Core plot - start origin of graph at (0,0)

If you see the picture below, what I want is for the graph to 开发者_JAVA技巧start at 0 on the y axis and 6/28 on the x axis. How can I do this using core data? I can't find a way anywhere.

Both these values are 0 for each axis, so why doesn't the graph start at 0?

Plus I don't want negative values or dates.

I want it to start from a corner, like normal graphs. |_

Thanks for your help.

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I am not an expert in CorePlot but try setting the visibleRange and gridLinesRange on the x and y CPXYAxis. Something like this:

CPXYAxisSet *axisSet = (CPXYAxisSet *)self.axisSet;     // self is of type CPXYGraph

CPXYAxis *x = axisSet.xAxis;
x.visibleRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0.0f) length:CPDecimalFromFloat(xMax)];
x.gridLinesRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0.0f) length:CPDecimalFromFloat(yMax-1)];

CPXYAxis *y = axisSet.yAxis;
y.visibleRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0.0f) length:CPDecimalFromFloat(yMax - 1.0f)];
y.gridLinesRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0.0f) length:CPDecimalFromFloat(xMax)];

// Set axes
self.axisSet.axes = [NSArray arrayWithObjects:x, y, nil];

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Ah! found it

You have to set:

x.orthogonalCoordinateDecimal = CPDecimalFromString(@"0");
y.orthogonalCoordinateDecimal = CPDecimalFromString(@"0");

:)

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While I am searching for the solution of similar problem. I realise "CPDecimalFromFloat" is invalid . Later on Found out that CPDecimalFromFloat no longer there but I can use "CPTDecimalFromFloat".