com.itextpdf.layout.borders.Border Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2019 iText Group NV
Authors: Bruno Lowagie, Paulo Soares, et al.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
as published by the Free Software Foundation with the addition of the
following permission added to Section 15 as permitted in Section 7(a):
FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
OF THIRD PARTY RIGHTS
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program; if not, see http://www.gnu.org/licenses or write to
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You can be released from the requirements of the license by purchasing
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*/
package com.itextpdf.layout.borders;
import com.itextpdf.io.LogMessageConstant;
import com.itextpdf.io.util.MessageFormatUtil;
import com.itextpdf.kernel.colors.Color;
import com.itextpdf.kernel.colors.ColorConstants;
import com.itextpdf.kernel.geom.Point;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.property.TransparentColor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Represents a border.
*/
public abstract class Border {
/**
* The null Border, i.e. the presence of such border is equivalent to the absence of the border
*/
public static final Border NO_BORDER = null;
/**
* Value used by discontinuous borders during the drawing process
*/
private static final float CURV = 0.447f;
/**
* The solid border.
*
* @see SolidBorder
*/
public static final int SOLID = 0;
/**
* The dashed border.
*
* @see DashedBorder
*/
public static final int DASHED = 1;
/**
* The dotted border.
*
* @see DottedBorder
*/
public static final int DOTTED = 2;
/**
* The double border.
*
* @see DoubleBorder
*/
public static final int DOUBLE = 3;
/**
* The round-dots border.
*
* @see RoundDotsBorder
*/
public static final int ROUND_DOTS = 4;
/**
* The 3D groove border.
*
* @see GrooveBorder
*/
public static final int _3D_GROOVE = 5;
/**
* The 3D inset border.
*
* @see InsetBorder
*/
public static final int _3D_INSET = 6;
/**
* The 3D outset border.
*
* @see OutsetBorder
*/
public static final int _3D_OUTSET = 7;
/**
* The 3D ridge border.
*
* @see RidgeBorder
*/
public static final int _3D_RIDGE = 8;
/**
* The color of the border.
*
* @see TransparentColor
*/
protected TransparentColor transparentColor;
/**
* The width of the border.
*/
protected float width;
/**
* The type of the border.
*/
protected int type;
/**
* The hash value for the border.
*/
private int hash;
/**
* Creates a {@link Border border} with the given width.
* The {@link Color color} to be set by default is black
*
* @param width the width which the border should have
*/
protected Border(float width) {
this(ColorConstants.BLACK, width);
}
/**
* Creates a {@link Border border} with given width and {@link Color color}.
*
* @param color the color which the border should have
* @param width the width which the border should have
*/
protected Border(Color color, float width) {
this.transparentColor = new TransparentColor(color);
this.width = width;
}
/**
* Creates a {@link Border border} with given width, {@link Color color} and opacity.
*
* @param color the color which the border should have
* @param width the width which the border should have
* @param opacity the opacity which border should have; a float between 0 and 1, where 1 stands for fully opaque color and 0 - for fully transparent
*/
protected Border(Color color, float width, float opacity) {
this.transparentColor = new TransparentColor(color, opacity);
this.width = width;
}
/**
* All borders are supposed to be drawn in such way, that inner content of the element is on the right from the
* drawing direction. Borders are drawn in this order: top, right, bottom, left.
*
* Given points specify the line which lies on the border of the content area,
* therefore the border itself should be drawn to the left from the drawing direction.
*
* borderWidthBefore and borderWidthAfter parameters are used to
* define the widths of the borders that are before and after the current border, e.g. for
* the bottom border, borderWidthBefore specifies width of the right border and
* borderWidthAfter - width of the left border. Those width are used to handle areas
* of border joins.
*
* @param canvas PdfCanvas to be written to
* @param x1 x coordinate of the beginning point of the element side, that should be bordered
* @param y1 y coordinate of the beginning point of the element side, that should be bordered
* @param x2 x coordinate of the ending point of the element side, that should be bordered
* @param y2 y coordinate of the ending point of the element side, that should be bordered
* @param defaultSide the {@link Border.Side}, that we will fallback to, if it cannot be determined by border coordinates
* @param borderWidthBefore defines width of the border that is before the current one
* @param borderWidthAfter defines width of the border that is after the current one
*/
public abstract void draw(PdfCanvas canvas, float x1, float y1, float x2, float y2, Side defaultSide, float borderWidthBefore, float borderWidthAfter);
/**
* All borders are supposed to be drawn in such way, that inner content of the element is on the right from the
* drawing direction. Borders are drawn in this order: top, right, bottom, left.
