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Plot coordinate pairs: Difference between revisions
→{{header|Scala}}: Maintained
m (→{{header|Java}}: Correct Lang tag) |
(→{{header|Scala}}: Maintained) |
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=={{header|Scala}}==
<lang Scala>import scala.swing.
import scala.swing.
import
object PlotCoordPairs extends scala.swing.SimpleSwingApplication {
//min/max of display-x resp. y
val (dx0, dy0) = (70, 30)
val
val
lazy val ui = new Panel {
background = Color.white▼
preferredSize = (prefSizeX, prefSizeY)▼
import math._
val xmax = {
val f1 = pow(10, log10(xs.max).toInt)
val f2 = if (f1 < 10) 10 else round(xs.max / f1) * f1
if (f2 >= xs.max) f2 else (round(xs.max / f1) + 1) * f1
}
val ymax = {
val f1 = pow(10, log10(ys.max).toInt)
val f2 = if (f1 < 10) 10 else round(ys.max / f1) * f1
if (f2 >= ys.max) f2 else (round(ys.max / f1) + 1) * f1
}
val xinterv = xmax/xs.size▼
val (xinterv, yinterv) = (xmax / xs.size, ymax / xs.size)
case class Coord(x: Double, y: Double) {
val (dx, dy) = ((x / xmax * (dxm - dx0) + dx0).toInt, (dym - y / ymax * (dym - dy0)).toInt)
}
val pcentre = Coord(0, 0)
val pxmax = Coord(xmax, 0)
val pymax = Coord(0, ymax)
▲ background = Color.white
▲ preferredSize = (prefSizeX, prefSizeY)
//axes:
a_path.moveTo(
a_path.lineTo(
a_path.moveTo(pcentre.dx, pcentre.dy)▼
a_path.lineTo(pymax.dx, pymax.dy) //y-axis
// interval
a_path.lineTo(p.dx, p.dy + 5)
▲ })
xs.map(i => Coord(0, i * yinterv)).map(p => {
a_path.lineTo(p.dx - 5, p.dy)
▲ })
//grid:
(1 to xs.size).
(1 to xs.size).map(i=>Coord(i*xinterv, 0)).map(p=>{g_path.moveTo(p.dx,p.dy);g_path.lineTo(Coord(p.x,ymax).dx,Coord(p.x,ymax).dy)})▼
g_path.moveTo(p.dx, p.dy);
▲
})▼
g_path.moveTo(p.dx, p.dy);
g_path.lineTo(Coord(xmax, p.y).dx, Coord(xmax, p.y).dy)
▲ })
//labeling:
val xlabels = (0 to xs.size).map(i => {
val p = Coord(i * xinterv, 0)
▲ val ylabels = (0 to xs.size).map(i=>{val p=Coord(0,i*yinterv); Triple(p.y.toInt.toString,p.dx-30,p.dy+5)})
Triple(p.x.toInt.toString, p.dx - 3, p.dy + 20)
})▼
val p = Coord(0, i * yinterv)
Triple(p.y.toInt.toString, p.dx - 30, p.dy + 5)
})
//curve:
val curve =
path.moveTo(curve
curve.map(p => path.lineTo(p.dx, p.dy))
//...flag all function values:
val rects = curve.map(p => new Rectangle(p.dx - 3, p.dy - 3, 6, 6))
override def paintComponent(g: Graphics2D) = {
super.paintComponent(g)
Line 1,464 ⟶ 1,477:
g.setColor(Color.black)
g.draw(a_path)
xlabels.map(t => g.drawString(t._1, t._2, t._3))
ylabels.map(t => g.drawString(t._1, t._2, t._3))
g.draw(path)
rects.map(g.draw(_))
}
}
val xs =
val ys: List[Double] = List(2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.3, 180.0)
def top = new MainFrame {
Line 1,478 ⟶ 1,491:
contents = ui
}
}</lang>
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