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// This file is part of Golly.
// See docs/License.html for the copyright notice.
#ifndef _SELECT_H_
#define _SELECT_H_
#include "bigint.h" // for bigint
#include "lifealgo.h" // for lifealgo
#include "utils.h" // for gRect
// Most editing functions operate on the current selection.
// The Selection class encapsulates all selection-related operations.
class Selection {
public:
Selection();
Selection(int t, int l, int b, int r);
~Selection();
bool operator==(const Selection& sel) const;
bool operator!=(const Selection& sel) const;
bool Exists();
// return true if the selection exists
void Deselect();
// remove the selection
bool TooBig();
// return true if any selection edge is outside the editable limits
void DisplaySize();
// display the selection's size in the status bar
void SetRect(int x, int y, int wd, int ht);
// set the selection to the given rectangle
void GetRect(int* x, int* y, int* wd, int* ht);
// return the selection rectangle
void SetEdges(bigint& t, bigint& l, bigint& b, bigint& r);
// set the selection using the given rectangle edges
void CheckGridEdges();
// change selection edges if necessary to ensure they are inside a bounded grid
bool Contains(bigint& t, bigint& l, bigint& b, bigint& r);
// return true if the selection encloses the given rectangle
bool Outside(bigint& t, bigint& l, bigint& b, bigint& r);
// return true if the selection is completely outside the given rectangle
bool ContainsCell(int x, int y);
// return true if the given cell is within the selection
void Advance();
// advance the pattern inside the selection by one generation
void AdvanceOutside();
// advance the pattern outside the selection by one generation
void Modify(const int x, const int y,
bigint& anchorx, bigint& anchory,
bool* forceh, bool* forcev);
// modify the existing selection based on where the user tapped (inside)
void Move(const bigint& xcells, const bigint& ycells);
// move the selection by the given number of cells
void SetLeftRight(const bigint& x, const bigint& anchorx);
// set the selection's left and right edges
void SetTopBottom(const bigint& y, const bigint& anchory);
// set the selection's top and bottom edges
void Fit();
// fit the selection inside the current viewport
void Shrink(bool fit);
// shrink the selection so it just encloses all the live cells
// and optionally fit the new selection inside the current viewport
bool Visible(gRect* visrect);
// return true if the selection is visible in the current viewport
// and, if visrect is not NULL, set it to the visible rectangle
void Clear();
// kill all cells inside the selection
void ClearOutside();
// kill all cells outside the selection
void CopyToClipboard(bool cut);
// copy the selection to the clipboard (using RLE format) and
// optionally clear the selection if cut is true
bool CanPaste(const bigint& wd, const bigint& ht, bigint& top, bigint& left);
// return true if the selection fits inside a rectangle of size ht x wd;
// if so then top and left are set to the selection's top left corner
void RandomFill();
// randomly fill the selection
bool Flip(bool topbottom, bool inundoredo);
// return true if selection was successfully flipped
bool Rotate(bool clockwise, bool inundoredo);
// return true if selection was successfully rotated
private:
bool SaveOutside(bigint& t, bigint& l, bigint& b, bigint& r);
// remember live cells outside the selection
void EmptyUniverse();
// kill all cells by creating a new, empty universe
void AddRun(int state, int multistate, unsigned int &run,
unsigned int &linelen, char* &chptr);
void AddEOL(char* &chptr);
// these routines are used by CopyToClipboard to create RLE data
bool SaveDifferences(lifealgo* oldalgo, lifealgo* newalgo,
int itop, int ileft, int ibottom, int iright);
// compare same rectangle in the given universes and remember the differences
// in cell states; return false only if user aborts lengthy comparison
bool FlipRect(bool topbottom, lifealgo* srcalgo, lifealgo* destalgo, bool erasesrc,
int top, int left, int bottom, int right);
// called by Flip to flip given rectangle from source universe to
// destination universe and optionally kill cells in the source rectangle;
// return false only if user aborts lengthy flip
bool RotateRect(bool clockwise, lifealgo* srcalgo, lifealgo* destalgo, bool erasesrc,
int itop, int ileft, int ibottom, int iright,
int ntop, int nleft, int nbottom, int nright);
// called by Rotate to rotate given rectangle from source universe to
// destination universe and optionally kill cells in the source rectangle;
// return false only if user aborts lengthy rotation
bool RotatePattern(bool clockwise,
bigint& newtop, bigint& newbottom,
bigint& newleft, bigint& newright,
bool inundoredo);
// called by Rotate when the selection encloses the entire pattern;
// return false only if user aborts lengthy rotation
bigint seltop, selleft, selbottom, selright;
// currently we only support a single rectangular selection
// which is represented by these edges; eventually we might
// support arbitrarily complex selection shapes by maintaining
// a list or dynamic array of non-overlapping rectangles
bool exists; // does the selection exist?
};
#endif
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