From 12406c361e2a65637beec739f9983bb088e26da7 Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Thu, 14 May 2020 21:00:54 +0000
Subject: new toy: isometric grid: add some more stats updated pic files to
 rgba and no floyd-steinberg dithering

---
 isometric.c | 168 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 isometric.c

(limited to 'isometric.c')

diff --git a/isometric.c b/isometric.c
new file mode 100644
index 0000000..3595035
--- /dev/null
+++ b/isometric.c
@@ -0,0 +1,168 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <geometry.h>
+#include <event.h>
+#include <keyboard.h>
+
+enum {
+	Cbg,
+	Cfg,
+	Ctxtbg,
+	NCOLOR
+};
+
+enum {
+	TW = 16,
+	TH = 8
+};
+
+typedef struct Tile Tile;
+struct Tile
+{
+	char *name;
+	char id;
+	Image *img;
+};
+
+Image *pal[NCOLOR];
+Tile tiles[] = {
+	{ .name = "empty", .id = 'e' },
+	{ .name = "filled", .id = 'f' }
+};
+RFrame worldrf;
+char *map[] = {
+	"eeeee",
+	"eefee",
+	"efefe",
+	"eefee",
+	"eefee"
+};
+Point mpos;
+
+Point
+toscreen(Point2 p)
+{
+	p = invrframexform(p, worldrf);
+	return Pt(p.x,p.y);
+}
+
+Point2
+fromscreen(Point p)
+{
+	return rframexform(Pt2(p.x,p.y,1), worldrf);
+}
+
+void
+initpalette(void)
+{
+	pal[Cbg] = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DBlack);
+	pal[Cfg] = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DDarkblue);
+	pal[Ctxtbg] = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DPaleyellow);
+}
+
+void
+inittiles(void)
+{
+	char path[256];
+	int fd, i;
+
+	for(i = 0; i < nelem(tiles); i++){
+		snprint(path, sizeof path, "asset/tile/%s.pic", tiles[i].name);
+		fd = open(path, OREAD);
+		tiles[i].img = readimage(display, fd, 0);
+		close(fd);
+	}
+}
+
+void
+drawstats(void)
+{
+	Point2 mp, p;
+	char s[256];
+
+	mp = fromscreen(mpos);
+	snprint(s, sizeof s, "Global %v", mp);
+	stringbg(screen, addpt(screen->r.min, Pt(20,20)), pal[Cfg], ZP, font, s, pal[Ctxtbg], ZP);
+	p = Pt2(fmod(mp.x, TW),fmod(mp.y, TH),1);
+	snprint(s, sizeof s, "Local %v", p);
+	stringbg(screen, addpt(screen->r.min, Pt(20,20+font->height)), pal[Cfg], ZP, font, s, pal[Ctxtbg], ZP);
+	p = Pt2((int)mp.x/TW,(int)mp.y/TH,1);
+	snprint(s, sizeof s, "Cell %v", p);
+	stringbg(screen, addpt(screen->r.min, Pt(20,20+font->height*2)), pal[Cfg], ZP, font, s, pal[Ctxtbg], ZP);
+}
+
+void
+redraw(void)
+{
+	Point2 dp;
+	int i, j;
+	char *row;
+
+	draw(screen, screen->r, pal[Cbg], nil, ZP);
+	for(i = 0; i < nelem(map); i++)
+		for(row = map[i]; *row; row++){
+			dp = Pt2((row-map[i]-i)*TW/2,(i+row-map[i])*TH/2,1);
+			for(j = 0; j < nelem(tiles); j++)
+				if(tiles[j].id == *row)
+					draw(screen, Rpt(toscreen(dp),addpt(toscreen(dp), Pt(TW,TH))), tiles[j].img, nil, ZP);
+		}
+	drawstats();
+	flushimage(display, 1);
+}
+
+void
+usage(void)
+{
+	fprint(2, "usage: %s\n", argv0);
+	exits("usage");
+}
+
+void
+main(int argc, char *argv[])
+{
+	Event e;
+
+	GEOMfmtinstall();
+	ARGBEGIN{
+	default: usage();
+	}ARGEND;
+	if(argc > 0)
+		usage();
+	if(initdraw(nil, nil, nil) < 0)
+		sysfatal("initdraw: %r");
+	initpalette();
+	inittiles();
+	worldrf.p = Pt2(screen->r.min.x,screen->r.min.y,1);
+	worldrf.p = addpt2(worldrf.p, Vec2(Dx(screen->r)/2,Dy(screen->r)/3));
+	worldrf.bx = Vec2(1,0);
+	worldrf.by = Vec2(0,1);
+	einit(Emouse|Ekeyboard);
+	redraw();
+	for(;;)
+		switch(event(&e)){
+		case Emouse:
+			mpos = e.mouse.xy;
+			if((e.mouse.buttons&1) != 0)
+				worldrf.p = Pt2(e.mouse.xy.x,e.mouse.xy.y,1);
+			redraw();
+			break;
+		case Ekeyboard:
+			switch(e.kbdc){
+			case 'q':
+			case Kdel:
+				exits(0);
+			}
+			break;
+		}
+}
+
+void
+eresized(int)
+{
+	if(getwindow(display, Refnone) < 0)
+		sysfatal("resize failed");
+	worldrf.p = Pt2(screen->r.min.x,screen->r.min.y,1);
+	worldrf.p = addpt2(worldrf.p, Vec2(Dx(screen->r)/2,Dy(screen->r)/3));
+	redraw();
+}
-- 
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