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I have the following initial situation: I have made the colour and shape of the points in a scatter plot dependent on the same variable. But because the points overlap, you can't see the individual data points very well, so I need a line.

My problem: I can't manage to give the different shapes an outer line in black without the colour of the whole point/traingle changing completely.

Here is my code, does anyone have any ideas?

ggplot(mydata, aes_string(x = "metric_var1", y = "metric_var2", shape = "categ_var"))+ geom_point(aes(colour = categ_var), size = 3)+ scale_colour_manual(values=c("#13678A", "#FFD579"))
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You need to use a shape for geom_point() that has a border, i.e. shapes 21-24. The border is controled by the aesthetics color and stroke, the inside by fill and size.

ggplot(mydata, aes_string(x = "metric_var1", y = "metric_var2", shape = "categ_var")) + geom_point(aes(fill = categ_var), color = "black", size = 3) + scale_fill_manual(values=c("#13678A", "#FFD579")) + scale_shape_manual(values=21:22)
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