gr-sim: add another demo

gr-sim/Makefile

@@ -1,11 +1,11 @@
 CC = gcc
-CFLAGS = -Wall -O2
+CFLAGS = -Wall -O2 -g
 LFLAGS =
 
 SDL_LIBS= `sdl-config --libs`
 SDL_INCLUDE= `sdl-config --cflags`
 
-all:	rainbow
+all:	rainbow sparkle kaleido
 
 rainbow:	rainbow.o gr-sim.o
 	$(CC) $(LFLAGS) $(SDL_LIBS) -o rainbow rainbow.o gr-sim.o
@@ -14,10 +14,24 @@ rainbow.o:	rainbow.c
 	$(CC) $(CFLAGS) -c rainbow.c
 
 
+kaleido:	kaleido.o gr-sim.o
+	$(CC) $(LFLAGS) $(SDL_LIBS) -o kaleido kaleido.o gr-sim.o
+
+kaleido.o:	kaleido.c
+	$(CC) $(CFLAGS) -c kaleido.c
+
+
+sparkle:	sparkle.o gr-sim.o
+	$(CC) $(LFLAGS) $(SDL_LIBS) -o sparkle sparkle.o gr-sim.o
+
+sparkle.o:	sparkle.c
+	$(CC) $(CFLAGS) -c sparkle.c
+
+
 gr-sim.o:	gr-sim.c
 	$(CC) $(CFLAGS) $(SDL_INCLUDE) -c gr-sim.c
 
 clean:	
-	rm -f *~ *.o gr-sim rainbow
+	rm -f *~ *.o gr-sim rainbow sparkle kaleido
 
 

gr-sim/gr-sim.c

@@ -137,11 +137,28 @@ int grsim_init(void) {
 static int current_color=0;
 
 int color_equals(int new_color) {
-	current_color=new_color;
+	current_color=new_color%16;
 	return 0;
 }
 
 int plot(int x, int y) {
+	if (x>40) {
+		printf("X too big %d\n",x);
+		return -1;
+	}
+	if (y>40) {
+		printf("Y too big %d\n",y);
+		return -1;
+	}
+	if (x<0) {
+		printf("X too small %d\n",x);
+		return -1;
+	}
+	if (y<0) {
+		printf("Y too small %d\n",y);
+		return -1;
+	}
+
 	framebuffer[x][y]=current_color;
 	return 0;
 }
@@ -164,4 +181,11 @@ int vlin(int y1, int y2, int at) {
 	return 0;
 }
 
+int gr(void) {
+	int x,y;
 
+	/* Init screen */
+	for(y=0;y<YSIZE;y++) for(x=0;x<XSIZE;x++) framebuffer[x][y]=0;
+
+	return 0;
+}

gr-sim/gr-sim.h

@@ -6,3 +6,4 @@ int color_equals(int new_color);
 int plot(int x, int y);
 int hlin(int x1, int x2, int at);
 int vlin(int y1, int y2, int at);
+int gr(void);

