Bitmap/Bresenham's line algorithm: Difference between revisions
Added Kotlin
m (→version 1: added comments to the REXX section header concerning the REXX program's capabilities/features.) |
(Added Kotlin) |
||
Line 1,919:
2 3
3 4</lang>
=={{header|Kotlin}}==
{{trans|Java}}
<lang scala>// version 1.1.1
import java.awt.*
import javax.swing.*
class Bresenham(w: Int, h: Int) : JPanel() {
private val centerX = w / 2
private val centerY = h / 2
init {
preferredSize = Dimension(w, h)
background = Color.blue
}
override protected fun paintComponent(g: Graphics) {
super.paintComponent(g)
drawLine(g, 0, 0, 8, 19) // NNE
drawLine(g, 0, 0, 19, 8) // ENE
drawLine(g, 0, 0, 19, -8) // ESE
drawLine(g, 0, 0, 8, -19) // SSE
drawLine(g, 0, 0, -8, -19) // SSW
drawLine(g, 0, 0, -19, -8) // WSW
drawLine(g, 0, 0, -19, 8) // WNW
drawLine(g, 0, 0, -8, 19) // NNW
}
private fun plot(g: Graphics, x: Int, y: Int) {
g.color = Color.white
g.drawOval(centerX + x * 10, centerY -y * 10, 10, 10)
}
private fun drawLine(g: Graphics, x1: Int, y1: Int, x2: Int, y2: Int) {
var d = 0
val dy = Math.abs(y2 - y1)
val dx = Math.abs(x2 - x1)
val dy2 = dy shl 1
val dx2 = dx shl 1
val ix = if (x1 < x2) 1 else -1
val iy = if (y1 < y2) 1 else -1
var xx = x1
var yy = y1
if (dy <= dx) {
while (true) {
plot(g, xx, yy)
if (xx == x2) break
xx += ix
d += dy2
if (d > dx) {
yy += iy
d -= dx2
}
}
}
else {
while (true) {
plot(g, xx, yy)
if (yy == y2) break
yy += iy
d += dx2
if (d > dy) {
xx += ix
d -= dy2
}
}
}
}
}
fun main(args: Array<String>) {
SwingUtilities.invokeLater {
val f = JFrame()
f.defaultCloseOperation = JFrame.EXIT_ON_CLOSE
f.isVisible = true
f.add(Bresenham(600, 500), BorderLayout.CENTER)
f.title = "Bresenham"
f.isResizable = false
f.pack()
f.setLocationRelativeTo(null)
}
}</lang>
=={{header|Maple}}==
| |||