Class TEnvelope

Unit

Declaration

type TEnvelope = class()

Description

Methods

Overview

	procedure addBorder(radius: Double);
	function calcDistance(lat1: Double; lon1: Double; lat2: Double; lon2: Double): Double;
	function calcMeasure(imageWidth: Integer; measureWidth: Integer; minx: Double; miny: Double; maxx: Double; maxy: Double): Integer; overload;
	function calcMeasure(imageWidth: Integer; measureWidth: Integer): Integer; overload;
	function calcScale(dpi, imageWidth, imageHeight: Integer; minx: Double; miny: Double; maxx: Double; maxy: Double): Integer; overload;
	function calcScale(dpi, imageWidth, imageHeight: Integer): Integer; overload;
	procedure center(centerx: Double; centery: Double);
	constructor Create(centerx: Double; centery: Double; radius: Double); overload;
	constructor Create(minx: String; miny: String; maxx: String; maxy: String); overload;
	constructor Create(minx: Double; miny: Double; maxx: Double; maxy: Double); overload;
	constructor Create(); overload;
	function getMaxX: Double;
	function getMaxY: Double;
	function getMinX: Double;
	function getMinY: Double;
	procedure move(distx: Double; disty: Double);
	procedure overlay(other: TEnvelope);
	procedure stretch(factor: Double; centerx: Double; centery: Double); overload;
	procedure stretch(factor: Double); overload;
	function toString(): String;

Description

procedure addBorder(radius: Double);

expand the envelope with the spec. radius

function calcDistance(lat1: Double; lon1: Double; lat2: Double; lon2: Double): Double;

evaluates the distance between two points (only for longitudes and latititudes)

function calcMeasure(imageWidth: Integer; measureWidth: Integer; minx: Double; miny: Double; maxx: Double; maxy: Double): Integer; overload;

evaluates the scale of the envelope with the resolution of the image (only for longitudes and latititudes)

function calcMeasure(imageWidth: Integer; measureWidth: Integer): Integer; overload;

evaluates the measure of the envelope with the resolution of the image (only for longitudes and latititudes)

function calcScale(dpi, imageWidth, imageHeight: Integer; minx: Double; miny: Double; maxx: Double; maxy: Double): Integer; overload;

evaluates the scale of a spec. envelope with the resolution of the image (only for longitudes and latititudes)

function calcScale(dpi, imageWidth, imageHeight: Integer): Integer; overload;

evaluates the scale of the envelope with the resolution of the image (only for longitudes and latititudes)

procedure center(centerx: Double; centery: Double);

sets a new center, the dimension are the same

constructor Create(centerx: Double; centery: Double; radius: Double); overload;

creates an envelope with centered position and a radius

constructor Create(minx: String; miny: String; maxx: String; maxy: String); overload;

creates an envelope with the specified coordinates

constructor Create(minx: Double; miny: Double; maxx: Double; maxy: Double); overload;

creates an envelope with the specified coordinates

constructor Create(); overload;

creates an envelope with the coordinates 0, 0, 0, 0

function getMaxX: Double;

gets the max. X

function getMaxY: Double;

gets the max. Y

function getMinX: Double;

gets the min. X

function getMinY: Double;

gets the min. Y

procedure move(distx: Double; disty: Double);

moves the envelope in the specified direction (vector)

procedure overlay(other: TEnvelope);

combine two envlopes to one, the new envelope includes the two before specified envelopes

procedure stretch(factor: Double; centerx: Double; centery: Double); overload;

stretches the envelope with the spec. factor and sets a new center

procedure stretch(factor: Double); overload;

stretches the envelope with the spec. factor

function toString(): String;

returns the envelope as a string