*
* Given points specify the line which lies on the border of the content area,
* therefore the border itself should be drawn to the left from the drawing direction.
*
* borderWidthBefore and borderWidthAfter parameters are used to
* define the widths of the borders that are before and after the current border, e.g. for
* the bottom border, borderWidthBefore specifies width of the right border and
* borderWidthAfter - width of the left border. Those width are used to handle areas
* of border joins.
*
* borderRadius is used to draw rounded borders.
*
* @param canvas PdfCanvas to be written to
* @param x1 x coordinate of the beginning point of the element side, that should be bordered
* @param y1 y coordinate of the beginning point of the element side, that should be bordered
* @param x2 x coordinate of the ending point of the element side, that should be bordered
* @param y2 y coordinate of the ending point of the element side, that should be bordered
* @param borderRadius defines the radius of the element's corners
* @param defaultSide the {@link Border.Side}, that we will fallback to, if it cannot be determined by border coordinates
* @param borderWidthBefore defines width of the border that is before the current one
* @param borderWidthAfter defines width of the border that is after the current one
*/
public void draw(PdfCanvas canvas, float x1, float y1, float x2, float y2, float borderRadius, Side defaultSide, float borderWidthBefore, float borderWidthAfter) {
draw(canvas, x1, y1, x2, y2, borderRadius, borderRadius, borderRadius, borderRadius, defaultSide, borderWidthBefore, borderWidthAfter);
}
/**
* All borders are supposed to be drawn in such way, that inner content of the element is on the right from the
* drawing direction. Borders are drawn in this order: top, right, bottom, left.
*
* Given points specify the line which lies on the border of the content area,
* therefore the border itself should be drawn to the left from the drawing direction.
*
* borderWidthBefore and borderWidthAfter parameters are used to
* define the widths of the borders that are before and after the current border, e.g. for
* the bottom border, borderWidthBefore specifies width of the right border and
* borderWidthAfter - width of the left border. Those width are used to handle areas
* of border joins.
*
* horizontalRadius1, verticalRadius1, horizontalRadius2
* and verticalRadius2 are used to draw rounded borders.
*
* @param canvas PdfCanvas to be written to
* @param x1 x coordinate of the beginning point of the element side, that should be bordered
* @param y1 y coordinate of the beginning point of the element side, that should be bordered
* @param x2 x coordinate of the ending point of the element side, that should be bordered
* @param y2 y coordinate of the ending point of the element side, that should be bordered
* @param horizontalRadius1 defines the horizontal radius of the border's first corner
* @param verticalRadius1 defines the vertical radius of the border's first corner
* @param horizontalRadius2 defines the horizontal radius of the border's second corner
* @param verticalRadius2 defines the vertical radius of the border's second corner
* @param defaultSide the {@link Border.Side}, that we will fallback to, if it cannot be determined by border coordinates
* @param borderWidthBefore defines width of the border that is before the current one
* @param borderWidthAfter defines width of the border that is after the current one
*/
public void draw(PdfCanvas canvas, float x1, float y1, float x2, float y2, float horizontalRadius1, float verticalRadius1, float horizontalRadius2, float verticalRadius2, Side defaultSide, float borderWidthBefore, float borderWidthAfter) {
Logger logger = LoggerFactory.getLogger(Border.class);
logger.warn(MessageFormatUtil.format(LogMessageConstant.METHOD_IS_NOT_IMPLEMENTED_BY_DEFAULT_OTHER_METHOD_WILL_BE_USED,
"Border#draw(PdfCanvas, float, float, float, float, float, float, float, float, Side, float, float",
"Border#draw(PdfCanvas, float, float, float, float, Side, float, float)"));
draw(canvas, x1, y1, x2, y2, defaultSide, borderWidthBefore, borderWidthAfter);
}
/**
* Draws the border of a cell.
