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copied!<p>You may try to change the problem slightly.</p> <p>Since you do not know how long your painting will take, you cannot make an assumption about that.</p> <p>What you do know, is the amount of time you want the transition to happen, let's say 30 seconds, something like this:</p> <pre><code>private MAX_TRANSITION_TIME = 30; //seconds </code></pre> <p>At this point you can also track the amount of time it has elapsed since the start of your operation, by recording when your operation has started, let's say </p> <pre><code>private DateTime _startMoment; </code></pre> <p>Now what you can do is to make sure you have the right routine at hand and you calculate your position based on the difference between the startMoment and now</p> <pre><code>var elapsedTime = DateTime.Now.Subtract(_startMoment).Milliseconds; var elapsedPercent = elapsedTime / MAX_TRANSITION_TIME * 1000.0 ; </code></pre> <p>From now on what you can do is to paint accordingly to your percent of time elapsed.</p> <p>So after your OnPaint is done you should be able to refresh it. If you use one UI timer, you can do this:</p> <pre><code> private void onPaint(object sender, PaintEventArgs e) { Timer1.Enabled = false; //350 lines of (adjusted)code go here If (ElapsedPercent<1) { Timer1.Enabled=True; } else { // you may need to perform the last draw setting the ElapsedPercent // to 1. This is because it is very unlikely that your // last call will happen at the very last millisecond } } </code></pre> <p>Where Timer1 has to be the Timer control.</p> <p>In the Interval event you just write</p> <pre><code> _startMoment = DateTime.Now(); this.Invalidate(); </code></pre> <p>Hope this helps</p>

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