You've already forked lazarus-ccr
lazmapviewer: Add geo distance calculation (patch by sstvmaster, https://forum.lazarus.freepascal.org/index.php/topic,12674.msg318879.html#msg318879).
git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@6865 8e941d3f-bd1b-0410-a28a-d453659cc2b4
This commit is contained in:
wp_xxyyzz
@ -56,7 +56,7 @@ end;
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procedure TGPSListViewer.Populate;
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const
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GPS_FORMAT = '0.000000';
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GPS_FORMAT = '0.00000°';
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var
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i: Integer;
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item: TListItem;
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@ -1,10 +1,10 @@
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object MainForm: TMainForm
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Left = 345
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Height = 545
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Height = 581
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Top = 121
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Width = 869
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Caption = 'MainForm'
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ClientHeight = 545
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ClientHeight = 581
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ClientWidth = 869
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OnCreate = FormCreate
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OnDestroy = FormDestroy
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@ -13,11 +13,11 @@ object MainForm: TMainForm
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LCLVersion = '2.1.0.0'
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object ControlPanel: TPanel
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Left = 592
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Height = 545
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Height = 581
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Top = 0
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Width = 277
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Align = alRight
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ClientHeight = 545
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ClientHeight = 581
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ClientWidth = 277
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TabOrder = 1
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object CbProviders: TComboBox
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@ -145,11 +145,11 @@ object MainForm: TMainForm
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Left = 16
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Height = 15
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Top = 23
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Width = 46
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Width = 43
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BorderSpacing.Left = 16
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BorderSpacing.Top = 4
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BorderSpacing.Bottom = 8
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Caption = 'Latitude:'
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Caption = 'Latitude'
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ParentColor = False
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end
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object InfoPositionLongitude: TLabel
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@ -195,11 +195,11 @@ object MainForm: TMainForm
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AnchorSideRight.Side = asrBottom
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Left = 9
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Height = 66
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Top = 185
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Top = 181
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Width = 259
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Anchors = [akTop, akLeft, akRight]
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AutoSize = True
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BorderSpacing.Top = 12
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BorderSpacing.Top = 8
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Caption = 'Center'
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ClientHeight = 46
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ClientWidth = 255
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@ -223,11 +223,11 @@ object MainForm: TMainForm
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Left = 16
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Height = 15
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Top = 23
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Width = 46
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Width = 43
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BorderSpacing.Left = 16
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BorderSpacing.Top = 4
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BorderSpacing.Bottom = 8
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Caption = 'Latitude:'
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Caption = 'Latitude'
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ParentColor = False
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end
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object InfoCenterLongitude: TLabel
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@ -272,7 +272,7 @@ object MainForm: TMainForm
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AnchorSideRight.Control = BtnSearch
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Left = 9
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Height = 23
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Top = 264
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Top = 334
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Width = 190
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Anchors = [akTop, akLeft, akRight]
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BorderSpacing.Right = 8
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@ -283,13 +283,13 @@ object MainForm: TMainForm
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Text = 'New York'
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end
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object BtnSearch: TButton
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AnchorSideTop.Control = GbCenterCoords
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AnchorSideTop.Control = GbScreenSize
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AnchorSideTop.Side = asrBottom
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AnchorSideRight.Control = GbCenterCoords
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AnchorSideRight.Side = asrBottom
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Left = 207
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Height = 25
