private void CalcChartVariables()
{
chartFirstCol = rulers[0].FirstCol();
chartLastCol = rulers[0].LastCol();
chartWidth = chartLastCol - chartFirstCol + 1;
rowFirst = 10;
rowLast = chartPanel.Height - 10;
int totalPixelRows = 1 + rowLast - rowFirst;
if ((minValues == null) || (maxValues == null))
{
history.CalcMinMaxValues(timeBot, timeTop);
minValues = history.MinValues();
maxValues = history.MaxValues();
}
colFactors = new float[minValues.Length];
for (int x = 0; x < minValues.Length; x++)
{
float range = maxValues[x] - minValues[x];
if (range == 0.0f)
{
colFactors[x] = 1.0f;
}
else
{
colFactors[x] = chartWidth / range;
}
}
TimeSpan timeRange = timeTop - timeBot;
int timeRangeSecs = (int)timeRange.TotalSeconds;
secsPerPixelRow = (float)timeRangeSecs / (float)totalPixelRows;
metersPerPixelRow = (float)(depthBot - depthTop) / (float)totalPixelRows;
if (plotBuffer != null)
{
plotBuffer.Dispose();
plotBuffer = null;
}
plotDC = chartPanel.CreateGraphics();
plotBuffer = new Bitmap(chartPanel.Width, chartPanel.Height);
plotBufferDC = Graphics.FromImage(plotBuffer);
} /* CalcChartVariables */
