commonMain.org.jetbrains.skia.Matrix44.kt Maven / Gradle / Ivy
package org.jetbrains.skia
import org.jetbrains.skia.impl.InteropPointer
import org.jetbrains.skia.impl.InteropScope
import org.jetbrains.skia.impl.withResult
/**
*
* 4x4 matrix used by SkCanvas and other parts of Skia.
*
* Skia assumes a right-handed coordinate system:
* +X goes to the right
* +Y goes down
* +Z goes into the screen (away from the viewer)
*/
class Matrix44(vararg mat: Float) {
/**
* Matrix elements are in row-major order.
*/
val mat: FloatArray
/**
*
* When converting from Matrix44 to Matrix33, the third row and
* column is dropped.
*
* `
* [ a b _ c ] [ a b c ]
* [ d e _ f ] -> [ d e f ]
* [ _ _ _ _ ] [ g h i ]
* [ g h _ i ]
` *
*/
fun asMatrix33(): Matrix33 {
return Matrix33(mat[0], mat[1], mat[3], mat[4], mat[5], mat[7], mat[12], mat[13], mat[15])
}
override fun equals(other: Any?): Boolean {
if (other === this) return true
if (other !is Matrix44) return false
return mat.contentEquals(other.mat)
}
override fun hashCode(): Int {
val PRIME = 59
var result = 1
result = result * PRIME + mat.contentHashCode()
return result
}
override fun toString(): String {
return "Matrix44(_mat=$mat)"
}
companion object {
val IDENTITY = Matrix44(1f, 0f, 0f, 0f, 0f, 1f, 0f, 0f, 0f, 0f, 1f, 0f, 0f, 0f, 0f, 1f)
internal fun fromInteropPointer(block: InteropScope.(InteropPointer) -> Unit): Matrix44 {
val result = withResult(FloatArray(16), block)
return Matrix44(*result)
}
}
/**
* The constructor parameters are in row-major order.
*/
init {
require(mat.size == 16) { "Expected 16 elements, got ${mat.size}" }
this.mat = mat
}
}