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432 lines
12 KiB
C++
432 lines
12 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "common/algorithm.h"
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#include "common/util.h"
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#include "graphics/primitives.h"
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namespace Graphics {
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void drawLine(int x0, int y0, int x1, int y1, int color, void (*plotProc)(int, int, int, void *), void *data) {
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// Bresenham's line algorithm, as described by Wikipedia
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const bool steep = ABS(y1 - y0) > ABS(x1 - x0);
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if (steep) {
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SWAP(x0, y0);
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SWAP(x1, y1);
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}
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const int delta_x = ABS(x1 - x0);
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const int delta_y = ABS(y1 - y0);
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const int delta_err = delta_y;
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int x = x0;
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int y = y0;
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int err = 0;
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const int x_step = (x0 < x1) ? 1 : -1;
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const int y_step = (y0 < y1) ? 1 : -1;
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if (steep)
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(*plotProc)(y, x, color, data);
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else
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(*plotProc)(x, y, color, data);
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while (x != x1) {
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x += x_step;
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err += delta_err;
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if (2 * err > delta_x) {
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y += y_step;
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err -= delta_x;
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}
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if (steep)
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(*plotProc)(y, x, color, data);
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else
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(*plotProc)(x, y, color, data);
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}
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}
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void drawHLine(int x1, int x2, int y, int color, void (*plotProc)(int, int, int, void *), void *data) {
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if (x1 > x2)
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SWAP(x1, x2);
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for (int x = x1; x <= x2; x++)
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(*plotProc)(x, y, color, data);
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}
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void drawVLine(int x, int y1, int y2, int color, void (*plotProc)(int, int, int, void *), void *data) {
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if (y1 > y2)
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SWAP(y1, y2);
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for (int y = y1; y <= y2; y++)
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(*plotProc)(x, y, color, data);
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}
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void drawThickLine(int x0, int y0, int x1, int y1, int penX, int penY, int color, void (*plotProc)(int, int, int, void *), void *data) {
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assert(penX > 0 && penY > 0);
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// Shortcut
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if (penX == 1 && penY == 1) {
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drawLine(x0, y0, x1, y1, color, plotProc, data);
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return;
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}
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// TODO: Optimize this. It currently is a very naive way of handling
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// thick lines since quite often it will be drawing to the same pixel
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// multiple times.
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for (int x = 0; x < penX; x++)
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for (int y = 0; y < penY; y++)
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drawLine(x0 + x, y0 + y, x1 + x, y1 + y, color, plotProc, data);
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}
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/* Bresenham as presented in Foley & Van Dam */
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/* Code is based on GD lib http://libgd.github.io/ */
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void drawThickLine2(int x1, int y1, int x2, int y2, int thick, int color, void (*plotProc)(int, int, int, void *), void *data) {
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int incr1, incr2, d, x, y, xend, yend, xdirflag, ydirflag;
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int wid;
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int w, wstart;
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int dx = abs(x2 - x1);
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int dy = abs(y2 - y1);
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if (dx == 0) {
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int xn = x1 - thick / 2;
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Common::Rect r(xn, MIN(y1, y2), xn + thick - 1, MAX(y1, y2));
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drawFilledRect(r, color, plotProc, data);
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return;
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} else if (dy == 0) {
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int yn = y1 - thick / 2;
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Common::Rect r(MIN(x1, x2), yn, MAX(x1, x2), yn + thick - 1);
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drawFilledRect(r, color, plotProc, data);
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return;
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}
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if (dy <= dx) {
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/* More-or-less horizontal. use wid for vertical stroke */
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/* 2.0.12: Michael Schwartz: divide rather than multiply;
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TBB: but watch out for /0! */
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if (dx != 0 && thick != 0) {
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double ac_recip = 1.0/dx * sqrt((double)(dx * dx + dy * dy)); // 1 / cos(atan2((double)dy, (double)dx));
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wid = thick * ac_recip;
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} else {
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wid = 1;
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}
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d = 2 * dy - dx;
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incr1 = 2 * dy;
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incr2 = 2 * (dy - dx);
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if (x1 > x2) {
