How to improve the speed of drawing

raymenlv

I found that the drawing speed is very slow whether it is using API or other methods


Is there any way to improve

cooler42

First draw in the memory, and then copy the whole to the control to be displayed.

raymenlv

cooler42Show me some code

zeta98

It depends on what the host is doing. It is used to draw waveforms, and GDI is quite fast for small changes in the image.
If you want to redraw the entire frame on a large scale, it seems you need to use DirectDraw or OpenGL. But I don’t even say it, just check the data and you will be able to draw soon.

raymenlv

I'm even drawing a waveform graph

zhongshuan

It seems that the delphi box has a code, you can find it, I remember it was not sent long ago

addforever

OpenGL
D3D
You can directly operate the graphics card, faster
It's quite possible to draw waveform graphs with normal API speed

raymenlv

It's quite possible to draw waveform graphs with normal API speed

>>

No way, mine is about to be 1MS. It has to drop a lot.

addforever

1MS requirements are a bit high, but it is also possible to draw nearly 10,000 straight lines. Is 10,000 straight lines not enough to display a waveform?
Besides, what do you want to do so fast? Every 40 milliseconds is considered continuous by the human eye.

felix3325

1ms is not necessary