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Diffstat (limited to 'tesseract/src/ccstruct/polyblk.h')
-rw-r--r-- | tesseract/src/ccstruct/polyblk.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/tesseract/src/ccstruct/polyblk.h b/tesseract/src/ccstruct/polyblk.h new file mode 100644 index 00000000..3bbd37e4 --- /dev/null +++ b/tesseract/src/ccstruct/polyblk.h @@ -0,0 +1,116 @@ +/********************************************************************** + * File: polyblk.h (Formerly poly_block.h) + * Description: Polygonal blocks + * + * (C) Copyright 1993, Hewlett-Packard Ltd. + ** Licensed under the Apache License, Version 2.0 (the "License"); + ** you may not use this file except in compliance with the License. + ** You may obtain a copy of the License at + ** http://www.apache.org/licenses/LICENSE-2.0 + ** Unless required by applicable law or agreed to in writing, software + ** distributed under the License is distributed on an "AS IS" BASIS, + ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + ** See the License for the specific language governing permissions and + ** limitations under the License. + * + **********************************************************************/ + +#ifndef POLYBLK_H +#define POLYBLK_H + +#include "elst.h" +#include "points.h" +#include "rect.h" +#include "scrollview.h" + +#include <tesseract/publictypes.h> + +namespace tesseract { + +class TESS_API POLY_BLOCK { + public: + POLY_BLOCK() = default; + // Initialize from box coordinates. + POLY_BLOCK(const TBOX& tbox, PolyBlockType type); + POLY_BLOCK(ICOORDELT_LIST *points, PolyBlockType type); + ~POLY_BLOCK () = default; + + TBOX *bounding_box() { // access function + return &box; + } + + ICOORDELT_LIST *points() { // access function + return &vertices; + } + + void compute_bb(); + + PolyBlockType isA() const { + return type; + } + + bool IsText() const { + return PTIsTextType(type); + } + + // Rotate about the origin by the given rotation. (Analogous to + // multiplying by a complex number. + void rotate(FCOORD rotation); + // Reflect the coords of the polygon in the y-axis. (Flip the sign of x.) + void reflect_in_y_axis(); + // Move by adding shift to all coordinates. + void move(ICOORD shift); + + void plot(ScrollView* window, int32_t num); + + #ifndef GRAPHICS_DISABLED + void fill(ScrollView* window, ScrollView::Color colour); + #endif // !GRAPHICS_DISABLED + + // Returns true if other is inside this. + bool contains(POLY_BLOCK *other); + + // Returns true if the polygons of other and this overlap. + bool overlap(POLY_BLOCK *other); + + // Returns the winding number of this around the test_pt. + // Positive for anticlockwise, negative for clockwise, and zero for + // test_pt outside this. + int16_t winding_number(const ICOORD &test_pt); + + #ifndef GRAPHICS_DISABLED + // Static utility functions to handle the PolyBlockType. + // Returns a color to draw the given type. + static ScrollView::Color ColorForPolyBlockType(PolyBlockType type); + #endif // !GRAPHICS_DISABLED + + private: + ICOORDELT_LIST vertices; // vertices + TBOX box; // bounding box + PolyBlockType type; // Type of this region. +}; + +// Class to iterate the scanlines of a polygon. +class PB_LINE_IT { + public: + PB_LINE_IT(POLY_BLOCK *blkptr) { + block = blkptr; + } + + void set_to_block(POLY_BLOCK * blkptr) { + block = blkptr; + } + + // Returns a list of runs of pixels for the given y coord. + // Each element of the returned list is the start (x) and extent(y) of + // a run inside the region. + // Delete the returned list after use. + ICOORDELT_LIST *get_line(int16_t y); + + private: + POLY_BLOCK * block; +}; + +} // namespace tesseract + +#endif |