Question

I saw some Core-plot sample. Is there anything equivalent that will do my task easily? I also want to know feasibility with Core-plot in iPhone. (any issues with core-plot)

I want to have multi-colored vertical bar chart. Is it possible to customize Core-plot framework. Using only one barplot can we have multiple segment on it.

Thank you.
Naveen Thunga

Answer 1

To make a stacked bar plot, you need to make multiple plots, one for each segment. On all but the bottom plot, set barBasesVary to YES. The datasource will ask for a third field called CPTBarPlotFieldBarBase which is the base value for the bar. You will have to do the stacking calculations yourself.

The horizontal lines can be drawn using an additional bar plot. Give the bars a short height (tip – base). You can make the width wider than the others if you want–each plot is independent.

The space between the bars depends on several factors. By default, bar widths are specified in data coordinates. For example, if the bar locations are one unit apart, a bar width of 0.5 will make the bar width and the space between the bars equal; a bar width of 0.75 will make the space 1/3 of the bar width. The actual width in pixels depends on the size of the graph and how many bars are visible (determined by the plot range along that axis). If barWidthsAreInViewCoordinates is YES, then bar widths are given in pixels which keeps them the same apparent width as the plot range changes, but the space between them will change with the plot range.