389ff92cc1
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503 lines
11 KiB
C
503 lines
11 KiB
C
/*
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u8g2_circle.c
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Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
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Copyright (c) 2016, olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "u8g2.h"
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/*==============================================*/
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/* Circle */
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static void u8g2_draw_circle_section(
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u8g2_t* u8g2,
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u8g2_uint_t x,
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u8g2_uint_t y,
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u8g2_uint_t x0,
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u8g2_uint_t y0,
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uint8_t option) U8G2_NOINLINE;
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static void u8g2_draw_circle_section(
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u8g2_t* u8g2,
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u8g2_uint_t x,
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u8g2_uint_t y,
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u8g2_uint_t x0,
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u8g2_uint_t y0,
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uint8_t option) {
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/* upper right */
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if(option & U8G2_DRAW_UPPER_RIGHT) {
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u8g2_DrawPixel(u8g2, x0 + x, y0 - y);
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u8g2_DrawPixel(u8g2, x0 + y, y0 - x);
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}
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/* upper left */
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if(option & U8G2_DRAW_UPPER_LEFT) {
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u8g2_DrawPixel(u8g2, x0 - x, y0 - y);
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u8g2_DrawPixel(u8g2, x0 - y, y0 - x);
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}
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/* lower right */
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if(option & U8G2_DRAW_LOWER_RIGHT) {
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u8g2_DrawPixel(u8g2, x0 + x, y0 + y);
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u8g2_DrawPixel(u8g2, x0 + y, y0 + x);
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}
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/* lower left */
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if(option & U8G2_DRAW_LOWER_LEFT) {
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u8g2_DrawPixel(u8g2, x0 - x, y0 + y);
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u8g2_DrawPixel(u8g2, x0 - y, y0 + x);
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}
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}
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static void
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u8g2_draw_circle(u8g2_t* u8g2, u8g2_uint_t x0, u8g2_uint_t y0, u8g2_uint_t rad, uint8_t option) {
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u8g2_int_t f;
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u8g2_int_t ddF_x;
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u8g2_int_t ddF_y;
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u8g2_uint_t x;
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u8g2_uint_t y;
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f = 1;
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f -= rad;
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ddF_x = 1;
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ddF_y = 0;
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ddF_y -= rad;
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ddF_y *= 2;
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x = 0;
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y = rad;
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u8g2_draw_circle_section(u8g2, x, y, x0, y0, option);
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while(x < y) {
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if(f >= 0) {
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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u8g2_draw_circle_section(u8g2, x, y, x0, y0, option);
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}
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}
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void u8g2_DrawCircle(u8g2_t* u8g2, u8g2_uint_t x0, u8g2_uint_t y0, u8g2_uint_t rad, uint8_t option) {
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/* check for bounding box */
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#ifdef U8G2_WITH_INTERSECTION
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{
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if(u8g2_IsIntersection(u8g2, x0 - rad, y0 - rad, x0 + rad + 1, y0 + rad + 1) == 0) return;
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}
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#endif /* U8G2_WITH_INTERSECTION */
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/* draw circle */
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u8g2_draw_circle(u8g2, x0, y0, rad, option);
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}
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/*==============================================*/
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/* Disk */
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static void u8g2_draw_disc_section(
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u8g2_t* u8g2,
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u8g2_uint_t x,
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u8g2_uint_t y,
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u8g2_uint_t x0,
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u8g2_uint_t y0,
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uint8_t option) U8G2_NOINLINE;
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static void u8g2_draw_disc_section(
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u8g2_t* u8g2,
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u8g2_uint_t x,
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u8g2_uint_t y,
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u8g2_uint_t x0,
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u8g2_uint_t y0,
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uint8_t option) {
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/* upper right */
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if(option & U8G2_DRAW_UPPER_RIGHT) {
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u8g2_DrawVLine(u8g2, x0 + x, y0 - y, y + 1);
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u8g2_DrawVLine(u8g2, x0 + y, y0 - x, x + 1);
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}
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/* upper left */
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if(option & U8G2_DRAW_UPPER_LEFT) {
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u8g2_DrawVLine(u8g2, x0 - x, y0 - y, y + 1);
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u8g2_DrawVLine(u8g2, x0 - y, y0 - x, x + 1);
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}
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/* lower right */
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if(option & U8G2_DRAW_LOWER_RIGHT) {
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u8g2_DrawVLine(u8g2, x0 + x, y0, y + 1);
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u8g2_DrawVLine(u8g2, x0 + y, y0, x + 1);
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}
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/* lower left */
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if(option & U8G2_DRAW_LOWER_LEFT) {
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u8g2_DrawVLine(u8g2, x0 - x, y0, y + 1);
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u8g2_DrawVLine(u8g2, x0 - y, y0, x + 1);
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}
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}
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static void
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u8g2_draw_disc(u8g2_t* u8g2, u8g2_uint_t x0, u8g2_uint_t y0, u8g2_uint_t rad, uint8_t option) {
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u8g2_int_t f;
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u8g2_int_t ddF_x;
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u8g2_int_t ddF_y;
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u8g2_uint_t x;
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u8g2_uint_t y;
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f = 1;
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f -= rad;
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ddF_x = 1;
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ddF_y = 0;
