Accum-Tester/src/graph.c

/*
 * https://wiki.ugfx.io/index.php/Graph
 *
 * Copyright (c) 2012, 2013, Joel Bodenmann aka Tectu <joel@unormal.org>
 * Copyright (c) 2012, 2013, Andrew Hannam aka inmarket
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *    * Neither the name of the <organization> nor the
 *      names of its contributors may be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "gfx.h"
#include "math.h"

// window
#define WINDOW_X    1
#define WINDOW_Y    123
#define WINDOW_W    318
#define WINDOW_H    118

#define MIN_U       0
#define MIN_I       0
#define MAX_U       15000
#define MAX_I       5000

// from Arduino
static long map(long x, long in_min, long in_max, long out_min, long out_max) {
      return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

// A graph styling
static GGraphStyle GraphStyle1 = {
    { GGRAPH_POINT_DOT, 0, GFX_BLUE },          // Point
    { GGRAPH_LINE_NONE, 2, GFX_GRAY },          // Line
    { GGRAPH_LINE_SOLID, 0, GFX_WHITE },        // X axis
    { GGRAPH_LINE_SOLID, 0, GFX_WHITE },        // Y axis
    { GGRAPH_LINE_DASH, 5, GFX_GRAY, 50 },      // X grid
    { GGRAPH_LINE_DOT, 7, GFX_YELLOW, 50 },     // Y grid
    GWIN_GRAPH_STYLE_POSITIVE_AXIS_ARROWS		// Flags
};

static GHandle gh;
static gCoord pos_X;

void graph_Init(void) {
    // Create the graph window
    {
        GWindowInit wi;
 
        wi.show = gTrue;
        wi.x = WINDOW_X;
        wi.y = WINDOW_Y;
        wi.width = WINDOW_W;
        wi.height = WINDOW_H;
        gh = gwinGraphCreate(0, &wi);
    }

    // clear area
    gdispFillArea(WINDOW_X, WINDOW_Y, WINDOW_W, WINDOW_H, GFX_BLACK);

    // Set the graph origin and style
    gwinGraphSetOrigin(gh, gwinGetWidth(gh)/2, gwinGetHeight(gh)/2);
    gwinGraphSetStyle(gh, &GraphStyle1);
    gwinGraphDrawAxis(gh);

    pos_X = WINDOW_X;
}

void graph_Draw(uint32_t u_value, uint32_t i_value) {
    gCoord pos_Y;

    // Modify the style
    gwinGraphStartSet(gh);
    GraphStyle1.point.color = GFX_GREEN;
    gwinGraphSetStyle(gh, &GraphStyle1);

    // Draw voltage point
    pos_Y = map(u_value, MIN_U, MAX_U, WINDOW_Y, WINDOW_H);
    gwinGraphDrawPoint(gh, pos_X, pos_Y);

    // Modify the style
    gwinGraphStartSet(gh);
    GraphStyle1.point.color = GFX_RED;
    gwinGraphSetStyle(gh, &GraphStyle1);

    // Draw current point
    pos_Y = map(i_value, MIN_I, MAX_I, WINDOW_Y, WINDOW_H);
    gwinGraphDrawPoint(gh, pos_X, pos_Y);

    pos_X ++;
    if (pos_X >= WINDOW_W) {
        pos_X = WINDOW_X;
    }
}