From 131e49b2e6436f87d328ea10bd192e62bf6c2cb0 Mon Sep 17 00:00:00 2001
From: epoch <epoch@hacking.allowed.org>
Date: Sun, 11 Oct 2020 01:41:52 -0500
Subject: mix of last commit and specific draw case for 2-pointed shapes

---
 src/graphics_cs_fb.c | 95 +++++++++++++++++++---------------------------------
 1 file changed, 35 insertions(+), 60 deletions(-)

diff --git a/src/graphics_cs_fb.c b/src/graphics_cs_fb.c
index e32da74..0712bcd 100644
--- a/src/graphics_cs_fb.c
+++ b/src/graphics_cs_fb.c
@@ -63,8 +63,8 @@ void set_luminosity_color(int lum) {//need to come up with a good range for this
 
 void draw_cs_point(int x,int y) {//this should write to a backbuffer then I can memcopy it over.
  unsigned int i=y * fb_global.info.xres + x;
- if(x > fb_global.info.xres) return;
- if(y > fb_global.info.yres) return;
+ if(x >= fb_global.info.xres) return;
+ if(y >= fb_global.info.yres) return;
  if(i > fb_global.fblen) return;
  //hack to test it with. remove me later.
  //fb_global.current_color=-1;
@@ -89,10 +89,33 @@ void draw_cs_point(int x,int y) {//this should write to a backbuffer then I can
  }
 }
 
-void draw_cs_arc() {//now... how to draw an arc.
+void draw_cs_arc(cs_t p1, cs_t p2) {//now... how to draw an arc.
+//  real r;//radius
+//  y=sin();
+//  x=cos();
+}
 
+int x_from_y(cs_t p1,cs_t p2,int y) {//get the value of x given a y within a line.
+ real m;
+ int b;
+ int x;
+// y=mx+b MAGIC
+ if(p1.x == p2.x) return p1.x;//if this happens then we have a verticle line and can just shortcut this shit.
+ if(p1.y == p2.y) {//if this happens we have a horizontal line we're trying to find the X of based on a 'y' that probably isn't in the line...
+  return 0;
+ }//return p1.x;//WE SHOULD NOT GET HERE. fuck if I know.
+// y=mx+b
+// y-b=mx
+// x=(y-b)/m
+// b=y-mx
+ m=((real)(p1.y-p2.y))/((real)(p1.x-p2.x));
+ b=(int)((real)p1.y - (m * (real)p1.x));
+ x=(int)(((real)(y-b))/m);
+ if(!x) printf("x == %d y=%d m=%f b=%d\n",x,y,m,b);
+ return x;
 }
 
+//does this actually work? seems to.
 void draw_cs_line(cs_t p1,cs_t p2) {//error somewhere in here. derp...
   int x,y;
   real m;
@@ -110,13 +133,14 @@ void draw_cs_line(cs_t p1,cs_t p2) {//error somewhere in here. derp...
     }
     return;
   }
+  //this isn't working for some reason.
   xd=p1.x<p2.x?1:-1;
   yd=p1.y<p2.y?1:-1;
-  if(max(p1.x,p2.x)-min(p1.x,p2.x) >= max(p1.y,p2.y)-min(p1.y,p2.y)) { //loop over x. like normal math. :P y=mx+b stuff.
+  if(max(p1.x,p2.x)-min(p1.x,p2.x) > max(p1.y,p2.y)-min(p1.y,p2.y)) { //loop over x. like normal math. :P y=mx+b stuff.
    m=((real)(p1.y-p2.y))/((real)(p1.x-p2.x));
    b=(int)((real)p1.y - (m * (real)p1.x));
    for(x=p1.x;x!=p2.x;x+=xd) {
-    y=(int)(m * (real)x + (real)b); 
+    y=(int)(m * (real)x + (real)b);
     draw_cs_point(x,y);
    }
   } else { //loop over y
@@ -127,7 +151,7 @@ void draw_cs_line(cs_t p1,cs_t p2) {//error somewhere in here. derp...
      draw_cs_point(x,y);
    }
   }
-  //now for the fun part.
+  // ???
 }
 