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ddF_y -= rad;
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ddF_y *= 2;
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x = 0;
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y = rad;
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u8g2_draw_disc_section(u8g2, x, y, x0, y0, option);
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while(x < y) {
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if(f >= 0) {
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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u8g2_draw_disc_section(u8g2, x, y, x0, y0, option);
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}
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}
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void u8g2_DrawDisc(u8g2_t* u8g2, u8g2_uint_t x0, u8g2_uint_t y0, u8g2_uint_t rad, uint8_t option) {
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/* check for bounding box */
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#ifdef U8G2_WITH_INTERSECTION
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{
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if(u8g2_IsIntersection(u8g2, x0 - rad, y0 - rad, x0 + rad + 1, y0 + rad + 1) == 0) return;
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}
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#endif /* U8G2_WITH_INTERSECTION */
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/* draw disc */
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u8g2_draw_disc(u8g2, x0, y0, rad, option);
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}
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/*==============================================*/
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/* Ellipse */
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/*
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Source:
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Foley, Computer Graphics, p 90
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*/
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static void u8g2_draw_ellipse_section(
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u8g2_t* u8g2,
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u8g2_uint_t x,
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u8g2_uint_t y,
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u8g2_uint_t x0,
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u8g2_uint_t y0,
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uint8_t option) U8G2_NOINLINE;
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static void u8g2_draw_ellipse_section(
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u8g2_t* u8g2,
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u8g2_uint_t x,
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u8g2_uint_t y,
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u8g2_uint_t x0,
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u8g2_uint_t y0,
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uint8_t option) {
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/* upper right */
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if(option & U8G2_DRAW_UPPER_RIGHT) {
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u8g2_DrawPixel(u8g2, x0 + x, y0 - y);
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}
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/* upper left */
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if(option & U8G2_DRAW_UPPER_LEFT) {
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u8g2_DrawPixel(u8g2, x0 - x, y0 - y);
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}
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/* lower right */
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if(option & U8G2_DRAW_LOWER_RIGHT) {
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u8g2_DrawPixel(u8g2, x0 + x, y0 + y);
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}
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/* lower left */
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if(option & U8G2_DRAW_LOWER_LEFT) {
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u8g2_DrawPixel(u8g2, x0 - x, y0 + y);
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}
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}
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static void u8g2_draw_ellipse(
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u8g2_t* u8g2,
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u8g2_uint_t x0,
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u8g2_uint_t y0,
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u8g2_uint_t rx,
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u8g2_uint_t ry,
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uint8_t option) {
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u8g2_uint_t x, y;
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u8g2_long_t xchg, ychg;
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u8g2_long_t err;
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u8g2_long_t rxrx2;
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u8g2_long_t ryry2;
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u8g2_long_t stopx, stopy;
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rxrx2 = rx;
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rxrx2 *= rx;
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rxrx2 *= 2;
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ryry2 = ry;
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ryry2 *= ry;
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ryry2 *= 2;
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x = rx;
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y = 0;
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xchg = 1;
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xchg -= rx;
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xchg -= rx;
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xchg *= ry;
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xchg *= ry;
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ychg = rx;
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ychg *= rx;
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err = 0;
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stopx = ryry2;
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stopx *= rx;
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stopy = 0;
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while(stopx >= stopy) {
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u8g2_draw_ellipse_section(u8g2, x, y, x0, y0, option);
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y++;
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stopy += rxrx2;
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err += ychg;
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ychg += rxrx2;
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if(2 * err + xchg > 0) {
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x--;
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stopx -= ryry2;
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err += xchg;
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xchg += ryry2;
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}
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}
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x = 0;
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y = ry;
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xchg = ry;
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xchg *= ry;
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ychg = 1;
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ychg -= ry;
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ychg -= ry;
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ychg *= rx;
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ychg *= rx;
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err = 0;
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stopx = 0;
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stopy = rxrx2;
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stopy *= ry;
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while(stopx <= stopy) {
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u8g2_draw_ellipse_section(u8g2, x, y, x0, y0, option);
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x++;
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stopx += ryry2;
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err += xchg;
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xchg += ryry2;
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if(2 * err + ychg > 0) {
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y--;
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stopy -= rxrx2;
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err += ychg;
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ychg += rxrx2;
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}
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}
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}
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void u8g2_DrawEllipse(
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u8g2_t* u8g2,
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u8g2_uint_t x0,
