.drawLine() issues and buffered image

Question

I have a paint programme and i have all the buttons and sliders done however i am having a problem with the actual painting itself. When I drag the cursor across the scre

Answer 1

If I'm understanding your problem correctly, the major issue you are going to have is the number of updates you will receive when the mouse is dragged.

Even if you drag slowly, you will not always be notified of EVERY pixel movement, instead the system waits for a "idle" state (or threshold) to notify you so it "appears" to be a smooth movement.

I was able to put this together by modifying your code slightly

private MouseAdapter mouseListener =
    new MouseAdapter() {
        private boolean paint = false;
        @Override
        public void mousePressed(MouseEvent me) {

            xClicked = me.getX();
            yClicked = me.getY();
            xDragged = xClicked;
            yDragged = yClicked;

            paint = true;

        }

        @Override
        public void mouseReleased(MouseEvent e) {

            xClicked = -1;
            xClicked = -1;
            xDragged = -1;
            yDragged = -1;

            paint = false;

        }

        @Override
        public void mouseMoved(MouseEvent me) {
        }

        @Override
        public void mouseDragged(MouseEvent me) {

            if (paint) {

                xClicked = xDragged;
                yClicked = yDragged;

                xDragged = me.getX();
                yDragged = me.getY();

                xDragged = me.getX();
                yDragged = me.getY();

                Graphics2D g2 = bImage.createGraphics();
                g2.setColor(Color.WHITE);
                g2.drawLine(xClicked, yClicked, xDragged, yDragged);
                g2.dispose();
                imageLabel.setIcon(new ImageIcon(bImage));

                me.getComponent().invalidate();
                me.getComponent().repaint();

            }

        }
    };

Basically, the idea is to draw a line from the last "known location" to the current location.

Hope this is in the ball park