ios - Core-Plot 多 y 轴对齐问题 - 可能与缩放有关
<p><p>我的问题如下:</p>
<p>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)。</p>
<p>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:</p>
<pre><code>- (void)initPlot {
;
;
;
;
;
}
- (void)configureHost {
self.hostView = [(CPTGraphHostingView *) initWithFrame:self.view.bounds];
self.hostView.allowPinchScaling = YES;
;
}
- (void)configureGraph {
// 1 - Create the graph
CPTGraph *graph = [ initWithFrame:self.hostView.bounds];
];
self.hostView.hostedGraph = graph;
// 2 - Set graph title
NSString *title = ", self.flightRecording.originAirport, self.flightRecording.destinationAirport];
graph.title = title;
// 3 - Create and set text style
CPTMutableTextStyle *titleStyle = ;
titleStyle.color = ;
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;
;
;
;
;
// 5 - Enable user interactions for plot space
altSpace= (CPTXYPlotSpace *) graph.defaultPlotSpace;
altSpace.allowsUserInteraction = NO;
rollSpace = [ init];
rollSpace.allowsUserInteraction = NO;
;
//
// pitchSpace = [ init];
// pitchSpace.allowsUserInteraction = NO;
// ;
//
//
// slipSpace = [ init];
// slipSpace.allowsUserInteraction = NO;
// ;
//
//
// gSpace = [ init];
// gSpace.allowsUserInteraction = NO;
// ;
}
- (void)configurePlots {
// 1 - Get graph and plot space
CPTGraph *graph = self.hostView.hostedGraph;
// 2 - Create the three plots
// Custom AHRS Plot
CPTScatterPlot *ahrsAltPlot = [ init];
ahrsAltPlot.dataSource = self;
ahrsAltPlot.identifier = @"AHRSALT";
CPTColor *ahrsAltColor = ;
;
CPTScatterPlot *rollPlot = [ init];
rollPlot.dataSource = self;
rollPlot.identifier = @"ROLL";
CPTColor *rollColor = ;
;
// 3 - Set up plot space
CPTMutablePlotRange *xRange = ;
xRange=;
// ;
altSpace.xRange = xRange;
CPTMutablePlotRange *yRange = ;
yRange = ;
;
altSpace.yRange = yRange;
rollSpace.xRange = xRange;
CPTMutablePlotRange *yRangeRoll =;
;
rollSpace.yRange =yRangeRoll;
];
];
;
// 4 - Create styles and symbols
// AHRS Style
CPTMutableLineStyle *ahrsLineStyle = ;
ahrsLineStyle.lineWidth = 2.5;
ahrsLineStyle.lineColor = ;
ahrsAltPlot.dataLineStyle = ahrsLineStyle;
}
- (void)configureAxes {
// 1 - Create styles
CPTMutableTextStyle *axisTitleStyle = ;
axisTitleStyle.color = ;
axisTitleStyle.fontName = @"Helvetica-Bold";
axisTitleStyle.fontSize = 12.0f;
CPTMutableLineStyle *axisLineStyle = ;
axisLineStyle.lineWidth = 2.0f;
axisLineStyle.lineColor = ;
CPTMutableTextStyle *axisTextStyle = [ init];
axisTextStyle.color = ;
axisTextStyle.fontName = @"Helvetica-Bold";
axisTextStyle.fontSize = 11.0f;
CPTMutableLineStyle *tickLineStyle = ;
tickLineStyle.lineColor = ;
tickLineStyle.lineWidth = 2.0f;
CPTMutableLineStyle *gridLineStyle = ;
tickLineStyle.lineColor = ;
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 *xLocations = ;
NSInteger i = 0;
for (i; i < maxEpoch; i += 600) {
int hour = i / (68 * 60);
int min = i / 60;
CPTAxisLabel *label = [ initWithText: textStyle:x.labelTextStyle];
CGFloat location = i++;
label.tickLocation = CPTDecimalFromCGFloat(location);
label.offset = x.majorTickLength;
if (label) {
;
];
}
}
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 = [ 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 = ;
yRoll.orthogonalCoordinateDecimal = CPTDecimalFromFloat(0.0f);
NSMutableSet *rollLabels = ;
NSMutableSet *rollLocations = ;
for (int i =0; i <= 40; i+= 5) {
CPTAxisLabel *label = [ initWithText: textStyle:yRoll.labelTextStyle];
CGFloat location = i;
label.tickLocation = CPTDecimalFromCGFloat(location);
label.offset = -16.0f;
if (label) {
;
];
}
}
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 *yMajorLocations = ;
NSMutableSet *yMinorLocations = ;
for (NSInteger j = minorIncrement; j <= yMax; j += minorIncrement) {
NSUInteger mod = j % majorIncrement;
if (mod == 0) {
CPTAxisLabel *label = [ initWithText: textStyle:y.labelTextStyle];
NSDecimal location = CPTDecimalFromInteger(j);
label.tickLocation = location;
label.offset = -y.majorTickLength - y.labelOffset;
if (label) {
;
}
];
} else {
];
}
}
// Position the y2 axis
// y2.axisConstraints = ;
axisSet.yAxis.axisConstraints = ;
y.axisLabels = yLabels;
y.majorTickLocations = yMajorLocations;
y.minorTickLocations = yMinorLocations;
self.hostView.hostedGraph.axisSet.axes = ;
// Position floating YAxis
// y2.axisConstraints = ;
}
</code></pre>
<p> <img src="/image/J7h6B.png" alt="enter image description here"/> </p>
<p>编辑::</p>
<p>我尝试添加以下几行，但它们也没有做任何事情</p>
<pre><code>y.orthogonalCoordinateDecimal = CPTDecimalFromFloat(0.0f);
x.orthogonalCoordinateDecimal = CPTDecimalFromFloat(0.0f);
</code></pre>
<p>实际上我似乎正在取得进展:似乎如果我删除</p>
<pre><code>yAxis2.axisConstraints = ;
</code></pre>
<p>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。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>问题已解决:</p>
<p>我有一些相互矛盾的指令。</p>
<p>为了实现我所需要的，我不得不使用这两个调用:</p>
<pre><code>yAxis2.orthogonalCoordinateDecimal = CPTDecimalFromFloat(0.0f);
y.orthogonalCoordinateDecimal = CPTDecimalFromFloat(maxEpoch); // maximum X value
x.orthogonalCoordinateDecimal = CPTDecimalFromFloat(0.0f);
</code></pre>
<p>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:</p>
<pre><code>float padding = 50.0f;
;
;
;
;
</code></pre>
<p>而且我必须移除所有会搞砸事情的约束:</p>
<pre><code>// yAxis2.axisConstraints = ;
// y.axisConstraints = ;
</code></pre>
<p> <img src="/image/Jkuud.png" alt="enter image description here"/> </p></p>
<p style="font-size: 20px;">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：
<a href="https://stackoverflow.com/questions/22690821/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/22690821/
</a>
</p>
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