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Top = 263
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Top = 333
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Width = 61
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Anchors = [akTop, akRight]
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AutoSize = True
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@ -305,7 +305,7 @@ object MainForm: TMainForm
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AnchorSideRight.Control = BtnGoTo
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Left = 9
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Height = 21
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Top = 318
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Top = 388
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Width = 196
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Anchors = [akTop, akLeft, akRight]
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BorderSpacing.Top = 4
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@ -325,7 +325,7 @@ object MainForm: TMainForm
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AnchorSideTop.Side = asrBottom
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Left = 9
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Height = 15
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Top = 299
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Top = 369
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Width = 177
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BorderSpacing.Top = 12
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Caption = 'Select one of the found locations:'
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@ -338,7 +338,7 @@ object MainForm: TMainForm
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AnchorSideRight.Side = asrBottom
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Left = 213
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Height = 25
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Top = 316
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Top = 386
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Width = 55
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Anchors = [akTop, akRight]
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AutoSize = True
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@ -354,7 +354,7 @@ object MainForm: TMainForm
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AnchorSideRight.Side = asrBottom
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Left = 8
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Height = 52
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Top = 380
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Top = 450
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Width = 260
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Anchors = [akTop, akLeft, akRight]
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AutoSize = False
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@ -368,7 +368,7 @@ object MainForm: TMainForm
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AnchorSideTop.Side = asrBottom
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Left = 8
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Height = 25
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Top = 347
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Top = 417
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Width = 92
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AutoSize = True
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BorderSpacing.Top = 8
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@ -383,8 +383,8 @@ object MainForm: TMainForm
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AnchorSideRight.Control = InfoBtnGPSPoints
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AnchorSideRight.Side = asrBottom
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Left = 8
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Height = 80
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Top = 432
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Height = 64
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Top = 502
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Width = 260
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Anchors = [akTop, akLeft, akRight]
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AutoSize = False
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@ -498,7 +498,7 @@ object MainForm: TMainForm
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AnchorSideTop.Control = BtnGPSPoints
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Left = 108
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Height = 25
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Top = 347
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Top = 417
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Width = 110
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AutoSize = True
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BorderSpacing.Left = 8
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@ -506,10 +506,110 @@ object MainForm: TMainForm
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OnClick = BtnSaveToFileClick
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TabOrder = 11
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end
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object GbScreenSize: TGroupBox
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AnchorSideLeft.Control = GbCenterCoords
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AnchorSideTop.Control = GbCenterCoords
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AnchorSideTop.Side = asrBottom
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AnchorSideRight.Control = GbCenterCoords
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AnchorSideRight.Side = asrBottom
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Left = 9
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Height = 66
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Top = 255
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Width = 259
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Anchors = [akTop, akLeft, akRight]
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AutoSize = True
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BorderSpacing.Top = 8
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Caption = 'Viewport size'
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ClientHeight = 46
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ClientWidth = 255
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TabOrder = 12
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object LblViewportWidth: TLabel
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AnchorSideLeft.Control = GbScreenSize
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AnchorSideTop.Control = GbScreenSize
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Left = 16
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Height = 15
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Top = 4
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Width = 32
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BorderSpacing.Left = 16
