public void Constructor_ThrowsArgumentNullException_OnNullFrame()
{
Frame firstFrame = new Frame(region, 0.1);
Frame secondFrame = null;
var frames = new Frame[] { firstFrame, secondFrame };
Action construct = () => new Animation(frames);
construct.ShouldThrow<ArgumentNullException>().ParamName.ShouldBe("frame");
}
public void Constructor_ThrowsArgumentException_OnEmptyFrames()
{
var frames = new Frame[] { };
Action construct = () => new Animation(frames);
construct.ShouldThrow<ArgumentException>().Message.ShouldContain(
"An animation requires at least one frame. Zero found"
);
}
public void Constructor_CorrectlyInitialises_Instance()
{
var region = new TextureRegion(0, 0, 50, 50);
var frame = new Frame(region, 0.1);
frame.ShouldSatisfyAllConditions(
() => frame.TextureRegion.ShouldBe(region),
() => frame.Duration.ShouldBe(0.1)
);
}
public void Update(double delta)
{
totalElapsedTime += delta;
// get the point in the animation at which the current frame ends
double currentAnimationPoint = frames.Take(currentFrameIndex + 1)
.Sum(f => f.Duration);
if (totalElapsedTime >= currentAnimationPoint && currentFrameIndex < frames.Length - 1)
{
currentFrameIndex++;
currentFrame = frames[currentFrameIndex];
}
if (totalElapsedTime >= totalDuration && loop)
{
Reset();
}
}
public Animation(bool loop, params Frame[] frames)
{
frames.ThrowIfNull(nameof(frames));
if (frames.Length <= 0)
{
throw new ArgumentException(
"An animation requires at least one frame. Zero found"
);
}
foreach (var frame in frames)
{
frame.ThrowIfNull(nameof(frame));
}
this.frames = frames;
this.currentFrame = frames[0];
this.totalDuration = frames.Sum(f => f.Duration);
this.loop = loop;
}
public void Reset()
{
totalElapsedTime = 0;
currentFrameIndex = 0;
currentFrame = frames[currentFrameIndex];
}