How to force the x-axis tick marks to appear at the end of bar in heatmap graph?

I created a simple heatmap graph with **ggplot2** but I need to force the x-axis tick marks to appear at the end of my x variable, rather than at its center. For example, I would expect 1 to appear at the position of where 1.5 is now. I beleive a heatmap done in Base R would do that. library(car) #initialize libraries library(ggplot2) #initialize libraries library(reshape) df=read.table(text= "x y fill 1 1 B 2 1 A 3 1 B 1 2 A 2 2 C 3 2 A ", header=TRUE, sep="" ) #plot data qplot(x=x, y=y, fill=fill, data=df, geom="tile")+ scale_x_continuous(breaks=seq(1:3) ) ![enter image description here][1] The idea is to create a simple heatmap which looks like this: ![enter image description here][2] The tick marks in this graph are placed at the end of the bars instead of their centers [1]: http://i.stack.imgur.com/dd8XM.png [2]: http://i.stack.imgur.com/Xtf1c.png

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