protected override void LoadContent()
{
_spriteBatch = new SpriteBatch(GraphicsDevice);
_font = Content.Load <SpriteFont>("MgGenFont");
_dot = CreateDotTexture(GraphicsDevice, Color.White);
curve = new Curve_BezierSplineWeighted(_wayPoints, 0.5f, isCurveClosed);
DrawHelpers.Initialize(GraphicsDevice, _spriteBatch, null);
}
protected override void Update(GameTime gameTime)
{
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
{
Exit();
}
ms = Mouse.GetState();
bool redoCurve = false;
CurveIterationTimer(gameTime);
// next control point
if (IsPressedWithDelay(Keys.Space, gameTime))
{
selectedCp += 1;
if (selectedCp > _wayPoints.Length - 1)
{
selectedCp = 0;
}
}
// switch curve open or closed.
if (IsPressedWithDelay(Keys.Tab, gameTime))
{
isCurveClosed = !isCurveClosed;
redoCurve = true;
}
// adjust weight
if (IsPressedWithDelay(Keys.Up, gameTime) || ms.ScrollWheelValue > currentScrollWheelvalue)
{
selectedWeight += .05f;
if (selectedWeight > maxSelectableWeight)
{
selectedWeight = -1f;
}
_wayPoints[selectedCp].W = selectedWeight;
currentScrollWheelvalue = ms.ScrollWheelValue;
redoCurve = true;
}
// adjust weight
if (IsPressedWithDelay(Keys.Down, gameTime) || ms.ScrollWheelValue < currentScrollWheelvalue)
{
selectedWeight -= .05f;
if (selectedWeight < -1f)
{
selectedWeight = maxSelectableWeight;
}
_wayPoints[selectedCp].W = selectedWeight;
currentScrollWheelvalue = ms.ScrollWheelValue;
redoCurve = true;
}
// adjust control point position.
if (ms.LeftButton == ButtonState.Pressed)
{
_wayPoints[selectedCp] = new Vector4(ms.Position.X, ms.Position.Y, 0, _wayPoints[selectedCp].W);
redoCurve = true;
}
// select a control point.
if (ms.RightButton == ButtonState.Pressed)
{
CheckPointSelected();
}
if (redoCurve)
{
curve = new Curve_BezierSplineWeighted(_wayPoints, isCurveClosed);
}
string msg2 = "Open";
if (isCurveClosed)
{
msg2 = "Closed";
}
msg =
$"Bezier " +
$"\n" + $"Press Tab ....... Curve is {msg2}" +
$"\n" + $"Left Click ........ Move selectedCp " +
$"\n" + $"Right Click ...... Selected Cp " + selectedCp +
$"\n" + $"Mouse Scroll ... Alter Weight " + selectedWeight
;
base.Update(gameTime);
}