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BorderSpacing.Top = 4
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Caption = 'Width'
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ParentColor = False
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end
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object LblViewportHeight: TLabel
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AnchorSideLeft.Control = GbScreenSize
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AnchorSideTop.Control = LblViewportWidth
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AnchorSideTop.Side = asrBottom
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Left = 16
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Height = 15
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Top = 23
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Width = 36
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BorderSpacing.Left = 16
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BorderSpacing.Top = 4
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BorderSpacing.Bottom = 8
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Caption = 'Height'
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ParentColor = False
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end
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object InfoViewportWidth: TLabel
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AnchorSideTop.Control = GbScreenSize
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AnchorSideRight.Control = GbScreenSize
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AnchorSideRight.Side = asrBottom
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Left = 205
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Height = 15
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Top = 4
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Width = 34
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Alignment = taRightJustify
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Anchors = [akTop, akRight]
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BorderSpacing.Top = 4
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BorderSpacing.Right = 16
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Caption = 'Label2'
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ParentColor = False
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end
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object InfoViewportHeight: TLabel
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AnchorSideTop.Control = InfoViewportWidth
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AnchorSideTop.Side = asrBottom
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AnchorSideRight.Control = GbScreenSize
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AnchorSideRight.Side = asrBottom
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Left = 205
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Height = 15
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Top = 23
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Width = 34
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Alignment = taRightJustify
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Anchors = [akTop, akRight]
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BorderSpacing.Top = 4
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BorderSpacing.Right = 16
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BorderSpacing.Bottom = 8
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Caption = 'Label2'
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ParentColor = False
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end
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end
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object CbDistanceUnits: TComboBox
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AnchorSideTop.Control = GbCenterCoords
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AnchorSideTop.Side = asrBottom
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AnchorSideRight.Control = GbCenterCoords
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AnchorSideRight.Side = asrBottom
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Left = 176
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Height = 23
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Top = 253
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Width = 76
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Anchors = [akTop, akLeft, akRight]
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BorderSpacing.Top = 6
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BorderSpacing.Right = 16
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ItemHeight = 15
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ItemIndex = 1
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Items.Strings = (
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'm'
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'km'
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'miles'
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)
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OnChange = CbDistanceUnitsChange
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Style = csDropDownList
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TabOrder = 13
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Text = 'km'
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end
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end
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object MapView: TMapView
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Left = 0
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Height = 545
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Height = 581
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Hint = 'Displays the map'
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Top = 0
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Width = 592
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@ -523,6 +623,7 @@ object MainForm: TMainForm
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UseThreads = True
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Zoom = 0
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OnZoomChange = MapViewZoomChange
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OnChange = MapViewChange
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OnDrawGpsPoint = MapViewDrawGpsPoint
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OnMouseMove = MapViewMouseMove
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OnMouseUp = MapViewMouseUp
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@ -24,13 +24,19 @@ type
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CbProviders: TComboBox;
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CbUseThreads: TCheckBox;
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CbMouseCoords: TGroupBox;
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CbDistanceUnits: TComboBox;
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GbCenterCoords: TGroupBox;
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GbScreenSize: TGroupBox;
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InfoCenterLatitude: TLabel;
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InfoViewportHeight: TLabel;
