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Trend Lines

Trend lines are straight lines from one given category / value axis point to another. Trend lines are used to indicate the general changes over time, also as technical indicators in financial charts. In case you need a possibility to allow your users draw the trend lines, check this Stock Chart example.

Infinite fills or lines

For infinite lines or fills, crossing all plot area without start/end horizontally or vertically (notice the horizontal fill from 10 to 16), you can use Guides.

Demo source