/*
* engine.c - GL representation of a 4 stroke engine
*
- * version 1.01
+ * version 2.00
*
* Copyright (C) 2001 Ben Buxton (bb@cactii.net)
+ * modified by Ed Beroset (beroset@mindspring.com)
+ * new to 2.0 version is:
+ * - command line argument to specify number of cylinders
+ * - command line argument to specify included angle of engine
+ * - removed broken command line argument to specify rotation speed
+ * - included crankshaft shapes and firing orders for real engines
+ * verified using the Bosch _Automotive Handbook_, 5th edition, pp 402,403
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
# define HACK_INIT init_engine
# define HACK_DRAW draw_engine
# define HACK_HANDLE_EVENT engine_handle_event
-# define HACK_RESHAPE reshape_engine
+# define HACK_RESHAPE reshape_engine
# define EVENT_MASK PointerMotionMask
-# define engine_opts xlockmore_opts
+# define engine_opts xlockmore_opts
/* insert defaults here */
-#define DEFAULTS "*delay: 10000 \n" \
- "*showFPS: False \n" \
- "*move: True \n" \
- "*spin: True \n" \
- "*rotatespeed: 1\n" \
+#define DEF_ENGINE "(none)"
+
+#define DEFAULTS "*delay: 10000 \n" \
+ "*showFPS: False \n" \
+ "*move: True \n" \
+ "*spin: True \n" \
+ "*engine: " DEF_ENGINE "\n" \
# include "xlockmore.h" /* from the xscreensaver distribution */
#else /* !STANDALONE */
#include <GL/glu.h>
-static int rotatespeed;
-static int move;
-static int movepaused = 0;
-static int spin;
+
#undef countof
#define countof(x) (sizeof((x))/sizeof((*x)))
+static int engineType;
+static char *which_engine;
+static int move;
+static int movepaused = 0;
+static int spin;
+
static XrmOptionDescRec opts[] = {
- {"-rotate-speed", ".engine.rotatespeed", XrmoptionSepArg, "1" },
+ {"-engine", ".engine.engine", XrmoptionSepArg, DEF_ENGINE },
{"-move", ".engine.move", XrmoptionNoArg, (caddr_t) "true" },
{"+move", ".engine.move", XrmoptionNoArg, (caddr_t) "false" },
{"-spin", ".engine.spin", XrmoptionNoArg, (caddr_t) "true" },
};
static argtype vars[] = {
- {(caddr_t *) &rotatespeed, "rotatespeed", "Rotatespeed", "1", t_Int},
+ {(caddr_t *) &which_engine, "engine", "Engine", DEF_ENGINE, t_String},
{(caddr_t *) &move, "move", "Move", "True", t_Bool},
{(caddr_t *) &spin, "spin", "Spin", "True", t_Bool},
};
#endif
-
typedef struct {
GLXContext *glx_context;
Window window;
#define M_PI 3.14159265
#endif
+/* these defines are used to provide symbolic means
+ * by which to refer to various portions or multiples
+ * of a cyle in degrees
+ */
+#define HALFREV 180
+#define ONEREV 360
+#define TWOREV 720
+
#define MOVE_MULT 0.05
#define RAND_RANGE(min, max) ((min) + (max - min) * f_rand())
+float crankOffset;
+float crankWidth = 1.5;
+
int win_w, win_h;
static GLfloat viewer[] = {0.0, 0.0, 30.0};
static GLfloat white[] = {1.0, 1, 1, 1.0};
static GLfloat yellow_t[] = {1, 1, 0, 0.4};
-void circle(float, int,int);
GLvoid normal(GLfloat [], GLfloat [], GLfloat [],
GLfloat *, GLfloat *, GLfloat *);
-float sin_table[720];
-float cos_table[720];
-float tan_table[720];
+float sin_table[TWOREV];
+float cos_table[TWOREV];
+float tan_table[TWOREV];
+
+/*
+ * this table represents both the firing order and included angle of engine.
+ * To simplify things, we always number from 0 starting at the flywheel and
+ * moving down the crankshaft toward the back of the engine. This doesn't
+ * always match manufacturer's schemes. For example, the Porsche 911 engine
+ * is a flat six with the following configuration (Porsche's numbering):
+ *
+ * 3 2 1
+ * |= firing order is 1-6-2-4-3-5 in this diagram
+ * 6 5 4
+ *
+ * We renumber these using our scheme but preserve the effective firing order:
+ *
+ * 0 2 4
+ * |= firing order is 4-1-2-5-0-3 in this diagram
+ * 1 3 5
+ *
+ * To avoid going completely insane, we also reorder these so the newly
+ * renumbered cylinder 0 is always first: 0-3-4-1-2-5
+ *
+ * For a flat 6, the included angle is 180 degrees (0 would be a inline engine).
