingBottom:50.0f];
[graph.plotAreaFrame setPaddingRight:padding];
[graph.plotAreaFrame setPaddingTop:padding];
// 5 - Enable user interactions for plot space
altSpace= (CPTXYPlotSpace *) graph.defaultPlotSpace;
altSpace.allowsUserInteraction = NO;
rollSpace = [[CPTXYPlotSpace alloc] init];
rollSpace.allowsUserInteraction = NO;
[self.hostView.hostedGraph addPlotSpace:rollSpace];
//
// pitchSpace = [[CPTXYPlotSpace alloc] init];
// pitchSpace.allowsUserInteraction = NO;
// [self.hostView.hostedGraph addPlotSpace:pitchSpace];
//
//
// slipSpace = [[CPTXYPlotSpace alloc] init];
// slipSpace.allowsUserInteraction = NO;
// [self.hostView.hostedGraph addPlotSpace:slipSpace];
//
//
// gSpace = [[CPTXYPlotSpace alloc] init];
// gSpace.allowsUserInteraction = NO;
// [self.hostView.hostedGraph addPlotSpace:gSpace];
}
- (void)configurePlots {
// 1 - Get graph and plot space
CPTGraph *graph = self.hostView.hostedGraph;
// 2 - Create the three plots
// Custom AHRS Plot
CPTScatterPlot *ahrsAltPlot = [[CPTScatterPlot alloc] init];
ahrsAltPlot.dataSource = self;
ahrsAltPlot.identifier = @"AHRSALT";
CPTColor *ahrsAltColor = [CPTColor yellowColor];
[graph addPlot:ahrsAltPlot toPlotSpace:altSpace];
CPTScatterPlot *rollPlot = [[CPTScatterPlot alloc] init];
rollPlot.dataSource = self;
rollPlot.identifier = @"ROLL";
CPTColor *rollColor = [CPTColor greenColor];
[graph addPlot:rollPlot toPlotSpace:rollSpace];
// 3 - Set up plot space
CPTMutablePlotRange *xRange = [altSpace.xRange mutableCopy];
xRange=[CPTMutablePlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f ) length:CPTDecimalFromFloat(maxEpoch + 300.0f )];
// [xRange expandRangeByFactor:CPTDecimalFromCGFloat(1.1f)];
altSpace.xRange = xRange;
CPTMutablePlotRange *yRange = [altSpace.yRange mutableCopy];
yRange = [CPTMutablePlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(maxAlt)];
[yRange expandRangeByFactor:CPTDecimalFromCGFloat(1.2f)];
altSpace.yRange = yRange;
rollSpace.xRange = xRange;
CPTMutablePlotRange *yRangeRoll =[CPTMutablePlotRange plotRangeWithLocation:CPTDecimalFromFloat(0 ) length:CPTDecimalFromFloat(40 )];
[yRangeRoll expandRangeByFactor:CPTDecimalFromCGFloat(1.2f)];
rollSpace.yRange = yRangeRoll;
[altSpace scaleToFitPlots:[NSArray arrayWithObjects:ahrsAltPlot, nil] ];
[rollSpace scaleToFitPlots:[NSArray arrayWithObjects:rollPlot, nil] ];
[rollSpace setYRange:yRangeRoll];
// 4 - Create styles and symbols
// AHRS Style
CPTMutableLineStyle *ahrsLineStyle = [ahrsAltPlot.dataLineStyle mutableCopy];
ahrsLineStyle.lineWidth = 2.5;
ahrsLineStyle.lineColor = [CPTColor blueColor];
ahrsAltPlot.dataLineStyle = ahrsLineStyle;
}
- (void)configureAxes {
// 1 - Create styles
CPTMutableTextStyle *axisTitleStyle = [CPTMutableTextStyle textStyle];
axisTitleStyle.color = [CPTColor whiteColor];
axisTitleStyle.fontName = @"Helvetica-Bold";
axisTitleStyle.fontSize = 12.0f;
CPTMutableLineStyle *axisLineStyle = [CPTMutableLineStyle lineStyle];
axisLineStyle.lineWidth = 2.0f;
axisLineStyle.lineColor = [CPTColor whiteColor];
CPTMutableTextStyle *axisTextStyle = [[CPTMutableTextStyle alloc] init];
axisTextStyle.color = [CPTColor whiteColor];
axisTextStyle.fontName = @"Helvetica-Bold";
axisTextStyle.fontSize = 11.0f;
CPTMutableLineStyle *tickLineStyle = [CPTMutableLineStyle lineStyle];
tickLineStyle.lineColor = [CPTColor whiteColor];
tickLineStyle.lineWidth = 2.0f;
CPTMutableLineStyle *gridLineStyle = [CPTMutableLineStyle lineStyle];
tickLineStyle.lineColor = [CPTColor blackColor];
tickLineStyle.lineWidth = 1.0f;
// 2 - Get axis set
CPTXYAxisSet *axisSet = (CPTXYAxisSet *) self.hostView.hostedGraph.axisSet;
// 3 - Configure x-axis
CPTAxis *x = axisSet.xAxis;
x.title = @"Flight Time";
x.titleTextStyle = axisTitleStyle;
x.titleOffset = 15.0f;
x.axisLineStyle = axisLineStyle;
x.labelingPolicy = CPTAxisLabelingPolicyNone;
x.labelTextStyle = axisTextStyle;
x.majorTickLineStyle = axisLineStyle;
x.majorTickLength = 4.0f;
x.tickDirection = CPTSignNegative;
NSMutableSet *xLabels = [NSMutableSet new];
NSMutableSet *xLocations = [NSMutableSet new];
NSInteger i = 0;
for (i; i < maxEpoch; i += 600) {
int hour = i / (68 * 60);
int min = i / 60;
CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:[NSString stringWithFormat"%02d:%02d", hour, min] textStyle:x.labelTextStyle];
CGFloat location = i++;
label.tickLocation = CPTDecimalFromCGFloat(location);
label.offset = x.majorTickLength;
if (label) {
[xLabels addObject:label];
[xLocations addObject:[NSNumber numberWithInteger:i]];
}
}
x.axisLabels = xLabels;
x.majorTickLocations = xLocations;
// 4 - Configure y-axis
CPTAxis *y = axisSet.yAxis;
y.title = @"Altitude in Feet";
y.titleTextStyle = axisTitleStyle;
y.titleOffset = 20.0f;
y.axisLineStyle = axisLineStyle;
y.majorGridLineStyle = gridLineStyle;
y.labelingPolicy = CPTAxisLabelingPolicyNone;
y.labelTextStyle = axisTextStyle;
y.labelOffset = 21.0f;
y.majorTickLineStyle = axisLineStyle;
y.majorTickLength = 20.0f;
y.minorTickLength = 10.0f;
y.tickDirection = CPTSignNegative;
// Axis #2
CPTXYAxis *yRoll = [[CPTXYAxis alloc] init];
yRoll.title = @"Degrees";
// Styling
yRoll.titleTextStyle = axisTitleStyle;
yRoll.labelTextStyle = axisTextStyle;
yRoll.axisLineStyle = axisLineStyle;
yRoll.majorTickLineStyle = axisLineStyle;
yRoll.plotSpace = rollSpace;
yRoll.delegate = self;
yRoll.labelingPolicy = CPTAxisLabelingPolicyNone;
yRoll.coordinate = CPTCoordinateY;
yRoll.tickDirection = CPTSignNone;
yRoll.separateLayers = NO;
yRoll.tickDirection = CPTSignNegative;
yRoll.labelOffset = 21.0f;
yRoll.axisConstraints = [CPTConstraints constraintWithLowerOffset:40.0];
yRoll.orthogonalCoordinateDecimal = CPTDecimalFromFloat(0.0f);
NSMutableSet *rollLabels = [NSMutableSet new];
NSMutableSet *rollLocations = [NSMutableSet new];
for (int i =0; i <= 40; i+= 5) {
CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:[NSString stringWithFormat"%02d˚", (i - 20)] textStyle:yRoll.labelTextStyle];
CGFloat location = i;
label.tickLocation = CPTDecimalFromCGFloat(location);
label.offset = -16.0f;
if (label) {
[rollLabels addObject:label];
[rollLocations addObject:[NSNumber numberWithInteger:i]];
}
}
yRoll.axisLabels = rollLabels;
yRoll.majorTickLocations = rollLocations;
NSInteger majorIncrement = 500;
NSInteger minorIncrement = 100;
CGFloat yMax = maxAlt; // should determine dynamically based on max price
NSMutableSet *yLabels = [NSMutableSet set];
NSMutableSet *yMajorLocations = [NSMutableSet set];
NSMutableSet *yMinorLocations = [NSMutableSet set];
for (NSInteger j = minorIncrement; j <= yMax; j += minorIncrement) {
NSUInteger mod = j % majorIncrement;
if (mod == 0) {
CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:[NSString stringWithFormat"%i ft", 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)]];
}
}
// Position the y2 axis
// y2.axisConstraints = [CPTConstraints constraintWithUpperOffset:40.0];
axisSet.yAxis.axisConstraints = [CPTConstraints constraintWithUpperOffset:40.0];
y.axisLabels = yLabels;
y.majorTickLocations = yMajorLocations;
y.minorTickLocations = yMinorLocations;
self.hostView.hostedGraph.axisSet.axes = [NSArray arrayWithObjects:x,y,yRoll,nil];
// Position floating YAxis
// y2.axisConstraints = [CPTConstraints constraintWithUpperOffset:150.0];
}
编辑::
我尝试添加以下几行，但它们也没有做任何事情
y.orthogonalCoordinateDecimal = CPTDecimalFromFloat(0.0f);
x.orthogonalCoordinateDecimal = CPTDecimalFromFloat(0.0f);
实际上我似乎正在取得进展:似乎如果我删除
yAxis2.axisConstraints = [CPTConstraints constraintWithLowerOffset:40.0];
然后我的轴实际上现在似乎固定到 x 轴(虽然它不在屏幕上)，但它是一个开始。
Best Answer-推荐答案
问题已解决:
我有一些相互矛盾的指令。
为了实现我所需要的，我不得不使用这两个调用:
yAxis2.orthogonalCoordinateDecimal = CPTDecimalFromFloat(0.0f);
y.orthogonalCoordinateDecimal = CPTDecimalFromFloat(maxEpoch); // maximum X value
x.orthogonalCoordinateDecimal = CPTDecimalFromFloat(0.0f);
然后为了确保可以正确看到所有内容，我不得不使用填充值:
float padding = 50.0f;
[graph.plotAreaFrame setPaddingLeft:padding];
[graph.plotAreaFrame setPaddingBottom:50.0f];
[graph.plotAreaFrame setPaddingRight:padding];
[graph.plotAreaFrame setPaddingTop:padding];
而且我必须移除所有会搞砸事情的约束:
// yAxis2.axisConstraints = [CPTConstraints constraintWithLowerOffset:40.0];
// y.axisConstraints = [CPTConstraints constraintWithUpperOffset:150.0];
关于ios - Core-Plot 多 y 轴对齐问题 - 可能与缩放有关，我们在Stack Overflow上找到一个类似的问题：
https://stackoverflow.com/questions/22690821/
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