QT Draw Pixmap # QT Creator # Radar

Create Pixmap 

Step 1.
Create View

create view

check the width and height

Step 2.

Calculate Diameter and Center Point

Step 3.

Create Qt Project choose widget

Step 4. 

Create RadarScene

Structure

Step 5.

prepare RadarScene.h file

use QWidget

prepare function and parameter

Step 6.

prepare RadarScene.cpp file, Calculate diameter and center point

Step 7.

when called update() will execute paintEvent

Step 8.

paint Scene use Pixmap

return Pixmap

Step 9. 

Create Timer to update View use timeout() signal

View like this