gr-sim/kaleido.c

@@ -0,0 +1,118 @@
+/* Based on code from "32 BASIC Programs for the Apple Computer" 	*/
+/*			by Tom Rugg and Phil Feldman			*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "gr-sim.h"
+
+static int r[11];
+static int x,y,j,a,b,x2,y2,n;
+
+static void tooo(void) {
+
+	color_equals(r[n]);
+	plot(x2,y2);
+	return;
+}
+
+static void noo(void) {
+	int t,w;
+
+	// 900
+	color_equals(r[0]);
+	plot(x,y);
+	grsim_update();
+	if (j==1) return;
+	// 920
+	w=j/2;
+	t=j-w-1;
+	// 930
+	for(n=1;n<=w;n++) {
+		if (x==a) {
+			y2=y; x2=x+n; tooo();
+			x2=x-n;		tooo();
+			continue;
+		}
+		if (y==b) {
+			x2=x; y2=y+n; tooo();
+			y2=y-n;		tooo();
+			continue;
+		}
+		y2=y;
+		if (x<a) {
+			x2=x+n;	tooo();
+		}
+		else {
+			x2=x-n; tooo();
+		}
+		// 990
+		x2=x;
+		if (y<b) {
+			y2=y+n; tooo();
+		}
+		else {
+			y2=y-n; tooo();
+		}
+	}
+
+	return;
+
+}
+
+int main(int argc, char **argv) {
+
+	int ch;
+	int p,d,m,k,l;
+
+	grsim_init();
+
+	// 120
+	gr();
+	// 125
+	p=19;
+
+	// 130
+	a=p; b=p; d=-1;
+
+	// 135
+	m=15;
+
+label150:
+
+	// 150
+	for(j=0;j<=10;j++) {
+		r[j]=rand()%m;
+	}
+
+	// 180
+	d=-d; k=1; l=p;
+	if (d<=0) {
+		k=p;l=1;
+	}
+	// 200
+	for(j=k;j<=l;j+=d) {
+		x=a+j; y=b;	noo();
+		x=a-j;		noo();
+		x=a; y=b+j;	noo();
+		y=b-j;		noo();
+		x=a+j;y=b+j;	noo();
+		x=a-j;y=b-j;	noo();
+		y=b+j;		noo();
+		x=a+j; y=b-j;	noo();
+	}
+
+	for(j=1;j<10;j++) {
+		ch=grsim_input();
+		if (ch=='q') exit(0);
+		if (ch==' ') {
+			while(grsim_input()!=' ') usleep(10000);
+		}
+		usleep(10000);
+	}
+
+	goto label150;
+
+	return 0;
+}

gr-sim/sparkle.c

@@ -0,0 +1,107 @@
+/* Based on code from "32 BASIC Programs for the Apple Computer" 	*/
+/*			by Tom Rugg and Phil Feldman			*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "gr-sim.h"
+
+int main(int argc, char **argv) {
+
+	int ch;
+	int j,k;
+	int t;
+	int r,w,c,m,n,l;
+	int x,y;
+
+#define S 19
+	int a[S+1],b[S+1];
+
+	grsim_init();
+
+	// 120
+	gr();
+	// 125
+
+	// 130
+	x=19,y=19;
+
+label140:
+	// 140
+	t=rand()%16;
+
+	// 150
+	for(j=0;j<=S;j++) {
+		a[j]=j;
+		b[j]=j;
+	}
+	// 160+170
+	for(j=0;j<=S;j++) {
+		r=rand()%(S+1);
+		w=a[j];
+		a[j]=a[r];
+		a[r]=w;
+	}
+	// 180+190
+	for(j=0;j<=S;j++) {
+		r=rand()%(S+1);
+		w=b[j];
+		b[j]=b[r];
+		b[r]=w;
+	}
+	// 200
+	for(j=0;j<=S;j++) {
+		for(k=0;k<=S;k++) {
+			// 210
+			r=a[j];
+			w=b[k];
+			c=r+w+t;
+			// 220
+			color_equals(c);
+			// 240
+			if (x+r>40) {
+				printf("ERROR! %d %d\n",x,r);
+				return -1;
+			}
+			plot(x+r,y+w);
+			plot(x+r,y-w);
+			plot(x-r,y-w);
+			plot(x-r,y+w);
+			plot(x+w,y+r);
+			plot(x+w,y-r);
+			plot(x-w,y-r);
+			plot(x-w,y+r);
+			grsim_update();
+	//320
+		}
+	}
+	// 350
+	for(j=1;j<10;j++) {
+		ch=grsim_input();
+		if (ch=='q') exit(0);
+		if (ch==' ') {
+			while(grsim_input()!=' ') usleep(10000);
+		}
+		usleep(10000);
+	}
+
+	// 400
+	m=15;
+	// 405
+	n=(random()%21)+10;
+	// 410
+	for(j=1;j<=n;j++) {
+		r=(random()%22)+1;
+		w=random()%m;
+		color_equals(w);
+		for(l=(y-S);l<=(y+S);l+=(r/4)+1) {
+			for(k=(x-S);k<=(x+S);k+=r) {
+				plot(k,l);
+			}
+		}
+	}
+	goto label140;
+
+	return 0;
+}