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x = x2;
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y = y2;
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ydirflag = (-1);
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xend = x1;
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} else {
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x = x1;
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y = y1;
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ydirflag = 1;
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xend = x2;
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}
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/* Set up line thickness */
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wstart = y - wid / 2;
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for (w = wstart; w < wstart + wid; w++)
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(*plotProc)(x, y, color, data);
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if (((y2 - y1) * ydirflag) > 0) {
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while (x < xend) {
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x++;
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if (d < 0) {
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d += incr1;
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} else {
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y++;
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d += incr2;
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}
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wstart = y - wid / 2;
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for (w = wstart; w < wstart + wid; w++)
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(*plotProc)(x, w, color, data);
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}
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} else {
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while (x < xend) {
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x++;
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if (d < 0) {
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d += incr1;
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} else {
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y--;
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d += incr2;
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}
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wstart = y - wid / 2;
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for (w = wstart; w < wstart + wid; w++)
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(*plotProc)(x, w, color, data);
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}
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}
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} else {
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/* More-or-less vertical. use wid for horizontal stroke */
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/* 2.0.12: Michael Schwartz: divide rather than multiply;
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TBB: but watch out for /0! */
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if (dy != 0 && thick != 0) {
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double as_recip = 1.0/dy * sqrt((double)(dx * dx + dy * dy)); // 1 / sin(atan2((double)dy, (double)dx));
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wid = thick * as_recip;
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} else {
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wid = 1;
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}
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d = 2 * dx - dy;
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incr1 = 2 * dx;
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incr2 = 2 * (dx - dy);
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if (y1 > y2) {
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y = y2;
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x = x2;
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yend = y1;
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xdirflag = (-1);
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} else {
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y = y1;
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x = x1;
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yend = y2;
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xdirflag = 1;
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}
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/* Set up line thickness */
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wstart = x - wid / 2;
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for (w = wstart; w < wstart + wid; w++)
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(*plotProc)(w, y, color, data);
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if (((x2 - x1) * xdirflag) > 0) {
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while (y < yend) {
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y++;
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if (d < 0) {
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d += incr1;
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} else {
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x++;
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d += incr2;
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}
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wstart = x - wid / 2;
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for (w = wstart; w < wstart + wid; w++)
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(*plotProc)(w, y, color, data);
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}
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} else {
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while (y < yend) {
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y++;
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if (d < 0) {
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d += incr1;
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} else {
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x--;
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d += incr2;
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}
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wstart = x - wid / 2;
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for (w = wstart; w < wstart + wid; w++)
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(*plotProc)(w, y, color, data);
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}
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}
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}
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}
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void drawFilledRect(Common::Rect &rect, int color, void (*plotProc)(int, int, int, void *), void *data) {
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for (int y = rect.top; y <= rect.bottom; y++)
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drawHLine(rect.left, rect.right, y, color, plotProc, data);
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}
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void drawRect(Common::Rect &rect, int color, void (*plotProc)(int, int, int, void *), void *data) {
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drawHLine(rect.left, rect.right, rect.top, color, plotProc, data);
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drawHLine(rect.left, rect.right, rect.bottom, color, plotProc, data);
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drawVLine(rect.left, rect.top, rect.bottom, color, plotProc, data);
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drawVLine(rect.right, rect.top, rect.bottom, color, plotProc, data);
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}
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// http://members.chello.at/easyfilter/bresenham.html
