352 lines
8.4 KiB
C
352 lines
8.4 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 Kevin Ferrare
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*
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* Mystify demo plugin
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "plugin.h"
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#ifdef HAVE_LCD_BITMAP
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/* Key assignement */
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#define DEMYSTIFY_QUIT BUTTON_OFF
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#define DEMYSTIFY_ADD_POLYGON BUTTON_UP
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#define DEMYSTIFY_REMOVE_POLYGON BUTTON_DOWN
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#define DEMYSTIFY_INCREASE_SPEED BUTTON_RIGHT
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#define DEMYSTIFY_DECREASE_SPEED BUTTON_LEFT
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#define DEFAULT_WAIT_TIME 3
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#define DEFAULT_NB_POLYGONS 7
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#define NB_POINTS 4
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#define MAX_STEP_RANGE 7
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#define MIN_STEP_RANGE 3
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#define MAX_POLYGONS 40
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#define MIN_POLYGONS 1
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/******************************* Globals ***********************************/
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static struct plugin_api* rb; /* global api struct pointer */
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/*
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* Compute a new random step to make the point bounce the borders of the screen
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*/
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int get_new_step(int step)
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{
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if(step>0)
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return -(MIN_STEP_RANGE + rb->rand() % (MAX_STEP_RANGE-MIN_STEP_RANGE));
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else
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return (MIN_STEP_RANGE + rb->rand() % (MAX_STEP_RANGE-MIN_STEP_RANGE));
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}
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/*
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* Point Stuffs
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*/
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struct point
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{
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int x;
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int y;
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};
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/*
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* Polygon Stuffs
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*/
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struct polygon
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{
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struct point points[NB_POINTS];
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};
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/*
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* Generates a random polygon (which fits the screen size though)
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*/
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void polygon_init(struct polygon * polygon)
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{
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int i;
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for(i=0;i<NB_POINTS;++i)
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{
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polygon->points[i].x=(rb->rand() % (LCD_WIDTH));
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polygon->points[i].y=(rb->rand() % (LCD_HEIGHT));
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}
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}
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/*
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* Draw the given polygon onto the screen
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*/
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void polygon_draw(struct polygon * polygon)
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{
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int i;
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for(i=0;i<NB_POINTS-1;++i)
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{
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rb->lcd_drawline(polygon->points[i].x, polygon->points[i].y,
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polygon->points[i+1].x, polygon->points[i+1].y);
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}
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rb->lcd_drawline(polygon->points[0].x, polygon->points[0].y,
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polygon->points[NB_POINTS-1].x,
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polygon->points[NB_POINTS-1].y);
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}
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/*
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* Polygon moving data Stuffs
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*/
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struct polygon_move
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{
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struct point move_steps[NB_POINTS];
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};
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void polygon_move_init(struct polygon_move * polygon_move)
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{
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int i;
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for(i=0;i<NB_POINTS;++i)
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{
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polygon_move->move_steps[i].x=get_new_step(-1);
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/* -1 because we want a positive random step */
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polygon_move->move_steps[i].y=get_new_step(-1);
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}
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}
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/*
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* Update the given polygon's position according to the given informations in
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* polygon_move (polygon_move may be updated)
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*/
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void polygon_update(struct polygon *polygon, struct polygon_move *polygon_move)
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{
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int i, x, y, step;
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for(i=0;i<NB_POINTS;++i)
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{
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x=polygon->points[i].x;
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step=polygon_move->move_steps[i].x;
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x+=step;
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if(x<=0)
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{
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x=1;
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polygon_move->move_steps[i].x=get_new_step(step);
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}
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else if(x>=LCD_WIDTH)
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{
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x=LCD_WIDTH-1;
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polygon_move->move_steps[i].x=get_new_step(step);
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}
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polygon->points[i].x=x;
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y=polygon->points[i].y;
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step=polygon_move->move_steps[i].y;
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y+=step;
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if(y<=0)
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{
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y=1;
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polygon_move->move_steps[i].y=get_new_step(step);
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}
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else if(y>=LCD_HEIGHT)
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{
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y=LCD_HEIGHT-1;
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polygon_move->move_steps[i].y=get_new_step(step);
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}
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polygon->points[i].y=y;
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}
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}
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/*
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* Polygon fifo Stuffs
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*/
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struct polygon_fifo
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{
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int fifo_tail;
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int fifo_head;
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int nb_items;
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struct polygon tab[MAX_POLYGONS];
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};
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void fifo_init(struct polygon_fifo * fifo)
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{
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fifo->fifo_tail=0;
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fifo->fifo_head=0;
