Introducing geometric objects

Geometric objects are elements that we mark on the plot. One can use the geometric object in ggplot2 to create either a line, bar, or box chart. Moreover, one can integrate these simple geometric objects and aesthetic mapping to create a more professional plot. In this recipe, we introduce how to use geometric objects to create various charts.

Getting ready

Ensure you have completed the previous steps by storing sample_sum in your R environment.

How to do it…

Perform the following steps to create a geometric object in ggplot2:

1. First, create a scatterplot with the geom_point function:

   > g <- ggplot(data=sample_sum, mapping=aes(x=Year_Month, y=Total_Sales, col=Province )) + ggtitle('Scatter Plot')
   > g + geom_point() 
   

2. Use the geom_line function to plot a line chart:

   > g+ geom_line(linetype="dashed")
   

   

   Figure 9: Scatterplot and dashed line chart

3. Use the geom_bar function to make a stack bar chart:

   > g+geom_bar(stat = "identity", aes(fill=Province) , position...