Chart.js/test/specs/element.arc.tests.js

// Test the rectangle element

describe('Arc element tests', function() {
  it ('should determine if in range', function() {
    // Mock out the arc as if the controller put it there
    var arc = new Chart.elements.ArcElement({
      startAngle: 0,
      endAngle: Math.PI / 2,
      x: 0,
      y: 0,
      innerRadius: 5,
      outerRadius: 10,
    });

    expect(arc.inRange(2, 2)).toBe(false);
    expect(arc.inRange(7, 0)).toBe(true);
    expect(arc.inRange(0, 11)).toBe(false);
    expect(arc.inRange(Math.sqrt(32), Math.sqrt(32))).toBe(true);
    expect(arc.inRange(-1.0 * Math.sqrt(7), Math.sqrt(7))).toBe(false);
  });

  it ('should determine if in range, when full circle', function() {
    // Mock out the arc as if the controller put it there
    var arc = new Chart.elements.ArcElement({
      startAngle: -Math.PI,
      endAngle: Math.PI * 1.5,
      x: 0,
      y: 0,
      innerRadius: 0,
      outerRadius: 10,
      circumference: Math.PI * 2
    });

    expect(arc.inRange(7, 7)).toBe(true);
  });

  it ('should get the tooltip position', function() {
    // Mock out the arc as if the controller put it there
    var arc = new Chart.elements.ArcElement({
      startAngle: 0,
      endAngle: Math.PI / 2,
      x: 0,
      y: 0,
      innerRadius: 0,
      outerRadius: Math.sqrt(2),
    });

    var pos = arc.tooltipPosition();
    expect(pos.x).toBeCloseTo(0.5);
    expect(pos.y).toBeCloseTo(0.5);
  });

  it ('should get the center', function() {
    // Mock out the arc as if the controller put it there
    var arc = new Chart.elements.ArcElement({
      startAngle: 0,
      endAngle: Math.PI / 2,
      x: 0,
      y: 0,
      innerRadius: 0,
      outerRadius: Math.sqrt(2),
    });

    var center = arc.getCenterPoint();
    expect(center.x).toBeCloseTo(0.5, 6);
    expect(center.y).toBeCloseTo(0.5, 6);
  });

  it ('should get the center of full circle before and after draw', function() {
    // Mock out the arc as if the controller put it there
    var arc = new Chart.elements.ArcElement({
      startAngle: 0,
      endAngle: Math.PI * 2,
      x: 2,
      y: 2,
      innerRadius: 0,
      outerRadius: 2,
      options: {}
    });

    var center = arc.getCenterPoint();
    expect(center.x).toBeCloseTo(1, 6);
    expect(center.y).toBeCloseTo(2, 6);

    var ctx = window.createMockContext();
    arc.draw(ctx);

    center = arc.getCenterPoint();
    expect(center.x).toBeCloseTo(1, 6);
    expect(center.y).toBeCloseTo(2, 6);
  });

  it('should not draw when radius < 0', function() {
    var ctx = window.createMockContext();

    var arc = new Chart.elements.ArcElement({
      startAngle: 0,
      endAngle: Math.PI / 2,
      x: 0,
      y: 0,
      innerRadius: -0.1,
      outerRadius: Math.sqrt(2),
      options: {}
    });

    arc.draw(ctx);

    expect(ctx.getCalls().length).toBe(0);

    arc = new Chart.elements.ArcElement({
      startAngle: 0,
      endAngle: Math.PI / 2,
      x: 0,
      y: 0,
      innerRadius: 0,
      outerRadius: -1,
      options: {}
    });

    arc.draw(ctx);

    expect(ctx.getCalls().length).toBe(0);
  });
});