Java - Custom shaped draggable JFrame

Question

so I made a custom shaped JFrame using setShape(s); and I got it to look how I wanted the problem when you set the JFrame to be undecorated you can\'t drag the Fram

Answer 1

1. You have to update initial coordinates at each drag.
2. evt.getX() gives coordinates relative to frame. You should use evt.getXOnScreen() in stead.

Replace

void updateFrameCoords(MouseEvent e) {
    int dx = e.getX() - initialPressedX;
    int dy = e.getY() - initialPressedY;
    for (int i = 0; i < OCTAGON_COORDS_X.length; i++) {
        OCTAGON_COORDS_X[i] += dx;
        OCTAGON_COORDS_Y[i] += dy;
    }
    updateFrame();
}

with

void updateFrameCoords(MouseEvent e) {
    int dx = e.getXOnScreen() - initialPressedX;
    int dy = e.getYOnScreen() - initialPressedY;
    for (int i = 0; i < OCTAGON_COORDS_X.length; i++) {
        OCTAGON_COORDS_X[i] += dx;
        OCTAGON_COORDS_Y[i] += dy;
    }
    updateFrame();
    initialPressedX = e.getXOnScreen();
    initialPressedY = e.getYOnScreen();
}

Same in mousePressed event.

Good luck.