 void draw_cs_text(cs_t p,char *text) {
@@ -141,13 +165,6 @@ void draw_cs_text(cs_t p,char *text) {
 }
 
 void draw_cs_shape(cs_s_t s) {//this is implemented as draw_cs_line... hrm. it could be moved up to graphics.c? probl no.
-  //test in here whether a mouse click is within this shape's... bounding box? sure.
-  cs_s_t bb;//bounding box
-  int minx=s.p[0].x;
-  int miny=s.p[0].y;
-  int maxx=s.p[0].x;
-  int maxy=s.p[0].y;
-  //int h;
   int i;//all cs shapes can have 1, 2, or 3+ points. guess I gotta do that logic here too.
   switch(s.len) {
    case 1:
@@ -155,59 +172,16 @@ void draw_cs_shape(cs_s_t s) {//this is implemented as draw_cs_line... hrm. it c
     //h=max(s.p[0].x,s.p[1].x)-min(s.p[0].x,s.p[1].x);
     //XDrawArc(x11_global.dpy,x11_global.backbuffer,x11_global.backgc,s.p[0].x-h,s.p[0].y-h,h*2,h*2,0,360*64);
     break;
+   case 2:
+    draw_cs_line(s.p[0],s.p[1]);
    default:
-    for(i=0;i<s.len+(s.len==1);i++) {//this shape is closed!
-      minx=(s.p[i].x<minx)?s.p[i].x:minx;
-      miny=(s.p[i].y<miny)?s.p[i].y:miny;
-      maxx=(s.p[i].x>maxx)?s.p[i].x:maxx;
-      maxy=(s.p[i].y>maxy)?s.p[i].y:maxy;
-    //  draw_cs_line(s.p[i],s.p[(i+1)%(s.len+(s.len==1))]);
-    }
-    if(gra_global.mouse.x >= minx &&
-         gra_global.mouse.y >= miny &&
-         gra_global.mouse.x <= maxx &&
-         gra_global.mouse.y <= maxy) {
-      if(gra_global.mousemap[0] == -1) {//if we're inside the bounding box let's make SOMETHING happen.
-        gra_global.mousemap[0]=0;
-        printf("%s action %s\n",global.user,s.id);
-      }
-      bb.id=strdup("boundingbox");
-      bb.len=4;
-      bb.p[0].x=minx;
-      bb.p[0].y=miny;
-      bb.p[1].x=minx;
-      bb.p[1].y=maxy;
-      bb.p[2].x=maxx;
-      bb.p[2].y=maxy;
-      bb.p[3].x=maxx;
-      bb.p[3].y=miny;
-      draw_cs_filled_shape(bb);
-      free(bb.id);
+    for(i=0;i<s.len;i++) {
+      draw_cs_line(s.p[i],s.p[(i+1)%s.len]);
     }
     break;
   }
 }
 
-int x_from_y(cs_t p1,cs_t p2,int y) {//get the value of x given a y within a line.
- real m;
- int b;
- int x;
-// y=mx+b MAGIC
- if(p1.x == p2.x) return p1.x;//if this happens then we have a verticle line and can just shortcut this shit.
- if(p1.y == p2.y) {//if this happens we have a horizontal line we're trying to find the X of based on a 'y' that probably isn't in the line...
-  return 0;
- }//return p1.x;//WE SHOULD NOT GET HERE. fuck if I know.
-// y=mx+b
-// y-b=mx
-// x=(y-b)/m
-// b=y-mx
- m=((real)(p1.y-p2.y))/((real)(p1.x-p2.x));
- b=(int)((real)p1.y - (m * (real)p1.x));
- x=(int)(((real)(y-b))/m);
- if(!x) printf("x == %d y=%d m=%f b=%d\n",x,y,m,b);
- return x;
-}
-
 void draw_cs_filled_shape(cs_s_t s) {//no circle handling atm. and only convex polygons.
  int maxmax=0;
  int minmin=0;
@@ -232,6 +206,7 @@ void draw_cs_filled_shape(cs_s_t s) {//no circle handling atm. and only convex p
   draw_cs_line(p1,p2);//the two y values are always the same here.
  }
 }
+
 /*
 void draw_cs_filled_shape(cs_s_t s) {
   int h;
-- 
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