com.netflix.atlas.chart.graphics.TimeSeriesArea.scala Maven / Gradle / Ivy
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/*
* Copyright 2014-2024 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.netflix.atlas.chart.graphics
import java.awt.Graphics2D
import com.netflix.atlas.core.model.TimeSeq
/**
* Draws a time series as an area filled to zero. If values are positive the fill will be down to
* zero. If values are negative the fill will be up to zero.
*
* @param style
* Style to use for drawing the area.
* @param ts
* Data for the line.
* @param xaxis
* Axis used to create the X scale.
* @param yaxis
* Axis used to create the Y scale.
*/
case class TimeSeriesArea(style: Style, ts: TimeSeq, xaxis: TimeAxis, yaxis: ValueAxis)
extends Element {
def draw(g: Graphics2D, x1: Int, y1: Int, x2: Int, y2: Int): Unit = {
style.configure(g)
val step = ts.step
val xscale = xaxis.scale(x1, x2)
val yscale = yaxis.scale(y1, y2)
val axisy = yscale(0.0)
var t = xaxis.start
var py = yscale(ts(t))
while (t < xaxis.end) {
val px1 = xscale(t - step)
val px2 = xscale(t)
val nv = ts(t)
val ny = yscale(nv)
val py1 = math.min(axisy, ny)
val py2 = math.max(axisy, ny) + 1
if (!nv.isNaN) g.fillRect(px1, py1, px2 - px1, py2 - py1)
t += step
py = ny
}
}
}