核心情节定制主题? [英] core plot custom Theme?
问题描述
我在iPhone应用程序中使用Core-Plot作为趋势图,但还没有找到如何自定义背景。我可以使用内置主题创建主题,如kCPPlainWhiteTheme,但我该如何更改它们?或者创建一个新的?
I'm using Core-Plot for a trend chart in an iPhone app and haven't found how to customize the background. I can create a theme using the built-in themes, like kCPPlainWhiteTheme, but how can I change them? or create a new one?
我基本上需要做的是让背景透明化。
What i basically need to do is make the background transparent.
编辑/更新
我测试了这段代码,但它没有似乎工作:
I jus tested this code but it doesn't seem to work:
//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");
这里我设置了 CPXYGraph * chartTrend5 和 * CPXYPlotSpace * chartTrend5PlotSpace 为零。
推荐答案
除了Eric建议的,您还可以尝试设置填充到清晰的颜色。例如,我过去曾使用过这个来为图表提供透明背景:
In addition to what Eric suggests, you can also try setting the fill to a clear color. For example, I've used this in the past to provide a transparent background to graphs:
CPTTheme *theme = [CPTTheme themeNamed:kCPPlainWhiteTheme];
graph = (CPTXYGraph *)[theme newGraph];
graph.fill = [CPTFill fillWithColor:[CPTColor clearColor]];
graph.plotAreaFrame.fill = [CPTFill fillWithColor:[CPTColor clearColor]];
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