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#include "mplot.h"
Image *offscreen;
static int buffer;
static Point
xlp(Point p)
{
p.x += screen->r.min.x + 4 - offscreen->r.min.x;
p.y += screen->r.min.y + 4 - offscreen->r.min.y;
return p;
}
static Rectangle
xlr(Rectangle r)
{
int dx, dy;
dx = screen->r.min.x + 4 - offscreen->r.min.x;
dy = screen->r.min.y + 4 - offscreen->r.min.y;
r.min.x += dx;
r.min.y += dy;
r.max.x += dx;
r.max.y += dy;
return r;
}
/*
* 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);
if(offscreen != screen && !buffer)
draw(screen, xlr(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;
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);
if(offscreen != screen && !buffer)
stringn(screen, xlp(Pt(x, y-tsize.y/2)), getcolor(c), ZP, font, p, q-p);
return y+tsize.y;
}
/*
* draw point x, y
*/
void
m_dpt(double x, double y)
{
Image *c;
c = getcolor(e1->foregr);
draw(offscreen, Rect(SCX(x), SCY(y), SCX(x)+1, SCY(y)+1), c, nil, ZP);
if(offscreen != screen && !buffer)
draw(screen, xlr(Rect(SCX(x), SCY(y), SCX(x)+1, SCY(y)+1)), c, nil, ZP);
}
/*
* 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);
if(offscreen != screen && !buffer)
line(screen, xlp(Pt(x0, y0)), xlp(Pt(x1, y1)), Endsquare, Endsquare, 0, getcolor(c), ZP);
}
/*
* Startup initialization
*/
void m_initialize(char*)
{
static int once;
int dx, dy;
if(once)
return;
once = 1;
if(initdraw(nil, nil, "plot") < 0)
sysfatal("initdraw: %r");
///// einit(Emouse);
offscreen = allocimage(display, insetrect(screen->r, 4), screen->chan, 0, -1);
if(offscreen == nil)
sysfatal("Can't double buffer\n");
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;
}
}
/*
* Clean up when finished
*/
void m_finish(void)
{
m_swapbuf();
}
void m_swapbuf(void)
{
draw(screen, insetrect(screen->r, 4), offscreen, nil, offscreen->r.min);
flushimage(display, 1);
}
void m_dblbuf(void)
{
buffer = 1;
}
/*
* 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)
sysfatal("plot: can't allocate image for color: %r");
for(j=0; j<nelem(icache); j++)
if(icache[j].i == nil){
icache[j].v = v;
icache[j].i = i;
break;
}
if(j == nelem(icache))sysfatal("icache: too small");
return i;
}
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