charts.c

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#include "charts.h"
#include <gfx/gfx.h>


#ifndef CONFIG_CHART_ARROWS
#define CONFIG_CHART_ARROWS 0
#endif


void chart_init(Bitmap *bm, coord_t xmin, coord_t ymin, coord_t xmax, coord_t ymax)
{
    /* Clear the chart area */
    gfx_rectClear(bm, xmin, ymin, xmax, ymax);

    gfx_setClipRect(bm, xmin + CHART_BORDERLEFT, ymin + CHART_BORDERTOP,
        xmax - CHART_BORDERRIGHT, ymax - CHART_BORDERBOTTOM);

    chart_drawAxis(bm);
}


void chart_setScale(Bitmap *bm, chart_x_t xmin, chart_y_t ymin, chart_x_t xmax, chart_y_t ymax)
{
    gfx_setViewRect(bm, xmin, ymin, xmax, ymax);
}


void chart_drawAxis(Bitmap *bm)
{
#if CONFIG_CHART_ARROWS

    /* Draw axis */
    gfx_moveTo(bm, bm->cr.xmin, bm->cr.ymin + 4);
    gfx_lineTo(bm, bm->cr.xmin, bm->cr.ymax - 1);
    gfx_lineTo(bm, bm->cr.xmax - 4 - 1, bm->cr.ymax - 1);

    /* Draw up arrow */
    gfx_moveTo(bm, bm->cr.xmin - 2, bm->cr.ymin + 3);
    gfx_lineTo(bm, bm->cr.xmin + 2, bm->cr.ymin + 3);
    gfx_lineTo(bm, bm->cr.xmin, bm->cr.ymin);
    gfx_lineTo(bm, bm->cr.xmin - 2, bm->cr.ymin + 3);

    /* Draw right arrow */
    gfx_moveTo(bm, bm->cr.xmax - 4, bm->cr.ymax - 3);
    gfx_lineTo(bm, bm->cr.xmax - 4, bm->cr.ymax + 1);
    gfx_lineTo(bm, bm->cr.xmax - 1, bm->cr.ymax - 1);
    gfx_lineTo(bm, bm->cr.xmax - 4, bm->cr.ymax - 3);

#else /* CONFIG_CHART_ARROWS */

    /* Draw a box around the chart */
    gfx_rectDraw(bm, bm->cr.xmin, bm->cr.ymin, bm->cr.xmax, bm->cr.ymax);

#endif /* CONFIG_CHART_ARROWS */

    //CHECK_WALL(wall_before_raster, WALL_SIZE);
    //CHECK_WALL(wall_after_raster, WALL_SIZE);
}


void chart_drawCurve(Bitmap *bm, const chart_y_t *curve_y, int curve_cnt)
{
    int i;

    gfx_moveTo(bm, gfx_transformX(bm, 0), gfx_transformY(bm, curve_y[0]));

    for (i = 1; i < curve_cnt; i++)
        gfx_lineTo(bm, gfx_transformX(bm, i), gfx_transformY(bm, curve_y[i]));

    //CHECK_WALL(wall_before_raster, WALL_SIZE);
    //CHECK_WALL(wall_after_raster, WALL_SIZE);
}


void chart_drawDots(Bitmap *bm, const chart_x_t *dots_x, const chart_y_t *dots_y, int cnt)
{
    int i;
    coord_t x, y;

    for (i = 0; i < cnt; i++)
    {
        if (dots_x)
            x = gfx_transformX(bm, dots_x[i]);
        else
            x = gfx_transformX(bm, i);

        y = gfx_transformY(bm, dots_y[i]);

        /* Draw tick over the curve */
        gfx_rectFill(bm,
            x - TICKS_WIDTH / 2, y - TICKS_HEIGHT / 2,
            x + (TICKS_WIDTH + 1) / 2, y + (TICKS_HEIGHT + 1) / 2);

        /* Draw vertical line from the curve to the X-axis */
        //gfx_drawLine(bm, x, y, x, bm->cr.ymax - 1);
    }

    //CHECK_WALL(wall_before_raster, WALL_SIZE);
    //CHECK_WALL(wall_after_raster, WALL_SIZE);
}