*
* @param canvas PdfCanvas to be written to
* @param x1 x coordinate of the beginning point of the element side, that should be bordered
* @param y1 y coordinate of the beginning point of the element side, that should be bordered
* @param x2 x coordinate of the ending point of the element side, that should be bordered
* @param y2 y coordinate of the ending point of the element side, that should be bordered
* @param defaultSide the {@link Border.Side}, that we will fallback to, if it cannot be determined by border coordinates
*/
public abstract void drawCellBorder(PdfCanvas canvas, float x1, float y1, float x2, float y2, Side defaultSide);
/**
* Returns the type of the {@link Border border}
*
* @return the type of border.
*/
public abstract int getType();
/**
* Gets the {@link Color color} of the {@link Border border}
*
* @return the {@link Color color}
*/
public Color getColor() {
return transparentColor.getColor();
}
/**
* Gets the opacity of the {@link Border border}
*
* @return the border opacity; a float between 0 and 1, where 1 stands for fully opaque color and 0 - for fully transparent
*/
public float getOpacity() {
return transparentColor.getOpacity();
}
/**
* Gets the width of the {@link Border border}
*
* @return the width
*/
public float getWidth() {
return width;
}
/**
* Sets the {@link Color color} of the {@link Border border}
*
* @param color The color
*/
public void setColor(Color color) {
this.transparentColor = new TransparentColor(color, this.transparentColor.getOpacity());
}
/**
* Sets the width of the {@link Border border}
*
* @param width The width
*/
public void setWidth(float width) {
this.width = width;
}
/**
* Indicates whether the border is equal to the given border.
* The border type, width and color are considered during the comparison.
*/
@Override
public boolean equals(Object anObject) {
if (this == anObject) {
return true;
}
if (anObject instanceof Border) {
Border anotherBorder = (Border) anObject;
if (anotherBorder.getType() != getType()
|| !anotherBorder.getColor().equals(getColor())
|| anotherBorder.getWidth() != getWidth()
|| anotherBorder.transparentColor.getOpacity() != transparentColor.getOpacity()) {
return false;
}
} else {
return false;
}
return true;
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
int h = hash;
if (h == 0) {
h = (int) getWidth() * 31 + getColor().hashCode();
h = h * 31 + (int) transparentColor.getOpacity();
hash = h;
}
return h;
}
/**
* Returns the {@link Side side} corresponded to the line between two points.
* Notice that we consider the rectangle traversal to be clockwise.
* In case side couldn't be detected we will fallback to default side
*
* @param x1 the abscissa of the left-bottom point
* @param y1 the ordinate of the left-bottom point
* @param x2 the abscissa of the right-top point
* @param y2 the ordinate of the right-top point
* @param defaultSide the default side of border
* @return the corresponded {@link Side side}
*/
protected Side getBorderSide(float x1, float y1, float x2, float y2, Side defaultSide) {
boolean isLeft = false;
boolean isRight = false;
if (Math.abs(y2 - y1) > 0.0005f) {
isLeft = y2 - y1 > 0;
isRight = y2 - y1 < 0;
}
boolean isTop = false;
boolean isBottom = false;
if (Math.abs(x2 - x1) > 0.0005f) {
isTop = x2 - x1 > 0;
isBottom = x2 - x1 < 0;
}
if (isTop) {
return isLeft ? Side.LEFT : Side.TOP;
} else if (isRight) {
return Side.RIGHT;
} else if (isBottom) {
return Side.BOTTOM;
} else if (isLeft) {
return Side.LEFT;
}
return defaultSide;
}
/**
* Enumerates the different sides of the rectangle.
* The rectangle sides are expected to be parallel to corresponding page sides
* Otherwise the result is Side.NONE
*/
public enum Side {
NONE, TOP, RIGHT, BOTTOM, LEFT
}
protected Point getIntersectionPoint(Point lineBeg, Point lineEnd, Point clipLineBeg, Point clipLineEnd) {
double A1 = lineBeg.getY() - lineEnd.getY(), A2 = clipLineBeg.getY() - clipLineEnd.getY();
double B1 = lineEnd.getX() - lineBeg.getX(), B2 = clipLineEnd.getX() - clipLineBeg.getX();
double C1 = lineBeg.getX() * lineEnd.getY() - lineBeg.getY() * lineEnd.getX();
double C2 = clipLineBeg.getX() * clipLineEnd.getY() - clipLineBeg.getY() * clipLineEnd.getX();
double M = B1 * A2 - B2 * A1;
return new Point((B2 * C1 - B1 * C2) / M, (C2 * A1 - C1 * A2) / M);
}
/**
* Adjusts the size of the gap between dots
*
* @param distance the {@link Border border} length
* @param initialGap the initial size of the gap
* @return the adjusted size of the gap
*/
protected float getDotsGap(double distance, float initialGap) {
double gapsNum = Math.ceil(distance / initialGap);
if (gapsNum == 0) {
return initialGap;
}
return (float) (distance / gapsNum);
}
/**
* Perform drawing operations to draw discontinuous borders. Used by {@link DashedBorder}, {@link DottedBorder} and {@link RoundDotsBorder}.
