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#include <world.h>
#define getWidth() (lineCount*HLINE)
#define GEN_INC 10
#define GRASS_HEIGHT 4
World::World(unsigned int width){
unsigned int i;
float inc;
lineCount=width+GEN_INC;
line=(struct line_t *)calloc(lineCount,sizeof(struct line_t)); // allocate space for the array of lines
line[0].y=80;
for(i=GEN_INC;i<lineCount;i+=GEN_INC){
line[i].y=rand()%8-4+line[i-GEN_INC].y;
if(line[i].y<60)line[i].y=60;
if(line[i].y>110)line[i].y=110;
}
for(i=0;i<lineCount-GEN_INC;i++){
if(!i||!(i%GEN_INC)){
inc=(line[i+GEN_INC].y-line[i].y)/(float)GEN_INC;
}else{
line[i].y=line[i-1].y+inc;
}
line[i].color=rand()%20+130;
}
/*line[0].y=50;
for(i=1;i<lineCount-20;i++){
line[i].y=rand()%5-2+line[i-1].y;
if(line[i].y<30)line[i].y=30;
}*/
}
World::~World(void){
free(line);
}
void World::draw(vec2 *vec){
int i,ie,v_offset;
x_start=0-getWidth()/2+GEN_INC/2*HLINE;
v_offset=(vec->x-x_start)/HLINE;
i=v_offset-SCREEN_WIDTH/2;
if(i<0)i=0;
ie=v_offset+SCREEN_WIDTH/2;
if(ie>lineCount)ie=lineCount;
glBegin(GL_QUADS);
for(i=i;i<ie;i++){
glColor3ub(0,200,0);
glVertex2i(x_start+i*HLINE ,line[i].y);
glVertex2i(x_start+i*HLINE+HLINE,line[i].y);
glVertex2i(x_start+i*HLINE+HLINE,line[i].y-GRASS_HEIGHT);
glVertex2i(x_start+i*HLINE ,line[i].y-GRASS_HEIGHT);
glColor3ub(line[i].color,line[i].color-50,line[i].color-100);
glVertex2i(x_start+i*HLINE ,line[i].y-GRASS_HEIGHT);
glVertex2i(x_start+i*HLINE+HLINE,line[i].y-GRASS_HEIGHT);
glVertex2i(x_start+i*HLINE+HLINE,0);
glVertex2i(x_start+i*HLINE ,0);
}
glEnd();
}
void World::detect(vec2 *v,vec2 *vel,const float width){
unsigned int i;
i=(v->x+width/2-x_start)/HLINE;
if(v->y<=line[i].y){
vel->y=0;
v->y=line[i].y+HLINE/2;
return;
}else{
vel->y-=.05;
return;
}
}
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