Sets the current font matrix to a scale by a factor of size, replacing
any font matrix previously set with cairo.context.Context.setFontSize or
cairo.context.Context.setFontMatrix. This results in a font size of size user space
units. (More precisely, this matrix will result in the font's
em-square being a size by size square in user space.)
Sets the current font matrix to a scale by a factor of size, replacing any font matrix previously set with cairo.context.Context.setFontSize or cairo.context.Context.setFontMatrix. This results in a font size of size user space units. (More precisely, this matrix will result in the font's em-square being a size by size square in user space.)
If text is drawn without a call to cairo.context.Context.setFontSize, (nor cairo.context.Context.setFontMatrix nor cairo.context.Context.setScaledFont), the default font size is 10.0.