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Horizontal Gridlines #8

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Horizontal Gridlines #8

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17be900
Horizontal Gridlines
charlietcheng Nov 25, 2021
317c91d
Rounding up
charlietcheng Nov 25, 2021
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1 change: 1 addition & 0 deletions src/main/scala/BTreeChart.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -87,6 +87,7 @@ case class ChartParameters(width: Int, height: Int, xMin: Long, xMax: Long, yMin
def xValToPos(value: Long): Double = (value - xMin) * xScale
def xPosToVal(pos: Double): Long = (pos / xScale).toLong + xMin
def yValToPos(value: Double): Double = (yMax - value) * yScale
def yPosToVal(pos: Double): Double = yMax - (pos / yScale)

// TODO is this the right place for these functions to live?
def timestampFromDateTime(dateTime: ZonedDateTime): Long = {
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17 changes: 16 additions & 1 deletion src/main/scala/GridCanvas.scala
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Expand Up @@ -38,6 +38,21 @@ class GridCanvas extends ResizableCanvas {
gc.restore()
}


protected def drawValueLines(gc: GraphicsContext, scale: ChartParameters): Unit = {
gc.save()
gc.setStroke(gc.getStroke.asInstanceOf[Color].deriveColor(0, 1, 1, GRIDLINE_ALPHA))
gc.setLineWidth(CONTEXT_GRIDLINE_WIDTH)
val v_interval = List.range(0,scale.height,64)
v_interval.foreach{ value =>
gc.strokeLine(0,value,scale.width,value)
// println(s"DEBUG: value: $value")
RenderHelper.drawContrastText(gc, ChartCommon.CONTRAST_BACKGROUND, ((scale.yPosToVal(value) * 100).round / 100.toDouble).toString,
20, value)
}
gc.restore()
}

protected def drawRulers(gc: GraphicsContext, scale: ChartParameters,
priorContextTime: ZonedDateTime,
tickTimes: Seq[ZonedDateTime], contextTimes: Seq[ZonedDateTime]): Unit = {
Expand Down Expand Up @@ -86,6 +101,6 @@ class GridCanvas extends ResizableCanvas {

drawGridlines(gc, scale, tickTimes, contextTimes)
drawRulers(gc, scale, priorContextTime, tickTimes, contextTimes)

drawValueLines(gc,scale)
}
}