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void drawRoundRect(Common::Rect &rect, int arc, int color, bool filled, void (*plotProc)(int, int, int, void *), void *data) {
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if (rect.height() < rect.width()) {
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int x = -arc, y = 0, err = 2-2*arc; /* II. Quadrant */
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int dy = rect.height() - arc * 2;
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int r = arc;
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int stop = 0;
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int lastx = 0, lasty = 0;
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if (dy < 0)
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stop = -dy / 2;
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do {
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if (filled) {
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drawHLine(rect.left + x + r, rect.right - x - r, rect.top - y + r - stop, color, plotProc, data);
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drawHLine(rect.left + x + r, rect.right - x - r, rect.bottom + y - r + stop, color, plotProc, data);
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} else {
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(*plotProc)(rect.left + x + r, rect.top - y + r - stop, color, data);
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(*plotProc)(rect.right - x - r, rect.top - y + r - stop, color, data);
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(*plotProc)(rect.left + x + r, rect.bottom + y - r + stop, color, data);
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(*plotProc)(rect.right - x - r, rect.bottom + y - r + stop, color, data);
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lastx = x;
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lasty = y;
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}
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arc = err;
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if (arc <= y) err += ++y*2+1; /* e_xy+e_y < 0 */
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if (arc > x || err > y) err += ++x*2+1; /* e_xy+e_x > 0 or no 2nd y-step */
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if (stop && y > stop)
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break;
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} while (x < 0);
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if (!filled) {
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x = lastx;
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y = lasty;
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drawHLine(rect.left + x + r, rect.right - x - r, rect.top - y + r - stop, color, plotProc, data);
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drawHLine(rect.left + x + r, rect.right - x - r, rect.bottom + y - r + stop, color, plotProc, data);
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}
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for (int i = 1; i < dy; i++) {
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if (filled) {
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drawHLine(rect.left, rect.right, rect.top + r + i, color, plotProc, data);
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} else {
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(*plotProc)(rect.left, rect.top + r + i, color, data);
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(*plotProc)(rect.right, rect.top + r + i, color, data);
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}
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}
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} else {
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int y = -arc, x = 0, err = 2-2*arc; /* II. Quadrant */
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int dx = rect.width() - arc * 2;
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int r = arc;
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int stop = 0;
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int lastx = 0, lasty = 0;
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if (dx < 0)
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stop = -dx / 2;
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do {
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if (filled) {
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drawVLine(rect.left - x + r - stop, rect.top + y + r, rect.bottom - y - r, color, plotProc, data);
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drawVLine(rect.right + x - r + stop, rect.top + y + r, rect.bottom - y - r, color, plotProc, data);
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} else {
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(*plotProc)(rect.left - x + r - stop, rect.top + y + r, color, data);
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(*plotProc)(rect.left - x + r - stop, rect.bottom - y - r, color, data);
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(*plotProc)(rect.right + x - r + stop, rect.top + y + r, color, data);
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(*plotProc)(rect.right + x - r + stop, rect.bottom - y - r, color, data);
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lastx = x;
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lasty = y;
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}
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arc = err;
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if (arc <= x) err += ++x*2+1; /* e_xy+e_y < 0 */
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if (arc > y || err > x) err += ++y*2+1; /* e_xy+e_x > 0 or no 2nd y-step */
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if (stop && x > stop)
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break;
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} while (y < 0);
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if (!filled) {
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x = lastx;
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y = lasty;
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drawVLine(rect.left - x + r - stop, rect.top + y + r, rect.bottom - y - r, color, plotProc, data);
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drawVLine(rect.right + x - r + stop, rect.top + y + r, rect.bottom - y - r, color, plotProc, data);
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}
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for (int i = 1; i < dx; i++) {
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if (filled) {
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drawVLine(rect.left + r + i, rect.top, rect.bottom, color, plotProc, data);
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} else {
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(*plotProc)(rect.left + r + i, rect.top, color, data);
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(*plotProc)(rect.left + r + i, rect.bottom, color, data);
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}
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}
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}
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}
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// Based on public-domain code by Darel Rex Finley, 2007
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// http://alienryderflex.com/polygon_fill/
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void drawPolygonScan(int *polyX, int *polyY, int npoints, Common::Rect &bbox, int color, void (*plotProc)(int, int, int, void *), void *data) {
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int *nodeX = (int *)calloc(npoints, sizeof(int));
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int i, j;
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// Loop through the rows of the image.
