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// Mines is free software: you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
// Mines is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along with
// Mines. If not, see <https://www.gnu.org/licenses/>.
package space.jakob.mines
import android.content.Context
import android.graphics.Bitmap
import android.graphics.BitmapFactory
import android.graphics.Canvas
import android.graphics.Rect
import android.graphics.Paint
import android.util.AttributeSet
import android.view.View
import android.util.Log
import kotlin.math.ceil
import kotlin.math.floor
enum class AtlasEntry {
BLANK, MASKED, UNMASKED,
ONE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT,
FLAG, UNKNOWN, MINE, TRIPPED,
}
class GameView(context: Context, attrs: AttributeSet) : View(context, attrs) {
val atlas = BitmapFactory.decodeResource(context.resources, R.drawable.atlas);
val tileWidth = atlas.width / 3
val scaledTileWidth: Int
get() = (minOf(width, height) / cameraBreadth).toInt()
var grid: Grid? = null
// All of the state for maintaining the view's current positioning. For an
// explanation of these values, see `drawGrid`.
var cameraX = 0.0
var cameraY = 0.0
var cameraBreadth = 5.0
// Properties for scaling cameraBreadth to the screen resolution.
val cameraBreadthX: Double
get() = if (width > height) {
cameraBreadth * width.toDouble() / height.toDouble()
} else {
cameraBreadth
}
val cameraBreadthY: Double
get() = if (height > width) {
cameraBreadth * height.toDouble() / width.toDouble()
} else {
cameraBreadth
}
/**
* Returns the grid coordinates for the tile at the given screen coordinates.
*/
fun toGridCoordinates(x: Int, y: Int) = Pair(
// These were derived algebraically from the formula in `drawGrid`.
((x.toDouble() / scaledTileWidth.toDouble()) - cameraBreadthX / 2 + cameraX).toInt(),
((y.toDouble() / scaledTileWidth.toDouble()) - cameraBreadthY / 2 + cameraY).toInt()
)
/**
* Moves the camera by (@param dx, @param dy), clamping to grid bounds.
*/
fun moveCamera(dx: Double, dy: Double) {
grid?.let {
cameraX = (cameraX + dx / 100.0).coerceIn(0.0, (it.width).toDouble())
cameraY = (cameraY + dy / 100.0).coerceIn(0.0, (it.height).toDouble())
}
}
fun scaleCamera(factor: Double) {
val maxBreadth = grid?.width?.toDouble() ?: 0.0
cameraBreadth = (cameraBreadth / factor).coerceIn(5.0, maxBreadth)
}
/**
* Reveal and @return the tile at (@param x, @param y).
*/
fun revealAt(x: Int, y: Int): Tile? = grid?.let {
val (x, y) = toGridCoordinates(x.toInt(), y.toInt())
if (it.valid(x, y)) {
it.reveal(x, y)
return it[x, y]
} else {
return null
}
}
private fun atlasRect(entry: AtlasEntry): Rect {
val atlasWidth = 3
val x = (entry.ordinal % atlasWidth) * tileWidth
val y = (entry.ordinal / atlasWidth) * tileWidth
return Rect(x, y, x + tileWidth, y + tileWidth)
}
private fun drawTile(canvas: Canvas, tile: Tile, x: Int, y: Int) {
val tileSpacing = 2.0 / 27.0
val xSpacing = (scaledTileWidth * tileSpacing).toInt()
val ySpacing = (scaledTileWidth * tileSpacing).toInt()
// TODO: Opportunity for more ASCII art explanations :)
val dst = Rect(
x + xSpacing,
y + ySpacing,
x + scaledTileWidth - xSpacing,
y + scaledTileWidth - ySpacing
)
if (tile.masked) {
canvas.drawBitmap(atlas, atlasRect(AtlasEntry.MASKED), dst, null)
} else {
canvas.drawBitmap(atlas, atlasRect(AtlasEntry.UNMASKED), dst, null)
val overlay = when {
tile.mine -> AtlasEntry.MINE
tile.adjacentMines == 1 -> AtlasEntry.ONE
tile.adjacentMines == 2 -> AtlasEntry.TWO
tile.adjacentMines == 3 -> AtlasEntry.THREE
tile.adjacentMines == 4 -> AtlasEntry.FOUR
tile.adjacentMines == 5 -> AtlasEntry.FIVE
tile.adjacentMines == 6 -> AtlasEntry.SIX
tile.adjacentMines == 7 -> AtlasEntry.SEVEN
tile.adjacentMines == 8 -> AtlasEntry.EIGHT
else -> AtlasEntry.BLANK
}
canvas.drawBitmap(atlas, atlasRect(overlay), dst, null)
}
}
private fun drawGrid(canvas: Canvas, grid: Grid) {
// The state maintained for drawing the view is a position, (`cameraX`,
// `cameraY`), representing the centroid of a rectangle whose sides are
// of length `cameraBreadthX` and `cameraBreadthY`. Only the tiles
// intersecting this rectangle are drawn.
//
// +============+
// / | |
// | | |
// | | |
// cameraBreadthY < | x |
// | | \__________ (cameraX, cameraY)
// | | |
// \ | |
// +============+
// \_____ ______/
// v
// cameraBreadthX
for (x in 0 until grid.width) {
for (y in 0 until grid.height) {
drawTile(
canvas,
grid[x, y],
((x + cameraBreadthX / 2 - cameraX) * scaledTileWidth).toInt(),
((y + cameraBreadthY / 2 - cameraY) * scaledTileWidth).toInt()
)
}
}
}
override fun onDraw(canvas: Canvas) {
super.onDraw(canvas)
grid?.let {
drawGrid(canvas, it)
}
}
}
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