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#include "mplot.h"
Image *offscreen;
/*
* Clear the window from x0, y0 to x1, y1 (inclusive) to color c
*/
void m_clrwin(int x0, int y0, int x1, int y1, int c){
draw(offscreen, Rect(x0, y0, x1+1, y1+1), getcolor(c), nil, ZP);
}
/*
* Draw text between pointers p and q with first character centered at x, y.
* Use color c. Centered if cen is non-zero, right-justified if right is non-zero.
* Returns the y coordinate for any following line of text.
*/
int m_text(int x, int y, char *p, char *q, int c, int cen, int right){
Point tsize;
USED(c);
tsize=stringsize(font, p);
if(cen) x -= tsize.x/2;
else if(right) x -= tsize.x;
stringn(offscreen, Pt(x, y-tsize.y/2), getcolor(c), ZP, font, p, q-p);
return y+tsize.y;
}
/*
* Draw the vector from x0, y0 to x1, y1 in color c.
* Clipped by caller
*/
void m_vector(int x0, int y0, int x1, int y1, int c){
line(offscreen, Pt(x0, y0), Pt(x1, y1), Endsquare, Endsquare, 0, getcolor(c), ZP);
}
char *scanint(char *s, int *n){
while(*s<'0' || '9'<*s){
if(*s=='\0'){
fprint(2, "plot: bad -Wxmin,ymin,xmax,ymax\n");
exits("bad arg");
}
s++;
}
*n=0;
while('0'<=*s && *s<='9'){
*n=*n*10+*s-'0';
s++;
}
return s;
}
char *rdenv(char *name){
char *v;
int fd, size;
fd=open(name, OREAD);
if(fd<0) return 0;
size=seek(fd, 0, 2);
v=malloc(size+1);
if(v==0){
fprint(2, "Can't malloc: %r\n");
exits("no mem");
}
seek(fd, 0, 0);
read(fd, v, size);
v[size]=0;
close(fd);
return v;
}
/*
* Startup initialization
*/
void m_initialize(char *s){
static int first=1;
int dx, dy;
USED(s);
if(first){
initdraw(0,0,"plot");
einit(Emouse);
clipminx=mapminx=screen->r.min.x+4;
clipminy=mapminy=screen->r.min.y+4;
clipmaxx=mapmaxx=screen->r.max.x-5;
clipmaxy=mapmaxy=screen->r.max.y-5;
dx=clipmaxx-clipminx;
dy=clipmaxy-clipminy;
if(dx>dy){
mapminx+=(dx-dy)/2;
mapmaxx=mapminx+dy;
}
else{
mapminy+=(dy-dx)/2;
mapmaxy=mapminy+dx;
}
first=0;
offscreen = screen;
}
}
/*
* Clean up when finished
*/
void m_finish(void){
m_swapbuf();
}
void m_swapbuf(void){
if(offscreen!=screen)
draw(screen, offscreen->r, offscreen, nil, offscreen->r.min);
flushimage(display, 1);
}
void m_dblbuf(void){
if(offscreen==screen){
offscreen=allocimage(display, insetrect(screen->r, 4), screen->chan, 0, -1);
if(offscreen==0){
fprintf(stderr, "Can't double buffer\n");
offscreen=screen;
}
}
}
/* Assume colormap entry because
* Use cache to avoid repeated allocation.
*/
struct{
int v;
Image *i;
}icache[32];
Image*
getcolor(int v)
{
Image *i;
int j;
for(j=0; j<nelem(icache); j++)
if(icache[j].v==v && icache[j].i!=nil)
return icache[j].i;
i = allocimage(display, Rect(0, 0, 1, 1), RGB24, 1, v);
if(i == nil){
fprint(2, "plot: can't allocate image for color: %r\n");
exits("allocimage");
}
for(j=0; j<nelem(icache); j++)
if(icache[j].i == nil){
icache[j].v = v;
icache[j].i = i;
break;
}
return i;
}
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