Fast Line Drawing Mode

[Biehrer]

• Implement a fast line drawing mode: This mode should reduce the number of lines drawn without affecting the chart appearance.

Problem:
The plot area width is usually a few to 1920 pixels.
For a sweep chart, which flows from the left to the right screen border, if there are a lot more data points (eg. 10k data points, when using a timerange of 10 seconds and a signal with a frequency of 1 kHz) than the plot area pixel width, many of the points are drawn at the same x-pixel coordinate.

What is visible at each x-pixel position is a vertical line, which connects the minimum point and the maximum point at the x-pixel-position.

TODO:
Implement fast line drawing mode, which automatically detects that there are too many points at the same x-pixel coordinate, and draws only a line segment joining the extreme points(min and max) at that coordinate. The resulting line should be visually indistinguishable from a line in which the line segments join all data points.