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for (int pixelY = bbox.top; pixelY < bbox.bottom; pixelY++) {
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// Build a list of nodes.
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int nodes = 0;
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j = npoints - 1;
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for (i = 0; i < npoints; i++) {
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if ((polyY[i] < pixelY && polyY[j] >= pixelY) || (polyY[j] < pixelY && polyY[i] >= pixelY)) {
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nodeX[nodes++] = (int)(polyX[i] + (double)(pixelY - polyY[i]) / (double)(polyY[j]-polyY[i]) *
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(double)(polyX[j] - polyX[i]) + 0.5);
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}
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j = i;
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}
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// Sort the nodes
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Common::sort(nodeX, &nodeX[nodes]);
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// Fill the pixels between node pairs.
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for (i = 0; i < nodes; i += 2) {
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if (nodeX[i ] >= bbox.right)
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break;
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if (nodeX[i + 1] > bbox.left) {
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nodeX[i] = MAX<int16>(nodeX[i], bbox.left);
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nodeX[i + 1] = MIN<int16>(nodeX[i + 1], bbox.right);
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drawHLine(nodeX[i], nodeX[i + 1], pixelY, color, plotProc, data);
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}
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}
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}
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free(nodeX);
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}
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// http://members.chello.at/easyfilter/bresenham.html
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void drawEllipse(int x0, int y0, int x1, int y1, int color, bool filled, void (*plotProc)(int, int, int, void *), void *data) {
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int a = abs(x1 - x0), b = abs(y1 - y0), b1 = b & 1; /* values of diameter */
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long dx = 4 * (1 - a) * b * b, dy = 4 * (b1 + 1) * a * a; /* error increment */
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long err = dx + dy + b1 * a * a, e2; /* error of 1.step */
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if (x0 > x1) { x0 = x1; x1 += a; } /* if called with swapped points */
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if (y0 > y1) y0 = y1; /* .. exchange them */
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y0 += (b + 1) / 2; y1 = y0 - b1; /* starting pixel */
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a *= 8 * a; b1 = 8 * b * b;
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do {
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if (filled) {
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drawHLine(x0, x1, y0, color, plotProc, data);
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drawHLine(x0, x1, y1, color, plotProc, data);
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} else {
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(*plotProc)(x1, y0, color, data); /* I. Quadrant */
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(*plotProc)(x0, y0, color, data); /* II. Quadrant */
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(*plotProc)(x0, y1, color, data); /* III. Quadrant */
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(*plotProc)(x1, y1, color, data); /* IV. Quadrant */
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}
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e2 = 2*err;
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if (e2 <= dy) { y0++; y1--; err += dy += a; } /* y step */
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if (e2 >= dx || 2*err > dy) { x0++; x1--; err += dx += b1; } /* x step */
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} while (x0 <= x1);
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while (y0-y1 < b) { /* too early stop of flat ellipses a=1 */
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if (filled) {
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drawHLine(x0 - 1, x0 - 1, y0, color, plotProc, data); /* -> finish tip of ellipse */
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drawHLine(x1 + 1, x1 + 1, y0, color, plotProc, data);
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drawHLine(x0 - 1, x0 - 1, y1, color, plotProc, data);
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drawHLine(x1 + 1, x1 + 1, y1, color, plotProc, data);
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} else {
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(*plotProc)(x0 - 1, y0, color, data); /* -> finish tip of ellipse */
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(*plotProc)(x1 + 1, y0, color, data);
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(*plotProc)(x0 - 1, y1, color, data);
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(*plotProc)(x1 + 1, y1, color, data);
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}
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y0++;
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y1--;
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}
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}
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} // End of namespace Graphics
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