*
* @param canvas canvas to draw on
* @param defaultSide the {@link Border.Side}, that we will fallback to, if it cannot be determined by border coordinates
* @param borderWidthBefore defines width of the border that is before the current one
* @param borderWidthAfter defines width of the border that is after the current one
*/
/**
* Perform drawing operations to draw discontinuous borders. Used by {@link DashedBorder}, {@link DottedBorder} and {@link RoundDotsBorder}.
*
* @param canvas canvas to draw on
* @param boundingRectangle rectangle representing the bounding box of the drawing operations
* @param horizontalRadii the horizontal radius of the border's two corners
* @param verticalRadii the vertical radius of the border's two corners
* @param defaultSide the {@link Border.Side}, that we will fallback to, if it cannot be determined by border coordinates
* @param borderWidthBefore defines width of the border that is before the current one
* @param borderWidthAfter defines width of the border that is after the current one
*/
protected void drawDiscontinuousBorders(PdfCanvas canvas, Rectangle boundingRectangle, float[] horizontalRadii, float[] verticalRadii, Side defaultSide, float borderWidthBefore, float borderWidthAfter) {
float x1 = boundingRectangle.getX();
float y1 = boundingRectangle.getY();
float x2 = boundingRectangle.getRight();
float y2 = boundingRectangle.getTop();
float horizontalRadius1 = horizontalRadii[0];
float horizontalRadius2 = horizontalRadii[1];
float verticalRadius1 = verticalRadii[0];
float verticalRadius2 = verticalRadii[1];
// Points (x0, y0) and (x3, y3) are used to produce Bezier curve
float x0 = boundingRectangle.getX();
float y0 = boundingRectangle.getY();
float x3 = boundingRectangle.getRight();
float y3 = boundingRectangle.getTop();
float innerRadiusBefore;
float innerRadiusFirst;
float innerRadiusSecond;
float innerRadiusAfter;
float widthHalf = width / 2;
Point clipPoint1;
Point clipPoint2;
Point clipPoint;
Border.Side borderSide = getBorderSide(x1, y1, x2, y2, defaultSide);
switch (borderSide) {
case TOP:
innerRadiusBefore = Math.max(0, horizontalRadius1 - borderWidthBefore);
innerRadiusFirst = Math.max(0, verticalRadius1 - width);
innerRadiusSecond = Math.max(0, verticalRadius2 - width);
innerRadiusAfter = Math.max(0, horizontalRadius2 - borderWidthAfter);
x0 -= borderWidthBefore / 2;
y0 -= innerRadiusFirst;
x3 += borderWidthAfter / 2;
y3 -= innerRadiusSecond;
clipPoint1 = getIntersectionPoint(new Point(x1 - borderWidthBefore, y1 + width), new Point(x1, y1), new Point(x0, y0), new Point(x0 + 10, y0));
clipPoint2 = getIntersectionPoint(new Point(x2 + borderWidthAfter, y2 + width), new Point(x2, y2), new Point(x3, y3), new Point(x3 - 10, y3));
if (clipPoint1.x > clipPoint2.x) {
clipPoint = getIntersectionPoint(new Point(x1 - borderWidthBefore, y1 + width), clipPoint1, clipPoint2, new Point(x2 + borderWidthAfter, y2 + width));
canvas.moveTo(x1 - borderWidthBefore, y1 + width).lineTo(clipPoint.x, clipPoint.y).lineTo(x2 + borderWidthAfter, y2 + width).lineTo(x1 - borderWidthBefore, y1 + width);
} else {
