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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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