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u8g2_uint_t y0,
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u8g2_uint_t rx,
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u8g2_uint_t ry,
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uint8_t option) {
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/* check for bounding box */
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#ifdef U8G2_WITH_INTERSECTION
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{
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if(u8g2_IsIntersection(u8g2, x0 - rx, y0 - ry, x0 + rx + 1, y0 + ry + 1) == 0) return;
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}
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#endif /* U8G2_WITH_INTERSECTION */
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u8g2_draw_ellipse(u8g2, x0, y0, rx, ry, option);
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}
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/*==============================================*/
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/* Filled Ellipse */
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static void u8g2_draw_filled_ellipse_section(
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u8g2_t* u8g2,
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u8g2_uint_t x,
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u8g2_uint_t y,
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u8g2_uint_t x0,
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u8g2_uint_t y0,
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uint8_t option) U8G2_NOINLINE;
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static void u8g2_draw_filled_ellipse_section(
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u8g2_t* u8g2,
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u8g2_uint_t x,
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u8g2_uint_t y,
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u8g2_uint_t x0,
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u8g2_uint_t y0,
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uint8_t option) {
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/* upper right */
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if(option & U8G2_DRAW_UPPER_RIGHT) {
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u8g2_DrawVLine(u8g2, x0 + x, y0 - y, y + 1);
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}
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/* upper left */
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if(option & U8G2_DRAW_UPPER_LEFT) {
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u8g2_DrawVLine(u8g2, x0 - x, y0 - y, y + 1);
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}
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/* lower right */
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if(option & U8G2_DRAW_LOWER_RIGHT) {
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u8g2_DrawVLine(u8g2, x0 + x, y0, y + 1);
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}
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/* lower left */
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if(option & U8G2_DRAW_LOWER_LEFT) {
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u8g2_DrawVLine(u8g2, x0 - x, y0, y + 1);
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}
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}
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static void u8g2_draw_filled_ellipse(
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u8g2_t* u8g2,
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u8g2_uint_t x0,
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u8g2_uint_t y0,
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u8g2_uint_t rx,
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u8g2_uint_t ry,
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uint8_t option) {
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u8g2_uint_t x, y;
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u8g2_long_t xchg, ychg;
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u8g2_long_t err;
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u8g2_long_t rxrx2;
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u8g2_long_t ryry2;
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u8g2_long_t stopx, stopy;
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rxrx2 = rx;
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rxrx2 *= rx;
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rxrx2 *= 2;
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ryry2 = ry;
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ryry2 *= ry;
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ryry2 *= 2;
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x = rx;
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y = 0;
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xchg = 1;
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xchg -= rx;
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xchg -= rx;
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xchg *= ry;
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xchg *= ry;
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ychg = rx;
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ychg *= rx;
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err = 0;
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stopx = ryry2;
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stopx *= rx;
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stopy = 0;
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while(stopx >= stopy) {
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u8g2_draw_filled_ellipse_section(u8g2, x, y, x0, y0, option);
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y++;
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stopy += rxrx2;
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err += ychg;
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ychg += rxrx2;
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if(2 * err + xchg > 0) {
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x--;
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stopx -= ryry2;
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err += xchg;
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xchg += ryry2;
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}
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}
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x = 0;
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y = ry;
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xchg = ry;
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xchg *= ry;
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ychg = 1;
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ychg -= ry;
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ychg -= ry;
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ychg *= rx;
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ychg *= rx;
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err = 0;
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stopx = 0;
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stopy = rxrx2;
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stopy *= ry;
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while(stopx <= stopy) {
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u8g2_draw_filled_ellipse_section(u8g2, x, y, x0, y0, option);
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x++;
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stopx += ryry2;
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err += xchg;
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xchg += ryry2;
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if(2 * err + ychg > 0) {
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y--;
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stopy -= rxrx2;
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err += ychg;
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ychg += rxrx2;
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}
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}
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}
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void u8g2_DrawFilledEllipse(
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u8g2_t* u8g2,
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u8g2_uint_t x0,
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u8g2_uint_t y0,
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u8g2_uint_t rx,
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u8g2_uint_t ry,
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uint8_t option) {
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/* check for bounding box */
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#ifdef U8G2_WITH_INTERSECTION
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{
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if(u8g2_IsIntersection(u8g2, x0 - rx, y0 - ry, x0 + rx + 1, y0 + ry + 1) == 0) return;
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}
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#endif /* U8G2_WITH_INTERSECTION */
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u8g2_draw_filled_ellipse(u8g2, x0, y0, rx, ry, option);
|
|
}
|