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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.chart.model.DataDef
import com.netflix.atlas.chart.model.LineDef
import com.netflix.atlas.chart.model.MessageDef
import com.netflix.atlas.chart.model.PlotDef
import com.netflix.atlas.chart.model.TickLabelMode
import com.netflix.atlas.core.util.UnitPrefix
/**
* Draws a legend entry for a line.
*
* @param styles
* Styles for elements on the legend entry.
* @param plot
* Definition for the plot containing the line.
* @param data
* Definition for the data element.
* @param showStats
* If true then summary stats will be shown below the label for the line.
*/
case class LegendEntry(styles: Styles, plot: PlotDef, data: DataDef, showStats: Boolean)
extends Element
with FixedHeight {
private def shouldShowStats: Boolean = showStats && data.isInstanceOf[LineDef]
override def height: Int = {
if (!shouldShowStats) ChartSettings.normalFontDims.height
else {
ChartSettings.normalFontDims.height + ChartSettings.smallFontDims.height * 3
}
}
override def draw(g: Graphics2D, x1: Int, y1: Int, x2: Int, y2: Int): Unit = {
if (data.isInstanceOf[MessageDef]) {
// Draw the label
val txt = Text(data.label, style = Style(data.color), alignment = TextAlignment.LEFT)
val truncated = txt.truncate(x2 - x1)
truncated.draw(g, x1, y1, x2, y2)
} else {
val d = ChartSettings.normalFontDims.height - 4
// Draw the color box for the legend entry. If the color has an alpha setting, then the
// background can impact the color so we first fill with the background color of the chart.
g.setColor(styles.background.color)
g.fillRect(x1 + 2, y1 + 2, d, d)
g.setColor(data.color)
g.fillRect(x1 + 2, y1 + 2, d, d)
// Border for the color box
styles.line.configure(g)
g.drawRect(x1 + 2, y1 + 2, d, d)
// Draw the label
val txt = Text(data.label, alignment = TextAlignment.LEFT, style = styles.text)
val truncated = txt.truncate(x2 - x1 - d - 4)
truncated.draw(g, x1 + d + 4, y1, x2, y2)
data match {
case line: LineDef if showStats =>
val stats = line.legendStats
val max = format(stats.max)
val min = format(stats.min)
val avg = format(stats.avg)
val last = format(stats.last)
val total = format(stats.total)
val count = format(stats.count, false)
val rows = List(
" Max : %-11s Min : %-11s".format(max, min),
" Avg : %-11s Last : %-11s".format(avg, last),
" Tot : %-11s Cnt : %-11s".format(total, count)
)
val offset = y1 + ChartSettings.normalFontDims.height
val rowHeight = ChartSettings.smallFontDims.height
rows.zipWithIndex.foreach {
case (row, i) =>
val txt = Text(
row,
font = ChartSettings.smallFont,
alignment = TextAlignment.LEFT,
style = styles.text
)
txt.draw(g, x1 + d + 4, offset + i * rowHeight, x2, y2)
}
case _ =>
}
}
}
private def format(v: Double, specialPrefix: Boolean = true): String = {
plot.tickLabelMode match {
case TickLabelMode.BINARY =>
if (specialPrefix) UnitPrefix.binary(v).format(v, "%9.2f%1s", "%8.1e ")
else UnitPrefix.decimal(v).format(v, "%9.2f%1s", "%8.1e ")
case TickLabelMode.DURATION =>
if (specialPrefix) UnitPrefix.duration(v).format(v, "%9.2f%1s", "%8.1e ")
else UnitPrefix.decimal(v).format(v, "%9.2f%1s", "%8.1e ")
case _ => UnitPrefix.decimal(v).format(v, "%9.3f%1s", "%8.1e ")
}
}
}