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InfoCenterLongitude: TLabel;
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InfoBtnGPSPoints: TLabel;
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GPSPointInfo: TLabel;
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InfoViewportWidth: TLabel;
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Label8: TLabel;
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LblCenterLatitude: TLabel;
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LblViewportHeight: TLabel;
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LblViewportWidth: TLabel;
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LblPositionLongitude: TLabel;
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LblPositionLatitude: TLabel;
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InfoPositionLongitude: TLabel;
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@ -53,11 +59,13 @@ type
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ARect: TRect; State: TOwnerDrawState);
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procedure CbProvidersChange(Sender: TObject);
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procedure CbUseThreadsChange(Sender: TObject);
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procedure CbDistanceUnitsChange(Sender: TObject);
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procedure FormCreate(Sender: TObject);
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procedure FormDestroy(Sender: TObject);
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procedure FormShow(Sender: TObject);
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procedure GeoNamesNameFound(const AName: string; const ADescr: String;
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const ALoc: TRealPoint);
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procedure MapViewChange(Sender: TObject);
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procedure MapViewDrawGpsPoint(Sender, ACanvas: TObject; APoint: TGpsPoint);
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procedure MapViewMouseMove(Sender: TObject; Shift: TShiftState; X,
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Y: Integer);
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@ -72,6 +80,7 @@ type
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procedure ClearFoundLocations;
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procedure UpdateDropdownWidth(ACombobox: TCombobox);
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procedure UpdateLocationHistory(ALocation: String);
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procedure UpdateViewportSize;
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public
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procedure ReadFromIni;
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@ -88,7 +97,7 @@ implementation
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uses
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LCLType, IniFiles, Math, FPCanvas, FPImage, IntfGraphics,
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mvExtraData,
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mvEngine, mvExtraData,
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gpslistform;
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type
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@ -227,6 +236,11 @@ begin
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MapView.UseThreads := CbUseThreads.Checked;
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end;
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procedure TMainForm.CbDistanceUnitsChange(Sender: TObject);
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begin
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UpdateViewPortSize;
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end;
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procedure TMainForm.ClearFoundLocations;
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var
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i: Integer;
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@ -276,6 +290,11 @@ begin
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CbFoundLocations.Items.AddObject(AName, P);
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end;
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procedure TMainForm.MapViewChange(Sender: TObject);
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begin
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UpdateViewportSize;
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end;
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procedure TMainForm.MapViewDrawGpsPoint(Sender, ACanvas: TObject;
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APoint: TGpsPoint);
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const
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@ -332,12 +351,20 @@ var
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i: Integer;
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begin
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rPt := MapView.Center;
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InfoCenterLongitude.Caption := Format('%.6f° = %s', [rPt.Lon, GPSToDMS(rPt.Lon)]);
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InfoCenterLatitude.Caption := Format('%.6f° = %s', [rPt.Lat, GPSToDMS(rPt.Lat)]);
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{
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InfoCenterLongitude.Caption := Format('%.6f°', [rPt.Lon]);
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InfoCenterLatitude.Caption := Format('%.6f°', [rPt.Lat]);
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}
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rPt := MapView.ScreenToLonLat(Point(X, Y));
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InfoPositionLongitude.Caption := Format('%.6f° = %s', [rPt.Lon, GPSToDMS(rPt.Lon)]);
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InfoPositionLatitude.Caption := Format('%.6f° = %s', [rPt.Lat, GPSToDMS(rPt.Lat)]);
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{
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InfoPositionLongitude.Caption := Format('%.6f°', [rPt.Lon]);
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InfoPositionLatitude.Caption := Format('%.6f°', [rPt.Lat]);
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}
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rArea.TopLeft := MapView.ScreenToLonLat(Point(X-DELTA, Y-DELTA));
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rArea.BottomRight := MapView.ScreenToLonLat(Point(X+DELTA, Y+DELTA));
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@ -349,7 +376,11 @@ begin
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for i:=0 to gpsList.Count-1 do
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if gpsList[i] is TGpsPoint then
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with TGpsPoint(gpsList[i]) do
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L.Add(Format('%s' + Lineending + ' (lat=%.6f°, lon=%.6f°)', [Name, Lat, Lon]));
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L.Add(Format('%s' + Lineending + ' (lat=%.6f°=%s, lon=%.6f°=%s°)', [
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Name, Lat, GPSToDMS(Lat), Lon, GPSToDMS(Lon)
