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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using OSGeo.MapServer;

namespace DMS.MapLibrary

{

/// <summary>

/// Represents a Form for changing the map view.

/// </summary>

public partial class ChangeViewForm : Form, IMapControl

{

private MapObjectHolder target;

private mapObj map;

private bool dirtyFlag;

private double zoomFactor = 1.0;

int unitPrecision;

MS_UNITS mapunits;

/// <summary>

/// Constructs a new ChangeViewForm class.

/// </summary>

public ChangeViewForm()

{

InitializeComponent();

}

/// <summary>

/// Sets the modify flag of the editor.

/// </summary>

/// <param name="dirty">The modify flag to be set.</param>

private void SetDirty(bool dirty)

{

dirtyFlag = dirty;

if (dirty)

{

if (target != null)

target.RaisePropertyChanging(this);

}

}

#region IMapControl Members

/// <summary>

/// Refresh the controls according to the underlying object.

/// </summary>

public void RefreshView()

{

mapunits = map.units;

unitPrecision = MapUtils.GetUnitPrecision(mapunits);

textBoxX.Text = Convert.ToString(Math.Round((map.extent.maxx + map.extent.minx) / 2, unitPrecision));

textBoxY.Text = Convert.ToString(Math.Round((map.extent.maxy + map.extent.miny) / 2, unitPrecision));

labelUnit2.Text = MapUtils.GetUnitName(mapunits);

textBoxScale.Text = Convert.ToString(Convert.ToInt32(map.scaledenom));

labelUnit1.Text = MapUtils.GetUnitName(mapunits);

double zoom = (map.extent.maxx - map.extent.minx);

if (mapunits != map.units)

zoom = zoom * MapUtils.InchesPerUnit(map.units) / MapUtils.InchesPerUnit(mapunits);

textBoxZoomWidth.Text = Convert.ToString(Math.Round(zoom, unitPrecision));

}

/// <summary>

/// Gets and sets the target object of the editor.

/// </summary>

public MapObjectHolder Target

{

get

{

return target;

}

set

{

if (value != null)

{

if (value.GetType() != typeof(mapObj))

throw new ApplicationException("Invalid object type.");

map = value;

target = value;

RefreshView();

return;

}

map = null;

target = null;

}

}

/// <summary>

/// The EditProperties event handler. Called when a child object should be edited

/// </summary>

public event EditPropertiesEventHandler EditProperties;

#endregion

/// <summary>

/// Click event handler of the buttonOK control.

/// </summary>

/// <param name="sender">The source object of this event.</param>

/// <param name="e">The event parameters.</param>

private void buttonOK_Click(object sender, EventArgs e)

{

buttonApply_Click(sender, e);

this.Close();

}

/// <summary>

/// Click event handler of the buttonCancel control.

/// </summary>

/// <param name="sender">The source object of this event.</param>

/// <param name="e">The event parameters.</param>

private void buttonCancel_Click(object sender, EventArgs e)

{

this.Close();

}

/// <summary>

/// Validating event handler of the textBoxZoomWidth control.

/// </summary>

/// <param name="sender">The source object of this event.</param>

/// <param name="e">The event parameters.</param>

private void textBoxZoomWidth_Validating(object sender, CancelEventArgs e)

{

double result;

if (!double.TryParse(((TextBoxBase)sender).Text, out result) || result <= 0)

{

MessageBox.Show("Invalid zoom width or wrong number", "MapManager", MessageBoxButtons.OK, MessageBoxIcon.Error);

e.Cancel = true;

return;

}

if (mapunits != map.units)

result = result * MapUtils.InchesPerUnit(mapunits) / MapUtils.InchesPerUnit(map.units);

zoomFactor = result / (map.extent.maxx - map.extent.minx);

textBoxScale.Text = Convert.ToString(Convert.ToInt32(map.scaledenom * zoomFactor));

}

/// <summary>

/// Validating event handler of the textBoxScale control.

/// </summary>

/// <param name="sender">The source object of this event.</param>

/// <param name="e">The event parameters.</param>

private void textBoxScale_Validating(object sender, CancelEventArgs e)

{

double result;

if (!double.TryParse(((TextBoxBase)sender).Text, out result) || result <= 0)

{

MessageBox.Show("Invalid scale or wrong number", "MapManager", MessageBoxButtons.OK, MessageBoxIcon.Error);

e.Cancel = true;

return;

}

zoomFactor = result / map.scaledenom;

double zoom = (map.extent.maxx - map.extent.minx);

if (mapunits != map.units)

zoom = zoom * MapUtils.InchesPerUnit(map.units) / MapUtils.InchesPerUnit(mapunits);

textBoxZoomWidth.Text = Convert.ToString(Math.Round((zoom) * zoomFactor, unitPrecision));

}

/// <summary>

/// Common function to validate the double values in the textBox controls. Called by the textBox event handlers.

/// </summary>

/// <param name="sender">The source object of this event.</param>

/// <param name="e">The event parameters.</param>

private void ValidateDouble(object sender, CancelEventArgs e)

{

double result;

if (!double.TryParse(((TextBoxBase)sender).Text, out result))

{

MessageBox.Show("Invalid number", "MapManager", MessageBoxButtons.OK, MessageBoxIcon.Error);

e.Cancel = true;

}

}

/// <summary>

/// Click event handler of the buttonApply control.

/// </summary>

/// <param name="sender">The source object of this event.</param>

/// <param name="e">The event parameters.</param>

private void buttonApply_Click(object sender, EventArgs e)

{

double deltaX = (map.extent.maxx - map.extent.minx) * zoomFactor / 2;

double deltaY = (map.extent.maxy - map.extent.miny) * zoomFactor / 2;

double centerX = double.Parse(textBoxX.Text);

double centerY = double.Parse(textBoxY.Text);

map.setExtent(centerX - deltaX, centerY - deltaY, centerX + deltaX, centerY + deltaY);

target.RaisePropertyChanged(this);

double zoom = (map.extent.maxx - map.extent.minx);

if (mapunits != map.units)

zoom = zoom * MapUtils.InchesPerUnit(map.units) / MapUtils.InchesPerUnit(mapunits);

target.RaiseZoomChanged(this, Math.Round(zoom, unitPrecision), map.scaledenom);

zoomFactor = 1.0;

}

private void ChangeViewForm_KeyDown(object sender, KeyEventArgs e)

{

if (e.KeyCode == Keys.Escape)

{

this.Close();

}

}

}

}