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-rw-r--r--src/graph.c216
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diff --git a/src/graph.c b/src/graph.c
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-/*
- ChibiOS/GFX - Copyright (C) 2012
- Joel Bodenmann aka Tectu <joel@unormal.org>
-
- This file is part of ChibiOS/GFX.
-
- ChibiOS/GFX is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- ChibiOS/GFX is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-/**
- * @file src/graph.c
- * @brief GRAPH module code.
- *
- * @addtogroup GRAPH
- * @{
- */
-#include <stdlib.h>
-#include "ch.h"
-#include "hal.h"
-#include "gdisp.h"
-#include "graph.h"
-
-#if GFX_USE_GRAPH || defined(__DOXYGEN__)
-
-static void _horizontalDotLine(coord_t x0, coord_t y0, coord_t x1, uint16_t space, color_t color) {
- uint16_t offset = x0;
- uint16_t count = ((x1 - x0) / space);
-
- do {
- gdispDrawPixel(offset, y0, color);
- offset += space;
- } while(count--);
-}
-
-static void _verticalDotLine(coord_t x0, coord_t y0, coord_t y1, uint16_t space, color_t color) {
- uint16_t offset = y0;
- uint16_t count = ((y1 - y0) / space);
-
- do {
- gdispDrawPixel(x0, offset, color);
- offset += space;
- } while(count--);
-}
-
-/**
- * @brief Draws a graph system
- * @details Draws a graph system with two axis, X and Y.
- * Different optinal parameters like grid size, grid color,
- * arrow color (if any) etc. are defined in the struct.
- *
- * @param[in] g A pointer to a Graph struct
- *
- * @init
- */
-void graphDrawSystem(Graph *g) {
- uint16_t i;
-
- g->x0 = g->origin_x - abs(g->xmin);
- g->x1 = g->origin_x + abs(g->xmax);
- g->y0 = g->origin_y + abs(g->ymin);
- g->y1 = g->origin_y - abs(g->ymax);
-
- /* X - Axis */
- if(g->full_grid) {
- for(i = 1; i <= ((g->origin_y - g->y1) / g->grid_size); i++) {
- _horizontalDotLine(g->x0, g->origin_y - g->grid_size * i, g->x1, g->dot_space, g->grid_color);
- }
- for(i = 1; i <= ((g->y0 - g->origin_y) / g->grid_size); i++) {
- _horizontalDotLine(g->x0, g->origin_y + g->grid_size * i, g->x1, g->dot_space, g->grid_color);
- }
- }
- gdispDrawLine(g->x0, g->origin_y, g->x1, g->origin_y, g->axis_color);
- if(g->arrows) {
- gdispDrawLine(g->x1, g->origin_y, g->x1-5, g->origin_y+5, g->axis_color);
- gdispDrawLine(g->x1, g->origin_y, g->x1-5, g->origin_y-5, g->axis_color);
- }
-
- /* Y - Axis */
- if(g->full_grid) {
- for(i = 1; i <= ((g->origin_x - g->x0) / g->grid_size); i++) {
- _verticalDotLine(g->origin_x - g->grid_size * i, g->y1, g->y0, g->dot_space, g->grid_color);
- }
- for(i = 1; i <= ((g->x1 - g->origin_x) / g->grid_size); i++) {
- _verticalDotLine(g->origin_x + g->grid_size * i, g->y1, g->y0, g->dot_space, g->grid_color);
- }
- }
- gdispDrawLine(g->origin_x, g->y0, g->origin_x, g->y1, g->axis_color);
- if(g->arrows) {
- gdispDrawLine(g->origin_x, g->y1, g->origin_x-5, g->y1+5, g->axis_color);
- gdispDrawLine(g->origin_x, g->y1, g->origin_x+5, g->y1+5, g->axis_color);
- }
-}
-
-/**
- * @brief Checks if x and y are inside the graph area
- *
- * @param[in] g The pointer to the graph
- * @param[in] x,y The coordinates to be checked
- *
- * @return 1 if outside the graph area, 0 otherwise
- *
- * @notapi
- */
-static bool_t _boundaryCheck(Graph *g, coord_t x, coord_t y) {
- if(g->origin_x + x > g->x1)
- return 1;
- if(g->origin_x + x < g->x0)
- return 1;
- if(g->origin_y - y < g->y1)
- return 1;
- if(g->origin_y - y > g->y0)
- return 1;
-
- return 0;
-}
-
-/**
- * @brief Draws a single dot into the graph
- * @note The dot won't be drawn if it's outsite the max and min
- * values of the graph.
