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using System;
using System.Windows.Forms;
using System.Drawing;
namespace DrawTools
{
/// <summary>
/// Polygon tool
/// </summary>
public class ToolPolygon : DrawTools.ToolObject
{
public ToolPolygon()
{
Cursor = new Cursor(GetType(), "Pencil.cur");
}
private int lastX;
private int lastY;
private DrawPolygon newPolygon;
private const int minDistance = 15*15;
/// <summary>
/// Left nouse button is pressed
/// </summary>
/// <param name="drawArea"></param>
/// <param name="e"></param>
public override void OnMouseDown(DrawArea drawArea, MouseEventArgs e)
{
// Create new polygon, add it to the list
// and keep reference to it
newPolygon = new DrawPolygon(e.X, e.Y, e.X + 1, e.Y + 1);
AddNewObject(drawArea, newPolygon);
lastX = e.X;
lastY = e.Y;
}
/// <summary>
/// Mouse move - resize new polygon
/// </summary>
/// <param name="drawArea"></param>
/// <param name="e"></param>
public override void OnMouseMove(DrawArea drawArea, MouseEventArgs e)
{
drawArea.Cursor = Cursor;
if ( e.Button != MouseButtons.Left )
return;
if ( newPolygon == null )
return; // precaution
Point point = new Point(e.X, e.Y);
int distance = (e.X - lastX)*(e.X - lastX) + (e.Y - lastY)*(e.Y - lastY);
if ( distance < minDistance )
{
// Distance between last two points is less than minimum -
// move last point
newPolygon.MoveHandleTo(point, newPolygon.HandleCount);
}
else
{
// Add new point
newPolygon.AddPoint(point);
lastX = e.X;
lastY = e.Y;
}
drawArea.Refresh();
}
public override void OnMouseUp(DrawArea drawArea, MouseEventArgs e)
{
newPolygon = null;
base.OnMouseUp (drawArea, e);
}
}
}
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