核心情节：RealTimePlot - 放置静态 yAxis

Question

我的问题是我不能在我的 RealTimePlot 示例中放置静态 yAxis（不移动）。 在移动过程中，xAxis 是静态的，但 yAxis 会消失。

我的代码是：

-(void)renderInLayer:(CPTGraphHostingView *)layerHostingView withTheme:(CPTTheme *)theme
{

    graph = [[[CPTXYGraph alloc] initWithFrame:bounds] autorelease];
    layerHostingView.hostedGraph = graph;

    graph.plotAreaFrame.paddingTop    = 15.0;
    graph.plotAreaFrame.paddingRight  = 15.0;
    graph.plotAreaFrame.paddingBottom = 55.0;
    graph.plotAreaFrame.paddingLeft   = 55.0;

    // Axes
    // X axis
    CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
    CPTXYAxis *x          = axisSet.xAxis;
    x.labelingPolicy              = CPTAxisLabelingPolicyAutomatic;
    x.orthogonalCoordinateDecimal = CPTDecimalFromUnsignedInteger(0);
    x.minorTicksPerInterval       = 9;
    x.title                       = @"X Axis";
    x.titleOffset                 = 35.0;

    // Y axis
    CPTXYAxis *y = axisSet.yAxis;
    y.labelingPolicy              = CPTAxisLabelingPolicyAutomatic;
    y.orthogonalCoordinateDecimal = CPTDecimalFromUnsignedInteger(0);
    y.minorTicksPerInterval       = 3;
    y.labelOffset                 = 5.0;
    y.title                       = @"Y Axis";
    y.titleOffset                 = 30.0;

    y.constraints = CPTMakeConstraints(CPTConstraintNone, CPTConstraintFixed);

    // Rotate the labels by 45 degrees, just to show it can be done.
    x.labelRotation = M_PI * 0.25;

    // Create the plot
    CPTScatterPlot *dataSourceLinePlot = [[[CPTScatterPlot alloc] init] autorelease];
    dataSourceLinePlot.identifier     = kPlotIdentifier;
    dataSourceLinePlot.cachePrecision = CPTPlotCachePrecisionDouble;

    CPTMutableLineStyle *lineStyle = [[dataSourceLinePlot.dataLineStyle mutableCopy] autorelease];
    lineStyle.lineWidth              = 3.0;
    lineStyle.lineColor              = [CPTColor greenColor];
    dataSourceLinePlot.dataLineStyle = lineStyle;

    dataSourceLinePlot.dataSource = self;
    [graph addPlot:dataSourceLinePlot];

}

我的 CorePlot 版本是 1.0。

有什么想法吗？？

Answer 1

constraints 语法在 1.0 版本之前已更改。试试

y.axisConstraints = [CPTConstraints constraintWithLowerOffset:0.0];