- click left mouse button on different tools and colours
- pencil tool drawing with selected colour by holding/clicking left mouse button
- eraser tool erasing by holding/clicking left mouse button
- fill tool fills space with selected colour by clicking left mouse button
- line tool draws line from starting point to ending point in selected colour by holding left mouse button
- rectangle tool draws rectangle from starting point to ending point in selected colour by holding left mouse button
- colour selector tool changes selected colour to colour clicked on by left mouse button
- selector tool not properly implemented yet
- save tool saves currently drawn image as png file