Started calculator

src/MusicalScore/Calculation/VexFlowMeasureSizeCalculator.ts

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+interface VexFlowVoice {
+
+}
+
+interface VexFlowStave {
+  x: number;
+  start_x: number;
+  end_x: number;
+
+  getWidth(): number;
+  setWidth(width: number): VexFlowStave;
+  format(): void;
+  getSpacingBetweenLines(): number;
+}
+
+class MeasureSizeCalculator {
+  public stave: VexFlowStave;
+  public voices: VexFlowVoice;
+  public formatter: any;
+
+  private offsetLeft: number;
+  private offsetRight: number;
+  private voicesWidth: number;
+  private topBorder: number;
+  private bottomBorder: number;
+
+  constructor(stave: VexFlowStave, voices: VexFlowVoice[], formatter: any) {
+    this.stave = stave;
+    this.voices = voices;
+    this.formatter = formatter;
+    // the stave must be initialized with width, x, y 0
+    // the voices must be already joined and (pre)formatted
+    if (!formatter.hasMinTotalWidth) {
+      throw "Must first call Formatter.preCalculateMinTotalWidth " +
+      "with all the voices in the measure (vertical)";
+    }
+    this.format();
+  }
+
+  public getWidth(): number {
+    // begin_modifiers + voices + end_modifiers
+    return this.offsetLeft + this.voicesWidth + this.offsetRight;
+    // = stave.end_x - stave.x
+  }
+
+  public getHeight(): number {
+    return this.stave.getSpacingBetweenLines()
+      * (this.topBorder - this.bottomBorder);
+  }
+
+  // The following methods return a number
+  // where 0 is the upper line of the stave.
+
+  public getTopBorder(): number {
+    return this.topBorder;
+  }
+
+  public getBottomBorder(): number {
+    return this.bottomBorder;
+  }
+
+  private format(): void {
+    let stave: VexFlowStave = this.stave;
+    // Compute widths
+    this.voicesWidth = this.formatter.minTotalWidth;
+    stave.setWidth(this.voicesWidth);
+    stave.format();
+    this.offsetLeft = stave.start_x - stave.x;
+    this.offsetRight = stave.end_x - stave.getWidth() - stave.start_x;
+    // Compute heights
+    // Height is:
+    //// height of StaveModifiers + BoundingBox of notes + height of NoteMod's
+    // TODO
+  }
+}