public override void Update(GameTime gameTime)
{
bool updateCurve = false;
// When the sample is started or when <Space> is pressed, we create a random curve.
if (_curve == null || InputService.IsPressed(Keys.Space, true))
{
_curve = new Curve2F
{
PreLoop = _loopType,
PostLoop = _loopType,
SmoothEnds = _smoothEnds
};
// Create random key points.
for (float x = 0; x <= 1; x += 0.1f)
{
float y = RandomHelper.Random.NextFloat(0, 1);
_curve.Add(new CurveKey2F
{
Point = new Vector2F(x, y),
// We use the same interpolation type (spline type) for all curve keys. But
// it is possible to use a different interpolation type for each curve key.
Interpolation = _interpolationType,
});
}
updateCurve = true;
}
// If <1> is pressed, we change the loop type.
if (InputService.IsPressed(Keys.D1, true))
{
// Choose next enumeration value for _loopType.
if ((int)_loopType + 1 >= EnumHelper.GetValues(typeof(CurveLoopType)).Length)
_loopType = 0;
else
_loopType++;
_curve.PreLoop = _loopType;
_curve.PostLoop = _loopType;
updateCurve = true;
}
// If <2> is pressed, we change the spline type.
if (InputService.IsPressed(Keys.D2, true))
{
// Choose next enumeration value for _interpolationType.
if ((int)_interpolationType + 1 >= EnumHelper.GetValues(typeof(SplineInterpolation)).Length)
_interpolationType = 0;
else
_interpolationType++;
// We skip Bézier and Hermite splines because both need additional information per
// curve key (control points or tangents), which we did not specify in the curve creation.
while (_interpolationType == SplineInterpolation.Bezier
|| _interpolationType == SplineInterpolation.Hermite)
{
_interpolationType++;
}
_curve.ForEach(key => key.Interpolation = _interpolationType);
updateCurve = true;
}
// If <3> is pressed, we toggle "SmoothEnds".
// If SmoothEnds is enabled the curve is smoother at the first and at the last
// key point. The effect of SmoothEnds is visible, for example, if the loop type
// is "Oscillate" and the spline type is "CatmullRom".
if (InputService.IsPressed(Keys.D3, true))
{
_smoothEnds = !_smoothEnds;
_curve.SmoothEnds = _smoothEnds;
updateCurve = true;
}
if (updateCurve)
{
var debugRenderer = GraphicsScreen.DebugRenderer2D;
debugRenderer.Clear();
debugRenderer.DrawText(
string.Format("\n\nLoop type = {0}\nInterpolation = {1}\nSmoothEnds = {2}",
_curve.PreLoop, _curve[0].Interpolation, _curve.SmoothEnds));
// Draw two lines to create chart axes.
debugRenderer.DrawLine(new Vector3F(100, 300, 0), new Vector3F(1000, 300, 0), Color.Black, true);
debugRenderer.DrawLine(new Vector3F(300, 100, 0), new Vector3F(300, 320, 0), Color.Black, true);
Vector2F scale = new Vector2F(400, 200);
Vector2F offset = new Vector2F(300, 100);
// Draw a small cross for all curve key points.
for (int index = 0; index < _curve.Count; index++)
{
CurveKey2F key = _curve[index];
Vector2F point = scale * key.Point + offset;
debugRenderer.DrawLine(new Vector3F(point.X - 5, point.Y - 5, 0), new Vector3F(point.X + 5, point.Y + 5, 0), Color.Black, true);
debugRenderer.DrawLine(new Vector3F(point.X + 5, point.Y - 5, 0), new Vector3F(point.X - 5, point.Y + 5, 0), Color.Black, true);
}
// Draw the curve.
const float stepSize = 0.02f;
for (float x = -0.5f; x < 1.7f; x += stepSize)
{
Vector2F point0 = scale * _curve.GetPoint(x) + offset;
Vector2F point1 = scale * _curve.GetPoint(x + stepSize) + offset;
debugRenderer.DrawLine(new Vector3F(point0.X, point0.Y, 0), new Vector3F(point1.X, point1.Y, 0), Color.Black, true);
}
}
base.Update(gameTime);
}
public override void Update(GameTime gameTime)
{
bool updateCurve = false;
// When the sample is started or when <Space> is pressed, we create a random curve.
