[]drawTexture的matrix参数是怎么用的

const matrices = Array(4).fill('').map(_ => new Laya.Matrix())

matrices.forEach((matrix, i) => matrix.rotate(Math.PI / 2 * i))



tileIndices.forEach((idxOnSource, idxOnTilemap) => {

  if (!idxOnSource) return

  const position = tilemap.getTilePositionByIndex(idxOnTilemap)

  const tileTexture = getTexture(idxOnSource)

  const matrix = matrices[(tileRotates && tileRotates[idxOnTilemap]) || 0]



  this.graphics.drawTexture(tileTexture, position.x, position.y, tileSize, tileSize, matrix)

})

这段是应用代码

        var matrix:Laya.Matrix =  new Laya.Matrix();
        // x
        // matrix.scale(-1,1)
        // matrix.tx = t.sourceWidth
        // y
        // matrix.scale(1, -1)
        // matrix.ty = t.sourceHeight
        // x + y
        matrix.scale(-1, -1)
        matrix.tx = t.sourceWidth
        matrix.ty = t.sourceHeight
        p.graphics.drawTexture(t, 0,0,null,null,matrix);