106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
/**
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* \file
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* Copyright 2004, 2006 Develer S.r.l. (http://www.develer.com/)
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*
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*
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* \brief Graphics user interface element to display a level bar.
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*
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* \author Stefano Fedrigo <aleph@develer.com>
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*/
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#include "levelbar.h"
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/**
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* Initialize the LevelBar widget with the bitmap associated,
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* the value range and the coordinates in the bitmap.
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* \note The levelbar should be at least 5 pixels wide and high
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* for correct borders drawing. No check is done on this.
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*/
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void lbar_init(struct LevelBar *lb, struct Bitmap *bmp, int type, int min, int max, int pos,
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coord_t x1, coord_t y1, coord_t x2, coord_t y2)
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{
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lb->bitmap = bmp;
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lb->type = type;
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lb->min = min;
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lb->max = max;
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lb->pos = pos;
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lb->x1 = x1;
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lb->y1 = y1;
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lb->x2 = x2;
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lb->y2 = y2;
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}
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/**
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* Set the level.
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*/
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void lbar_setLevel(struct LevelBar *lb, int level)
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{
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if (level < lb->min)
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level = lb->min;
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if (level > lb->max)
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level = lb->max;
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lb->pos = level;
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}
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/**
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* Get current level.
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*/
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int lbar_getLevel(struct LevelBar *lb)
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{
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return lb->pos;
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}
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/**
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* Change level with respect to previous value
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* (delta can be negative).
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*/
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void lbar_changeLevel(struct LevelBar *lb, int delta)
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{
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lbar_setLevel(lb, lb->pos + delta);
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}
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/**
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* Change the top limit.
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*/
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void lbar_setMax(struct LevelBar *lb, int max)
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{
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lb->max = max;
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}
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/**
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* Render the LevelBar on the bitmap.
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*/
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void lbar_draw(struct LevelBar *lb)
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{
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#define BORDERW 1
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#define BORDERH 1
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/* Compute filled bar length in pixels */
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int totlen = (lb->type & LBAR_HORIZONTAL) ? lb->x2 - lb->x1 - BORDERW*4 : lb->y2 - lb->y1 - BORDERH*4;
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int range = lb->max - lb->min;
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int barlen = ((long)(lb->pos - lb->min) * (long)totlen + range - 1) / range;
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// Draw border
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gfx_rectDraw(lb->bitmap, lb->x1, lb->y1, lb->x2, lb->y2);
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// Clear inside
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gfx_rectClear(lb->bitmap, lb->x1 + BORDERW, lb->y1 + BORDERH, lb->x2 - BORDERW, lb->y2 - BORDERH);
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// Draw bar
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if (lb->type & LBAR_HORIZONTAL)
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gfx_rectFill(lb->bitmap,
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lb->x1 + BORDERW*2, lb->y1 + BORDERH*2,
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lb->x1 + BORDERW*2 + barlen, lb->y2 - BORDERH*2);
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else
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gfx_rectFill(lb->bitmap,
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lb->x1 + BORDERW*2, lb->y2 - BORDERH*2 - barlen,
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lb->x2 - BORDERW*2, lb->y2 - BORDERH*2);
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}
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