if (_curve == null || InputService.IsPressed(Keys.Space, true))
{
_curve = new Curve2F
{
PreLoop = _loopType,
PostLoop = _loopType,
SmoothEnds = _smoothEnds
};
// Create random key points.
for (float x = 0; x <= 1; x += 0.1f)
{
float y = RandomHelper.Random.NextFloat(0, 1);
_curve.Add(new CurveKey2F
{
Point = new Vector2F(x, y),
// We use the same interpolation type (spline type) for all curve keys. But
// it is possible to use a different interpolation type for each curve key.
Interpolation = _interpolationType,
});
}
updateCurve = true;
}
// If <1> is pressed, we change the loop type.
if (InputService.IsPressed(Keys.D1, true))
{
// Choose next enumeration value for _loopType.
if ((int)_loopType + 1 >= EnumHelper.GetValues(typeof(CurveLoopType)).Length)
{
_loopType = 0;
}
else
{
_loopType++;
}
_curve.PreLoop = _loopType;
_curve.PostLoop = _loopType;
updateCurve = true;
}
// If <2> is pressed, we change the spline type.
if (InputService.IsPressed(Keys.D2, true))
{
// Choose next enumeration value for _interpolationType.
if ((int)_interpolationType + 1 >= EnumHelper.GetValues(typeof(SplineInterpolation)).Length)
{
_interpolationType = 0;
}
else
{
_interpolationType++;
}
// We skip Bezier and Hermite splines because both need additional information per
// curve key (control points or tangents), which we did not specify in the curve creation.
while (_interpolationType == SplineInterpolation.Bezier ||
_interpolationType == SplineInterpolation.Hermite)
{
_interpolationType++;
}
_curve.ForEach(key => key.Interpolation = _interpolationType);
updateCurve = true;
}
// If <3> is pressed, we toggle "SmoothEnds".
// If SmoothEnds is enabled the curve is smoother at the first and at the last
// key point. The effect of SmoothEnds is visible, for example, if the loop type
// is "Oscillate" and the spline type is "CatmullRom".
if (InputService.IsPressed(Keys.D3, true))
{
_smoothEnds = !_smoothEnds;
_curve.SmoothEnds = _smoothEnds;
updateCurve = true;
}
if (updateCurve)
{
var debugRenderer = GraphicsScreen.DebugRenderer2D;
debugRenderer.Clear();
debugRenderer.DrawText(
string.Format("\n\nLoop type = {0}\nInterpolation = {1}\nSmoothEnds = {2}",
_curve.PreLoop, _curve[0].Interpolation, _curve.SmoothEnds));
// Draw two lines to create chart axes.
debugRenderer.DrawLine(new Vector3F(100, 300, 0), new Vector3F(1000, 300, 0), Color.Black, true);
debugRenderer.DrawLine(new Vector3F(300, 100, 0), new Vector3F(300, 320, 0), Color.Black, true);
Vector2F scale = new Vector2F(400, 200);
Vector2F offset = new Vector2F(300, 100);
// Draw a small cross for all curve key points.
for (int index = 0; index < _curve.Count; index++)
{
CurveKey2F key = _curve[index];
Vector2F point = scale * key.Point + offset;
debugRenderer.DrawLine(new Vector3F(point.X - 5, point.Y - 5, 0), new Vector3F(point.X + 5, point.Y + 5, 0), Color.Black, true);
debugRenderer.DrawLine(new Vector3F(point.X + 5, point.Y - 5, 0), new Vector3F(point.X - 5, point.Y + 5, 0), Color.Black, true);
}
// Draw the curve.
const float stepSize = 0.02f;
for (float x = -0.5f; x < 1.7f; x += stepSize)
{
Vector2F point0 = scale * _curve.GetPoint(x) + offset;
Vector2F point1 = scale * _curve.GetPoint(x + stepSize) + offset;
debugRenderer.DrawLine(new Vector3F(point0.X, point0.Y, 0), new Vector3F(point1.X, point1.Y, 0), Color.Black, true);
}
}
base.Update(gameTime);
}