I am using ofxGui.How can I rotate an ofxSlider(for example:ofxFloatSlider) into vertical position?
It is not possible at the moment.
You can try and make a new gui element. Just copy ofxSlider and change the relevant parts so it draws vertically (generateDraw(), render() and mouse interactions)
As well, the ofxGuiGroup or ofxPanel stacks elements vertically so you might need to modify these as well.
At the end it sound like a lot of work. You might want to try another gui addon that provides such option. Look at ofxaddons.com for other gui addons.
Ok,thanks for your answer.