levelbar.c

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#include "levelbar.h"


void lbar_init(struct LevelBar *lb, struct Bitmap *bmp, int type, int min, int max, int pos,
        coord_t x1, coord_t y1, coord_t x2, coord_t y2)
{
    lb->bitmap = bmp;
    lb->type = type;
    lb->min = min;
    lb->max = max;
    lb->pos = pos;
    lb->x1 = x1;
    lb->y1 = y1;
    lb->x2 = x2;
    lb->y2 = y2;
}


void lbar_setLevel(struct LevelBar *lb, int level)
{
    if (level < lb->min)
        level = lb->min;
    if (level > lb->max)
        level = lb->max;

    lb->pos = level;
}


int lbar_getLevel(struct LevelBar *lb)
{
    return lb->pos;
}


void lbar_changeLevel(struct LevelBar *lb, int delta)
{
    lbar_setLevel(lb, lb->pos + delta);
}


void lbar_setMax(struct LevelBar *lb, int max)
{
    lb->max = max;
}


void lbar_draw(struct LevelBar *lb)
{
#define BORDERW 1
#define BORDERH 1

    /* Compute filled bar length in pixels */
    int totlen = (lb->type & LBAR_HORIZONTAL) ? lb->x2 - lb->x1 - BORDERW*4 : lb->y2 - lb->y1 - BORDERH*4;
    int range  = lb->max - lb->min;
    int barlen = ((long)(lb->pos - lb->min) * (long)totlen + range - 1) / range;

    // Draw border
    gfx_rectDraw(lb->bitmap, lb->x1, lb->y1, lb->x2, lb->y2);

    // Clear inside
    gfx_rectClear(lb->bitmap, lb->x1 + BORDERW, lb->y1 + BORDERH, lb->x2 - BORDERW, lb->y2 - BORDERH);

    // Draw bar
    if (lb->type & LBAR_HORIZONTAL)
        gfx_rectFill(lb->bitmap,
                lb->x1 + BORDERW*2, lb->y1 + BORDERH*2,
                lb->x1 + BORDERW*2 + barlen, lb->y2 - BORDERH*2);
    else
        gfx_rectFill(lb->bitmap,
                lb->x1 + BORDERW*2, lb->y2 - BORDERH*2 - barlen,
                lb->x2 - BORDERW*2, lb->y2 - BORDERH*2);
}