This is really really good. I like it very much. Thank you for making this for free.

Hi, how can I easily delete objects or lines that I don't want to have drawn?

To click and drag i need to click twice with left button, is that correct? Thank you for your help. 

Hello,

Thank you for your question.

If you accidentally start drawing an object or line, you can move your mouse outside the chart area while dragging to cancel the drawing.

For existing objects, you can only move them back to their original position. A cancel feature might be convenient, and I will consider it for future updates.

You are almost correct regarding click and drag. To click and drag, press the left mouse button once to select, then press it again and hold while moving the mouse to drag the object.

If you have any further questions, feel free to ask.

Best regards,