public void AddingSecondSpanAfterExistingShouldNotSetRootToTheSecond()
{
var scanline = new Scanline(640);
var firstRenderedSpans = scanline.Add(0, 50, 0, 0);
var secondRenderedSpans = scanline.Add(100, 150, 0, 0);
Assert.That(scanline.Root, Is.Not.EqualTo(secondRenderedSpans[0]));
Assert.That(scanline.Root, Is.EqualTo(firstRenderedSpans[0]));
}
public void AddingSecondSpanThatShouldBeBeforeExistingShouldSetItToRootAndUpdateLinkInformation()
{
var scanline = new Scanline(640);
var firstRenderedSpans = scanline.Add(100, 150, 0, 0);
var secondRenderedSpans = scanline.Add(0, 50, 0, 0);
Assert.That(scanline.Root,Is.EqualTo(secondRenderedSpans[0]));
Assert.That(secondRenderedSpans[0].Next, Is.Not.Null);
Assert.That(secondRenderedSpans[0].Next, Is.EqualTo(firstRenderedSpans[0]));
Assert.That(secondRenderedSpans[0].Previous,Is.Null);
Assert.That(firstRenderedSpans[0].Previous,Is.EqualTo(secondRenderedSpans[0]));
}
public void AddingFirstSpanShouldSetRootToThatSpanDefinition()
{
var scanline = new Scanline(640);
var xstart = 0;
var xend = 10;
var renderedSpans = scanline.Add(xstart, xend,0,0);
Assert.That(renderedSpans[0],Is.EqualTo(scanline.Root));
Assert.That(renderedSpans[0].XStart, Is.EqualTo(xstart));
Assert.That(renderedSpans[0].XEnd, Is.EqualTo(xend));
}
public void AddingSpanThatClipsWithStartOfScanlineShouldReturnARenderedSpanThatIsClipped()
{
var scanline = new Scanline(640);
var xstart = -10;
var xend = 10;
var renderedSpans = scanline.Add(xstart, xend,0,0);
Assert.That(renderedSpans.Length, Is.EqualTo(1));
Assert.That(renderedSpans[0].XStart,Is.EqualTo(0));
Assert.That(renderedSpans[0].XClip,Is.EqualTo(10));
Assert.That(renderedSpans[0].XEnd, Is.EqualTo(10));
Assert.That(renderedSpans[0].Length, Is.EqualTo(10));
}