public ICanvas Execute(ICanvas canvas)
{
var width = this.End.X - this.Start.X;
var height = this.End.Y - this.Start.Y;
var line1 = new LineCommand(
this.Start,
new System.Drawing.Point(this.Start.X + width, this.Start.Y));
canvas = line1.Execute(canvas);
var line2 = new LineCommand(
this.Start,
new System.Drawing.Point(this.Start.X, this.Start.Y + height));
canvas = line2.Execute(canvas);
var line3 = new LineCommand(
new System.Drawing.Point(this.Start.X, this.Start.Y + height),
this.End);
canvas = line3.Execute(canvas);
var line4 = new LineCommand(
new System.Drawing.Point(this.Start.X + width, this.Start.Y),
this.End);
canvas = line4.Execute(canvas);
return(canvas);
}
public void ShouldDrawVerticalLineRightToLeft()
{
var start = new System.Drawing.Point(6, 2);
var end = new System.Drawing.Point(6, 0);
var cmd = new LineCommand(start, end);
var canvas = new Canvas(20, 5);
var result = cmd.Execute(canvas);
var expected = new char[20, 5];
expected[6, 0] = 'x';
expected[6, 1] = 'x';
expected[6, 2] = 'x';
Assert.Equal(expected, result.Data);
}
public void ShouldDrawHorizontalLineLeftToRight()
{
var start = new System.Drawing.Point(0, 2);
var end = new System.Drawing.Point(6, 2);
var cmd = new LineCommand(start, end);
var canvas = new Canvas(20, 5);
var result = cmd.Execute(canvas);
var expected = new char[20, 5];
expected[0, 2] = 'x';
expected[1, 2] = 'x';
expected[2, 2] = 'x';
expected[3, 2] = 'x';
expected[4, 2] = 'x';
expected[5, 2] = 'x';
expected[6, 2] = 'x';
Assert.Equal(expected, result.Data);
}