matrix.ts
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matrix.ts
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			export class Matrix {
			private readonly offset: number = -140;
			private readonly A: number = 0
			private readonly B: number = 1
			private readonly C: number = 2
			private readonly D: number = 3
			private readonly E: number = 4
			private readonly F: number = 5
			matrix: number[] = [ 1, 0, 0, 1, 0, 0 ]

			constructor(matrix_string: string, zoomFactor?: number){
			if (matrix_string.startsWith('matrix')){
			this.matrix = matrix_string.replace('matrix(','').replace(')','').split(' ').map(n =>Number(n))
			} else if (matrix_string.startsWith('rotation')){
			let angle = Number(matrix_string.replace('rotation(','').replace(')',''))
			let radians = Math.PI/180*angle
			this.matrix[this.A] = Math.round(Math.cos(radians))
			this.matrix[this.B] = Math.sin(radians)
			this.matrix[this.C] = Math.sin(radians)*-1
			this.matrix[this.D] = Math.round(Math.cos(radians))
			}
			if (zoomFactor != null){
			this.matrix[this.E] = zoomFactor*this.offset
			this.matrix[this.F] = zoomFactor*this.offset
			}
			}

			public toString(): string {
			return 'matrix(' + this.matrix.map(n =>String(n)).join(' ') + ')'
			}
			}