paint

(sorry for bad English) I have a big problem with performance of DataGridView when it re-paints. I'm using a DataGridView to show logs from an external application stream. Messages from the stream come in with a high frequency (less than 1 ms). If I add new row to the DataGridView immediately when each new message comes, the DataGridView doesn't have time to re-paint itself before the next message comes. A possible solution is to use a queue to collect messages and re-paint DataGridView every 100 ms with messages from queue. This is good but the DataGridView blinks when it auto-scrolls to the

I develop a custom view component for my application and I am struggling with adding a shadow to a circle. Here is the code of my class extending View public class ChartView extends View { public ChartView(Context context, AttributeSet attributeSet){ super(context, attributeSet); init(); } Paint paint; public void init(){ paint = new Paint(Paint.ANTI_ALIAS_FLAG); paint.setColor(Color.WHITE); paint.setStyle(Paint.Style.FILL); paint.setShadowLayer(30, 0, 0, Color.RED); } @Override protected void onDraw(Canvas canvas) { canvas.drawCircle(getWidth()/2, getHeight()/2,50, paint); } } However, I

I am writing an application which has a JLayeredPane (call it layers) containing two JPanels in different layers. I override the paintComponent method of the JPanel at the bottom (call it grid_panel) so it paints a grid, and the the paintComponent method of the one at the top (call it circuit_panel) so it paints a circuit. Here's a summary of the structure: layers - |-circuit_panel (on top) |-grid_panel (at bottom) I want the grid_panel to stay static, ie, not to do any repaint (except the initial one) since it does not change. The trouble is, whenever I call circuit_panel.repaint(), grid