canvas.moveTo(x1 - borderWidthBefore, y1 + width).lineTo(clipPoint1.x, clipPoint1.y).lineTo(clipPoint2.x, clipPoint2.y).lineTo(x2 + borderWidthAfter, y2 + width).lineTo(x1 - borderWidthBefore, y1 + width);
}
canvas.clip().endPath();
x1 += innerRadiusBefore;
y1 += widthHalf;
x2 -= innerRadiusAfter;
y2 += widthHalf;
canvas
.moveTo(x0, y0).curveTo(x0, y0 + innerRadiusFirst * CURV, x1 - innerRadiusBefore * CURV, y1, x1, y1)
.lineTo(x2, y2)
.curveTo(x2 + innerRadiusAfter * CURV, y2, x3, y3 + innerRadiusSecond * CURV, x3, y3);
break;
case RIGHT:
innerRadiusBefore = Math.max(0, verticalRadius1 - borderWidthBefore);
innerRadiusFirst = Math.max(0, horizontalRadius1 - width);
innerRadiusSecond = Math.max(0, horizontalRadius2 - width);
innerRadiusAfter = Math.max(0, verticalRadius2 - borderWidthAfter);
x0 -= innerRadiusFirst;
y0 += borderWidthBefore / 2;
x3 -= innerRadiusSecond;
y3 -= borderWidthAfter / 2;
clipPoint1 = getIntersectionPoint(new Point(x1 + width, y1 + borderWidthBefore), new Point(x1, y1), new Point(x0, y0), new Point(x0, y0 - 10));
clipPoint2 = getIntersectionPoint(new Point(x2 + width, y2 - borderWidthAfter), new Point(x2, y2), new Point(x3, y3), new Point(x3, y3 - 10));
if (clipPoint1.y < clipPoint2.y) {
clipPoint = getIntersectionPoint(new Point(x1 + width, y1 + borderWidthBefore), clipPoint1, clipPoint2, new Point(x2 + width, y2 - borderWidthAfter));
canvas.moveTo(x1 + width, y1 + borderWidthBefore).lineTo(clipPoint.x, clipPoint.y).lineTo(x2 + width, y2 - borderWidthAfter).lineTo(x1 + width, y1 + borderWidthBefore).clip().endPath();
} else {
canvas.moveTo(x1 + width, y1 + borderWidthBefore).lineTo(clipPoint1.x, clipPoint1.y).lineTo(clipPoint2.x, clipPoint2.y).lineTo(x2 + width, y2 - borderWidthAfter).lineTo(x1 + width, y1 + borderWidthBefore).clip().endPath();
}
canvas.clip().endPath();
x1 += widthHalf;
y1 -= innerRadiusBefore;
x2 += widthHalf;
y2 += innerRadiusAfter;
canvas
.moveTo(x0, y0).curveTo(x0 + innerRadiusFirst * CURV, y0, x1, y1 + innerRadiusBefore * CURV, x1, y1)
.lineTo(x2, y2)
.curveTo(x2, y2 - innerRadiusAfter * CURV, x3 + innerRadiusSecond * CURV, y3, x3, y3);
break;
case BOTTOM:
innerRadiusBefore = Math.max(0, horizontalRadius1 - borderWidthBefore);
innerRadiusFirst = Math.max(0, verticalRadius1 - width);
innerRadiusSecond = Math.max(0, verticalRadius2 - width);
innerRadiusAfter = Math.max(0, horizontalRadius2 - borderWidthAfter);
x0 += borderWidthBefore / 2;
y0 += innerRadiusFirst;
x3 -= borderWidthAfter / 2;
y3 += innerRadiusSecond;
clipPoint1 = getIntersectionPoint(new Point(x1 + borderWidthBefore, y1 - width), new Point(x1, y1), new Point(x0, y0), new Point(x0 - 10, y0));
clipPoint2 = getIntersectionPoint(new Point(x2 - borderWidthAfter, y2 - width), new Point(x2, y2), new Point(x3, y3), new Point(x3 + 10, y3));
if (clipPoint1.x < clipPoint2.x) {
clipPoint = getIntersectionPoint(new Point(x1 + borderWidthBefore, y1 - width), clipPoint1, clipPoint2, new Point(x2 - borderWidthAfter, y2 - width));
canvas.moveTo(x1 + borderWidthBefore, y1 - width).lineTo(clipPoint.x, clipPoint.y).lineTo(x2 - borderWidthAfter, y2 - width).lineTo(x1 + borderWidthBefore, y1 - width);
