mirror of
https://github.com/Hopiu/rpi-rgb-led-matrix.git
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92 lines
3 KiB
C++
92 lines
3 KiB
C++
// -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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// Copyright (C) 2014 Henner Zeller <h.zeller@acm.org>
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation version 2.
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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, see <http://gnu.org/licenses/gpl-2.0.txt>
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#include "graphics.h"
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#include "utf8-internal.h"
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#include <stdlib.h>
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#include <functional>
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namespace rgb_matrix {
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int DrawText(Canvas *c, const Font &font,
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int x, int y, const Color &color,
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const char *utf8_text) {
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return DrawText(c, font, x, y, color, NULL, utf8_text);
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}
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int DrawText(Canvas *c, const Font &font,
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int x, int y, const Color &color, const Color *background_color,
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const char *utf8_text) {
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const int start_x = x;
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while (*utf8_text) {
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const uint32_t cp = utf8_next_codepoint(utf8_text);
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x += font.DrawGlyph(c, x, y, color, background_color, cp);
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}
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return x - start_x;
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}
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void DrawCircle(Canvas *c, int x0, int y0, int radius, const Color &color) {
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int x = radius, y = 0;
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int radiusError = 1 - x;
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while (y <= x) {
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c->SetPixel(x + x0, y + y0, color.r, color.g, color.b);
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c->SetPixel(y + x0, x + y0, color.r, color.g, color.b);
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c->SetPixel(-x + x0, y + y0, color.r, color.g, color.b);
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c->SetPixel(-y + x0, x + y0, color.r, color.g, color.b);
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c->SetPixel(-x + x0, -y + y0, color.r, color.g, color.b);
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c->SetPixel(-y + x0, -x + y0, color.r, color.g, color.b);
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c->SetPixel(x + x0, -y + y0, color.r, color.g, color.b);
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c->SetPixel(y + x0, -x + y0, color.r, color.g, color.b);
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y++;
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if (radiusError<0){
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radiusError += 2 * y + 1;
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} else {
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x--;
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radiusError+= 2 * (y - x + 1);
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}
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}
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}
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void DrawLine(Canvas *c, int x0, int y0, int x1, int y1, const Color &color) {
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int dy = y1 - y0, dx = x1 - x0, gradient, x, y, shift = 0x10;
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if (abs(dx) > abs(dy)) {
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// x variation is bigger than y variation
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if (x1 < x0) {
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std::swap(x0, x1);
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std::swap(y0, y1);
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}
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gradient = (dy << shift) / dx ;
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for (x = x0 , y = 0x8000 + (y0 << shift); x <= x1; ++x, y += gradient) {
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c->SetPixel(x, y >> shift, color.r, color.g, color.b);
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}
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} else if (dy != 0) {
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// y variation is bigger than x variation
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if (y1 < y0) {
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std::swap(x0, x1);
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std::swap(y0, y1);
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}
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gradient = (dx << shift) / dy;
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for (y = y0 , x = 0x8000 + (x0 << shift); y <= y1; ++y, x += gradient) {
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c->SetPixel(x >> shift, y, color.r, color.g, color.b);
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}
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} else {
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c->SetPixel(x0, y0, color.r, color.g, color.b);
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}
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}
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}//namespace
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