- *
- * @param[in] g The pointer to the graph
- * @param[in] x,y The coordinates where the data point will be drawn
- * @param[in] radius The radius of the dot. One pixel if 0.
- * @param[in] color The color of the dot.
- *
- * @api
- */
-void graphDrawDot(Graph *g, coord_t x, coord_t y, uint16_t radius, color_t color) {
- if(_boundaryCheck(g, x, y))
- return;
-
- if(radius == 0)
- gdispDrawPixel(g->origin_x + x, g->origin_y - y, color);
- else
- gdispFillCircle(g->origin_x + x, g->origin_y - y, radius, color);
-}
-
-/**
- * @brief Draws multiple dots into the graph
- * @note A dot won't be drawn if it's outsite the max and min
- * values of the graph.
- *
- * @param[in] g The pointer to the graph
- * @param[in] coord A two dimensional int array containing the dots coordinates.
- * @param[in] entries How many dots will be drawn (array index from 0 to entries);
- * @param[in] radius The radius of the dots. One pixel if 0.
- * @param[in] color The color of the dots.
- *
- * @api
- */
-void graphDrawDots(Graph *g, int coord[][2], uint16_t entries, uint16_t radius, uint16_t color) {
- uint16_t i;
-
- for(i = 0; i < entries; i++) {
- if(_boundaryCheck(g, coord[i][0], coord[i][1]))
- continue;
-
- if(radius == 0)
- gdispDrawPixel(coord[i][0] + g->origin_x, g->origin_y - coord[i][1], color);
- else
- gdispFillCircle(coord[i][0] + g->origin_x, g->origin_y - coord[i][1], radius, color);
- }
-}
-
-/**
- * @brief Draws multiple dots into the graph and connects them by a line
- * @note A dot won't be drawn if it's outsite the max and min
- * values of the graph.
- *
- * @param[in] g The pointer to the graph
- * @param[in] coord A two dimensional int array containing the dots coordinates.
- * @param[in] entries How many dots will be drawn (array index from 0 to entries);
- * @param[in] radius The radius of the dots. One pixel if 0.
- * @param[in] lineColor The color of the line.
- * @param[in] dotColor The color of the dots.
- *
- * @api
- */
-void graphDrawNet(Graph *g, int coord[][2], uint16_t entries, uint16_t radius, uint16_t lineColor, uint16_t dotColor) {
- uint16_t i;
-
- /* draw lines */
- for(i = 0; i < entries-1; i++) {
- if(_boundaryCheck(g, coord[i][0], coord[i][1]))
- continue;
-
- gdispDrawLine(coord[i][0] + g->origin_x, g->origin_y - coord[i][1], coord[i+1][0] + g->origin_x, g->origin_y - coord[i+1][1], lineColor);
- }
-
- /* draw dots */
- for(i = 0; i < entries; i++) {
- if(_boundaryCheck(g, coord[i][0], coord[i][1]))
- continue;
-
- if(radius == 0)
- gdispDrawPixel(coord[i][0] + g->origin_x, g->origin_y - coord[i][1], dotColor);
- else
- gdispFillCircle(coord[i][0] + g->origin_x, g->origin_y - coord[i][1], radius, dotColor);
- }
-}
-
-#endif /* GFX_USE_GRAPH */
-/** @} */
-
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