Class PixelDecimator

java.lang.Object

com.arbergashi.charts.internal.PixelDecimator

public final class PixelDecimator
extends Object

Algorithm for data reduction for display purposes.

With very large datasets (e.g., 1 million points), it is inefficient to draw lines for every point when the screen is only 2000 pixels wide. The decimator reduces the data to min/max values per pixel column.

Since:

2025-06-01

Version:

1.0.0

Author:

Arber Gashi

Method Summary

Modifier and Type	Method	Description
static int	decimate(double[] xIn, double[] yIn, int count, PlotContext context, double[] outX, double[] outY)	Reduces the input data to approx. 2 points per pixel column (Min and Max).

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

decimate

public static int decimate(double[] xIn,
 double[] yIn,
 int count,
 PlotContext context,
 double[] outX,
 double[] outY)

Reduces the input data to approx. 2 points per pixel column (Min and Max).

Parameters:

xIn - Input X

yIn - Input Y

count - Number of points

context - PlotContext (for width)

outX - Output buffer (must be large enough, e.g., 4 * width)

outY - Output buffer

Returns:

Number of points in the output buffer