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]));
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//L.Add(Format('%s' + Lineending + ' (lat=%.6f°, lon=%.6f°)', [Name, Lat, Lon]));
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GPSPointInfo.Caption := L.Text;
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finally
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L.Free;
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@ -470,6 +501,30 @@ begin
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CbLocations.Text := ALocation;
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end;
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procedure TMainForm.UpdateViewportSize;
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begin
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InfoViewportWidth.Caption := Format('%.2n %s', [
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CalcGeoDistance(
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MapView.GetVisibleArea.TopLeft.Lat,
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MapView.GetVisibleArea.TopLeft.Lon,
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MapView.GetVisibleArea.TopLeft.Lat,
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MapView.GetVisibleArea.BottomRight.Lon,
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TDistanceUnits(cbDistanceUnits.ItemIndex)
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),
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cbDistanceUnits.Items[cbDistanceUnits.ItemIndex]
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]);
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InfoViewportHeight.Caption := Format('%.2n %s', [
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CalcGeoDistance(
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MapView.GetVisibleArea.TopLeft.Lat,
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MapView.GetVisibleArea.TopLeft.Lon,
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MapView.GetVisibleArea.BottomRight.Lat,
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MapView.GetVisibleArea.TopLeft.Lon,
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TDistanceUnits(cbDistanceUnits.ItemIndex)
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),
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cbDistanceUnits.Items[cbDistanceUnits.ItemIndex]
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]);
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end;
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procedure TMainForm.WriteToIni;
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var
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ini: TCustomIniFile;
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@ -44,6 +44,8 @@ Type
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TTileIdArray = Array of TTileId;
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TDistanceUnits = (duMeters, duKilometers, duMiles);
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{ TMapWindow }
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TMapWindow = Record
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@ -161,6 +163,13 @@ Type
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property OnZoomChange: TNotifyEvent read FOnZoomChange write FOnZoomChange;
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end;
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function CalcGeoDistance(Lat1, Lon1, Lat2, Lon2: double;
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AUnits: TDistanceUnits = duKilometers): double;
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function GPSToDMS(Angle: Double): string;
|
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procedure SplitGps(AValue: Double; out ADegs, AMins, ASecs: Double);
|
||||
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||||
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||||
implementation
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||||
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||||
@ -1090,5 +1099,65 @@ begin
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end;
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||||
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||||
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||||
//------------------------------------------------------------------------------
|
||||
|
||||
procedure SplitGps(AValue: Double; out ADegs, AMins: Double);
|
||||
begin
|
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AValue := abs(AValue);
|
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AMins := frac(AValue) * 60;
|
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ADegs := trunc(AValue);
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end;
|
||||
|
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procedure SplitGps(AValue: Double; out ADegs, AMins, ASecs: Double);
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begin
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SplitGps(AValue, ADegs, AMins);
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ASecs := frac(AMins) * 60;
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AMins := trunc(AMins);
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end;
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|
||||
function GPSToDMS(Angle: Double): string;
|
||||
var
|
||||
deg, min, sec: Double;
|
||||
begin
|
||||
SplitGPS(Angle, deg, min, sec);
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Result := Format('%.0f° %.0f'' %.1f"', [deg, min, sec]);
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||||
end;
|
||||
|
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{ Returns the direct distance (air-line) between two geo coordinates
|
||||
If latitude NOT between -90°..+90° and longitude NOT between -180°..+180°
|
||||
the function returns -1.
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||||
Usage: FindDistance(51.53323, -2.90130, 51.29442, -2.27275, duKilometers);
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||||
}
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function CalcGeoDistance(Lat1, Lon1, Lat2, Lon2: double;
|
||||
AUnits: TDistanceUnits = duKilometers): double;
|
||||
const
|
||||
raduis_km: double = 6371.0; // generalized radius of earth
|
||||
var
|
||||
d_radians: double; // distance in radians
|
||||
lat1r, lon1r, lat2r, lon2r: double;
|
||||
begin
|
||||
// Validate
|
||||
if (Lat1 < -90.0) or (Lat1 > 90.0) then exit(-1);
|
||||
if (Lon1 < -180.0) or (Lon1 > 180.0) then exit(-1);
|
||||
if (Lat2 < -90.0) or (Lat2 > 90.0) then exit(-1);
|
||||
if (Lon2 < -180.0) or (Lon2 > 180.0) then exit(-1);
|
||||
|
||||
// Turn lat and lon into radian measures
|
||||
lat1r := (PI / 180.0) * Lat1;
|
||||
lon1r := (PI / 180.0) * Lon1;
|
||||
lat2r := (PI / 180.0) * Lat2;
|
||||
lon2r := (PI / 180.0) * Lon2;
|
||||
|
||||
// calc
|
||||
d_radians := arccos(Sin(lat1r) * sin(lat2r) + cos(lat1r) * cos(lat2r) * cos(lon1r - lon2r));
|
||||
Result := EARTH_RADIUS * d_radians;
|
||||
|
||||
case AUnits of
|
||||
duMeters: ;
|
||||
duKilometers: Result := Result * 1E-3;
|
||||
duMiles: Result := Result * 0.62137E-3;
|
||||
end;
|
||||
end;
|
||||
|
||||
end.
|
||||
|
||||
|
||||
Reference in New Issue
Block a user