我在iPhone应用程序中使用核心图来绘制趋势图,但还没有找到如何定制背景。我可以使用内置主题(如kCPPlainWhiteTheme )创建一个主题,但是如何更改它们呢?或者创造一个新的?
我主要需要做的是让背景变得透明。
编辑/更新
我测试了这段代码,但它似乎不起作用:
//CPTheme *theme = [CPTheme themeNamed:kCPPlainWhiteTheme];
CPTheme *theme = [[CPTheme alloc]init];
chartTrend5 = (CPXYGraph *)[theme newGraph];
chartView.hostedGraph = chartTrend5;
chartTrend5.paddingLeft = 0.0;
chartTrend5.paddingTop = 0.0;
chartTrend5.paddingRight = 0.0;
chartTrend5.paddingBottom = 0.0;
chartTrend5.fill = nil;
chartTrend5.borderLineStyle = nil;
chartView.hostedGraph.fill = nil;
chartTrend5PlotSpace = (CPXYPlotSpace *)chartTrend5.defaultPlotSpace;
chartTrend5PlotSpace.xRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0)
length:CPDecimalFromFloat(5)];
// range is 0-125, but since the frame heights is 90,
// we need to convert the points to this adjusted scale. The factor is 0.72 => (90/125)
chartTrend5PlotSpace.yRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0)
length:CPDecimalFromFloat(90)];
CPXYAxisSet *axisSet = (CPXYAxisSet *)chartTrend5.axisSet;
CPXYAxis *x = axisSet.xAxis;
x.majorIntervalLength = CPDecimalFromFloat(100);
//x.constantCoordinateValue = CPDecimalFromFloat(2);
x.minorTicksPerInterval = 2;
x.borderWidth = 0;
x.labelExclusionRanges = [NSArray arrayWithObjects:
[CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-1)
length:CPDecimalFromFloat(800)],
nil];;
CPXYAxis *y = axisSet.yAxis;
y.majorIntervalLength = CPDecimalFromFloat(100);
y.minorTicksPerInterval = 1;
//y.constantCoordinateValue = length:CPDecimalFromFloat(2);
y.labelExclusionRanges = [NSArray arrayWithObjects:
[CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-26)
length:CPDecimalFromFloat(100)],
nil];
CPScatterPlot *dataSourceLinePlot = [[[CPScatterPlot alloc] init] autorelease];
dataSourceLinePlot.identifier = @"TrendChart";
dataSourceLinePlot.dataLineStyle.lineWidth = 2.f;
dataSourceLinePlot.dataLineStyle.lineColor = [CPColor colorWithComponentRed:(16/255.f)
green:(101/255.f)
blue:(122/255.f)
alpha:1];
dataSourceLinePlot.dataSource = self;
[chartTrend5 addPlot:dataSourceLinePlot];
chartTrend5.fill = nil;
// Put an area gradient under the plot above
CPColor *areaColor = [CPColor colorWithComponentRed:(212/255.f)
green:(233/255.f)
blue:(216/255.f)
alpha:1];
CPGradient *areaGradient = [CPGradient gradientWithBeginningColor:areaColor
endingColor:areaColor];
areaGradient.angle = -90.0f;
CPFill *areaGradientFill = [CPFill fillWithGradient:areaGradient];
dataSourceLinePlot.areaFill = areaGradientFill;
dataSourceLinePlot.areaBaseValue = CPDecimalFromString(@"5.25");在这里,我将CPXYGraph *chartTrend5和*CPXYPlotSpace *chartTrend5PlotSpace的fill属性设置为零。
发布于 2011-02-27 16:55:45
除了Eric的建议外,您还可以尝试将填充设置为清晰的颜色。例如,我过去曾使用它为图形提供透明的背景:
CPTTheme *theme = [CPTTheme themeNamed:kCPPlainWhiteTheme];
graph = (CPTXYGraph *)[theme newGraph];
graph.fill = [CPTFill fillWithColor:[CPTColor clearColor]];
graph.plotAreaFrame.fill = [CPTFill fillWithColor:[CPTColor clearColor]];发布于 2011-02-27 14:22:32
主题只是一种方便的方式,可以同时设置许多样式属性。您可以将其中任何一个单独设置为自定义外观。当您想要一个区域透明时,您可以将其填充设置为nil。与线条样式相同--将它们设置为nil以防止绘制一条线。
有两个“背景”领域,你可能会关注。图和绘图区域一样都有填充。地块区域是绘制地块的区域。将这两个方面的fill属性设置为nil,以使背景透明。
发布于 2012-07-24 08:49:05
我试过这个&它对我有用:
// Here 'hostingView' is your CPTGraphHostingView to
// which you add your graph
UIImageView *backgroundImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"background.png"]];
[hostingView addSubview:backgorundImage];
[hostingView sendSubviewToBack:backgroundImage];https://stackoverflow.com/questions/5132253
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