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fifo->nb_items=0;
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}
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void fifo_push(struct polygon_fifo * fifo, struct polygon * polygon)
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{
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if(fifo->nb_items>=MAX_POLYGONS)
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return;
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++(fifo->nb_items);
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/*
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* Workaround for gcc (which uses memcpy internally) to avoid link error
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* fifo->tab[fifo->fifo_head]=polygon
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*/
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rb->memcpy(&(fifo->tab[fifo->fifo_head]), polygon, sizeof(struct polygon));
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++(fifo->fifo_head);
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if(fifo->fifo_head>=MAX_POLYGONS)
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fifo->fifo_head=0;
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}
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struct polygon * fifo_pop(struct polygon_fifo * fifo)
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{
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int index;
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if(fifo->nb_items==0)
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return(NULL);
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--(fifo->nb_items);
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index=fifo->fifo_tail;
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++(fifo->fifo_tail);
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if(fifo->fifo_tail>=MAX_POLYGONS)
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fifo->fifo_tail=0;
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return(&(fifo->tab[index]));
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}
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/*
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* Drawing stuffs
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*/
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void polygons_draw(struct polygon_fifo * polygons)
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{
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int i, j;
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for(i=0, j=polygons->fifo_tail;i<polygons->nb_items;++i, ++j)
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{
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if(j>=MAX_POLYGONS)
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j=0;
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polygon_draw(&(polygons->tab[j]));
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}
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}
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static struct polygon_fifo polygons;
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static struct polygon_move move; /* This describes the movement of the leading
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polygon, the others just follow */
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static struct polygon leading_polygon;
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void cleanup(void *parameter)
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{
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(void)parameter;
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rb->backlight_set_timeout(rb->global_settings->backlight_timeout);
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}
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/*
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* Main function
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*/
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int plugin_main(void)
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{
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int button;
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int sleep_time=DEFAULT_WAIT_TIME;
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int nb_wanted_polygons=DEFAULT_NB_POLYGONS;
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fifo_init(&polygons);
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polygon_move_init(&move);
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polygon_init(&leading_polygon);
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while (true)
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{
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if(polygons.nb_items>nb_wanted_polygons)
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{ /* We have too many polygons, we must drop some of them */
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fifo_pop(&polygons);
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}
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if(nb_wanted_polygons==polygons.nb_items)
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{ /* We have the good number of polygons, we can safely drop the last
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one to add the new one later */
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fifo_pop(&polygons);
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}
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fifo_push(&polygons, &leading_polygon);
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/*
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* Then we update the leading polygon for the next round acording to
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* current move (the move may be altered in case of sreen border
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* collision)
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*/
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polygon_update(&leading_polygon, &move);
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/* Now the drawing part */
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rb->lcd_clear_display();
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polygons_draw(&polygons);
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rb->lcd_update();
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/* Speed handling*/
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if (sleep_time<0)/* full speed */
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rb->yield();
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else
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rb->sleep(sleep_time);
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/* Handle the user events */
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button = rb->button_get(false);
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switch(button)
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{
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case (DEMYSTIFY_QUIT):
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cleanup(NULL);
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return PLUGIN_OK;
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case (DEMYSTIFY_ADD_POLYGON):
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if(nb_wanted_polygons<MAX_POLYGONS)
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++nb_wanted_polygons;
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break;
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case (DEMYSTIFY_REMOVE_POLYGON):
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if(nb_wanted_polygons>MIN_POLYGONS)
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--nb_wanted_polygons;
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break;
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case (DEMYSTIFY_INCREASE_SPEED):
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if(sleep_time>=0)
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--sleep_time;
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break;
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case (DEMYSTIFY_DECREASE_SPEED):
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++sleep_time;
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break;
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default:
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if (rb->default_event_handler_ex(button, cleanup, NULL)
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== SYS_USB_CONNECTED)
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return PLUGIN_USB_CONNECTED;
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break;
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}
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}
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}
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/*************************** Plugin entry point ****************************/
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enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
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{
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int ret;
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/*
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* this macro should be called as the first thing you do in the plugin.
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* it test that the api version and model the plugin was compiled for
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* matches the machine it is running on
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*/
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TEST_PLUGIN_API(api);
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rb = api; /* copy to global api pointer */
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(void)parameter;
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if (rb->global_settings->backlight_timeout > 0)
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rb->backlight_set_timeout(1);/* keep the light on */
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ret = plugin_main();
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return ret;
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}
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#endif /* #ifdef HAVE_LCD_BITMAP */
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