} else {
canvas.moveTo(x1 + borderWidthBefore, y1 - width).lineTo(clipPoint1.x, clipPoint1.y).lineTo(clipPoint2.x, clipPoint2.y).lineTo(x2 - borderWidthAfter, y2 - width).lineTo(x1 + borderWidthBefore, y1 - width);
}
canvas.clip().endPath();
x1 -= innerRadiusBefore;
y1 -= widthHalf;
x2 += innerRadiusAfter;
y2 -= widthHalf;
canvas
.moveTo(x0, y0).curveTo(x0, y0 - innerRadiusFirst * CURV, x1 + innerRadiusBefore * CURV, y1, x1, y1)
.lineTo(x2, y2)
.curveTo(x2 - innerRadiusAfter * CURV, y2, x3, y3 - innerRadiusSecond * CURV, x3, y3);
break;
case LEFT:
innerRadiusBefore = Math.max(0, verticalRadius1 - borderWidthBefore);
innerRadiusFirst = Math.max(0, horizontalRadius1 - width);
innerRadiusSecond = Math.max(0, horizontalRadius2 - width);
innerRadiusAfter = Math.max(0, verticalRadius2 - borderWidthAfter);
x0 += innerRadiusFirst;
y0 -= borderWidthBefore / 2;
x3 += innerRadiusSecond;
y3 += borderWidthAfter / 2;
clipPoint1 = getIntersectionPoint(new Point(x1 - width, y1 - borderWidthBefore), new Point(x1, y1), new Point(x0, y0), new Point(x0, y0 + 10));
clipPoint2 = getIntersectionPoint(new Point(x2 - width, y2 + borderWidthAfter), new Point(x2, y2), new Point(x3, y3), new Point(x3, y3 + 10));
if (clipPoint1.y > clipPoint2.y) {
clipPoint = getIntersectionPoint(new Point(x1 - width, y1 - borderWidthBefore), clipPoint1, clipPoint2, new Point(x2 - width, y2 + borderWidthAfter));
canvas.moveTo(x1 - width, y1 - borderWidthBefore).lineTo(clipPoint.x, clipPoint.y).lineTo(x2 - width, y2 + borderWidthAfter).lineTo(x1 - width, y1 - borderWidthBefore);
} else {
canvas.moveTo(x1 - width, y1 - borderWidthBefore).lineTo(clipPoint1.x, clipPoint1.y).lineTo(clipPoint2.x, clipPoint2.y).lineTo(x2 - width, y2 + borderWidthAfter).lineTo(x1 - width, y1 - borderWidthBefore);
}
canvas.clip().endPath();
x1 -= widthHalf;
y1 += innerRadiusBefore;
x2 -= widthHalf;
y2 -= innerRadiusAfter;
canvas
.moveTo(x0, y0).curveTo(x0 - innerRadiusFirst * CURV, y0, x1, y1 - innerRadiusBefore * CURV, x1, y1)
.lineTo(x2, y2)
.curveTo(x2, y2 + innerRadiusAfter * CURV, x3 - innerRadiusSecond * CURV, y3, x3, y3);
break;
default:
break;
}
canvas
.stroke()
.restoreState();
}
/**
* Calculate adjusted starting points for discontinuous borders, given two opposing points (A and B) that define the bounding rectangle
*
* @param x1 x-coordinate of point A
* @param y1 y-ordinate of point A
* @param x2 x-coordinate of point B
* @param y2 y-ordinate of point B
* @param defaultSide default side of the border used to determine the side given by points A and B
* @return float[] containing the adjusted starting points in the form {x1,y1,x2,y2}
*/
protected float[] getStartingPointsForBorderSide(float x1, float y1, float x2, float y2, Side defaultSide) {
float widthHalf = width / 2;
Border.Side borderSide = getBorderSide(x1, y1, x2, y2, defaultSide);
switch (borderSide) {
case TOP:
y1 += widthHalf;
y2 += widthHalf;
break;
case RIGHT:
x1 += widthHalf;
x2 += widthHalf;
break;
case BOTTOM:
y1 -= widthHalf;
y2 -= widthHalf;
break;
case LEFT:
x1 -= widthHalf;
x2 -= widthHalf;
break;
default:
break;
}
return new float[]{x1, y1, x2, y2};
}
}