How to draw a line with finger?

[Jack li1]

Hi,How can i draw a line on my display touchscreen with my finger.I have used Graph widget before,but the coordinate point must be monotone increasing。Could i use the method for QrCode，and could you write an example for this。Thanks�?�?�?

Best regards

[Martin KJELDSEN]

Hi @Jack li​,

You could create a custom widget (Like the QrCode) that hooks into the ::draw() method and simply draw into the framebuffer at the relative location of your finger (hook into ::handleClickEvent() and ::handleDragEvent() to get these coordinates. You will not have the antialiasing that the Graph gives you, but you have more freedom here.

Does that make sense?

Best regards,

Martin

[Jack li1]

😁

[Jack li1]

Hello,@Martin KJELDSEN​ 

Thanks for you help ,but i can understand that .First i can't understand how to use ::draw() method ,maybe on touchgfx.com have Tutorial,l can't find it.so could you tell me through the entire process step by step or how can i do this .

Thank you very much !!!!

Best regards

Jack li