public bool ReadRecord(out DrawLineCommand record)
{
record = default;
unsafe
{
fixed(byte *pByte = this.buffer)
{
// This pointer points to the current read point in the
// instruction stream.
byte *pCur = pByte;
// This points to the first byte past the end of the
// instruction stream (i.e. when to stop)
byte *pEndOfInstructions = pByte + this.currentReadOffset;
if ((pCur >= pEndOfInstructions)) //reach end
{
return(false);
}
RecordHeader *pCurRecord = (RecordHeader *)pCur;
if (pCurRecord->Type != RecordType.DrawLine)
{
return(false);
}
DrawLineCommand *data = (DrawLineCommand *)(pCur + sizeof(RecordHeader));
record = *data;
this.currentReadOffset += pCurRecord->Size;
return(true);
}
}
}
public void Throw_When_No_Canvas_Exist()
{
var command = new DrawLineCommand();
command.Input = new string[] { "1", "1", "1", "5" };
Action test = () => command.Execute(null);
test.Should().Throw <ArgumentNullException>();
}
public void Throw_When_An_Expected_Param_Is_Of_Invalid_Format(string arg1, string arg2, string arg3, string arg4)
{
var canvas = new Canvas(new CanvasDimentions {
Width = 100, Height = 100
});
var command = new DrawLineCommand();
command.Input = new string[] { arg1, arg2, arg3, arg4 };
Action test = () => command.Execute(canvas);
test.Should().Throw <ArgumentException>();
}
public void Throw_When_Null_Argument()
{
var canvas = new Canvas(new CanvasDimentions {
Width = 100, Height = 100
});
var command = new DrawLineCommand();
command.Input = null;
Action test = () => command.Execute(canvas);
test.Should().Throw <ArgumentNullException>();
}
public void Call_Canvas_DrawLine_When_Params_Are_Fine()
{
var args = new string[] { "1", "1", "1", "20" };
var expectedLine = new Line(new Point(1 - 1, 1 - 1), new Point(1 - 1, 20 - 1)); //adjust 1-based coordinates to 0-based
var mockCanvas = new Mock <ICanvas>();
var command = new DrawLineCommand();
command.Input = args;
command.Execute(mockCanvas.Object);
mockCanvas.Verify(x => x.DrawLine(expectedLine), Times.Exactly(1), "DrawLineCommand doesn't call Canvas.DrawLine with correct args");
}
public void Throw_When_Fewer_Params_Than_Expected_Are_Passed()
{
var canvas = new Canvas(new CanvasDimentions {
Width = 100, Height = 100
});
var command = new DrawLineCommand();
command.Input = new string[] { "1", "2", "3" };
Action test = () => command.Execute(canvas);
test.Should().Throw <ArgumentException>();
}
public override void DrawLine(Pen pen, Point point0, Point point1)
{
if (pen == null)
{
throw new ArgumentNullException(nameof(pen));
}
unsafe
{
EnsureContent();
var penIndex = content.AddDependentResource(pen);
var record = new DrawLineCommand(penIndex, point0, point1);
content.WriteRecord(RecordType.DrawLine, (byte *)&record, sizeof(DrawLineCommand));
}
}