+ * Because these are all four-stroke engines, each piston goes through
+ * 720 degrees of rotation for each time the spark plug sparks, so in this case,
+ * we would use the following angles:
+ * cylinder firing order angle
+ * -------- ------------ -----
+ * 0 0 0
+ * 1 3 360
+ * 2 4 240
+ * 3 1 600
+ * 4 2 480
+ * 5 5 120
+ *
+ */
+
+typedef struct
+{
+ int cylinders;
+ int includedAngle;
+ int pistonAngle[12]; /* twelve cylinders should suffice... */
+ int speed; /* step size in degrees for engine speed */
+ const char *engineName; /* currently unused */
+} engine_type;
+
+engine_type engines[] = {
+ { 3, 0, { 0, 240, 480, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0 }, 12,
+ "Honda Insight" },
+ { 4, 0, { 0, 180, 540, 360, 0, 0,
+ 0, 0, 0, 0, 0, 0 }, 12,
+ "BMW M3" },
+ { 4, 180, { 0, 360, 180, 540, 0, 0,
+ 0, 0, 0, 0, 0, 0 }, 12,
+ "VW Beetle" },
+ { 5, 0, { 0, 576, 144, 432, 288, 0,
+ 0, 0, 0, 0, 0, 0 }, 12,
+ "Audi Quattro" },
+ { 6, 0, { 0, 240, 480, 120, 600, 360,
+ 0, 0, 0, 0, 0, 0 }, 12,
+ "BMW M5" },
+ { 6, 90, { 0, 360, 480, 120, 240, 600,
+ 0, 0, 0, 0, 0, 0 }, 12,
+ "Subaru XT" },
+ { 6, 180, { 0, 360, 240, 600, 480, 120,
+ 0, 0, 0, 0, 0, 0 }, 12,
+ "Porsche 911" },
+ { 8, 90, { 0, 450, 90, 180, 270, 360,
+ 540, 630, 0, 0, 0, 0 }, 15,
+ "Corvette Z06" },
+ {10, 90, { 0, 72, 432, 504, 288, 360,
+ 144, 216, 576, 648, 0, 0 }, 12,
+ "Dodge Viper" },
+ {12, 60, { 0, 300, 240, 540, 480, 60,
+ 120, 420, 600, 180, 360, 660 }, 12,
+ "Jaguar XKE" },
+};
+
+/* this define is just a little shorter way of referring to members of the
+ * table above
+ */
+#define ENG engines[engineType]
+
+/* given a number of cylinders and an included angle, finds matching engine */
+int find_engine(const char *name)
+{
+ int i;
+
+ if (!name || !*name || !strcasecmp (name, "(none)"))
+ return (random() % countof(engines));
+
+ for (i = 0; i < countof(engines); i++) {
+ if (!strcasecmp(name, engines[i].engineName))
+ return i;
+ }
+
+ fprintf (stderr, "%s: unknown engine type \"%s\"\n", progname, name);
+ fprintf (stderr, "%s: available models are:\n", progname);
+ for (i = 0; i < countof(engines); i++) {
+ fprintf (stderr, "\t %-13s (%d cylinders",
+ engines[i].engineName, engines[i].cylinders);
+ if (engines[i].includedAngle == 0)
+ fprintf (stderr, ")\n");
+ else if (engines[i].includedAngle == 180)
+ fprintf (stderr, ", flat)\n");
+ else
+ fprintf (stderr, ", V)\n");
+ }
+ exit(1);
+}
/* we use trig tables to speed things up - 200 calls to sin()
in one frame can be a bit harsh..
int i;
float f;
- f = 360 / (M_PI * 2);
- for (i = 0 ; i <= 720 ; i++) {
+ f = ONEREV / (M_PI * 2);
+ for (i = 0 ; i <= TWOREV ; i++) {
sin_table[i] = sin(i/f);
}
- for (i = 0 ; i <= 720 ; i++) {
+ for (i = 0 ; i <= TWOREV ; i++) {
cos_table[i] = cos(i/f);
}
- for (i = 0 ; i <= 720 ; i++) {
+ for (i = 0 ; i <= TWOREV ; i++) {
tan_table[i] = tan(i/f);
}
}
/* for a tube, endcaps is 0 (none), 1 (left), 2 (right) or 3(both) */
/* angle is how far around the axis to go (up to 360) */
-void cylinder (GLfloat x, GLfloat y, GLfloat z, float length, float outer, float inner, int endcaps, int sang,
- int eang) {
+void cylinder (GLfloat x, GLfloat y, GLfloat z,
+ float length, float outer, float inner, int endcaps, int sang, int eang) {
int a; /* current angle around cylinder */
int b = 0; /* previous */
int angle, norm, step, sangle;
float z1, y1, z2, y2, ex=0;
float y3, z3;
float Z1, Y1, Z2, Y2, xl, Y3, Z3;
-GLfloat y2c[720], z2c[720];
+GLfloat y2c[TWOREV], z2c[TWOREV];
GLfloat ony, onz; /* previous normals */
int nsegs, tube = 0;
Y2 = y;
xl = x + length;
if (inner < outer && endcaps < 3) tube = 1;
- step = 360/nsegs;
+ step = ONEREV/nsegs;
glBegin(GL_QUADS);
for (a = sangle ; a <= angle || b <= angle ; a+= step) {
glNormal3f(0, y2, z2);
glVertex3f(xl,y2,z2);
glVertex3f(x,y2,z2);
- if (a == sangle && angle - sangle < 360) {
+ if (a == sangle && angle - sangle < ONEREV) {
if (tube)
glVertex3f(x, Y1, Z1);
else
}
glEnd();
- if (angle - sangle < 360) {
+ if (angle - sangle < ONEREV) {
GLfloat nx, ny, nz;
GLfloat v1[3], v2[3], v3[3];
v1[0] = x; v1[1] = y; v1[2] = z;
for(ex = start ; ex <= end ; ex += length) {
z1 = outer*cos_table[sangle]+z;
y1 = y+sin_table[sangle]*outer;
- step = 360/nsegs;
+ step = ONEREV/nsegs;
glBegin(GL_TRIANGLES);
b = 0;
for (a = sangle ; a <= angle || b <= angle; a+= step) {
glPopMatrix();
}
+/* this is just a convenience function to make a solid rod */
+void rod (GLfloat x, GLfloat y, GLfloat z, float length, float diameter) {
+ cylinder(x, y, z, length, diameter, diameter, 3, 0, ONEREV);
+}
+
GLvoid normal(GLfloat v1[], GLfloat v2[], GLfloat v3[],
GLfloat *nx, GLfloat *ny, GLfloat *nz)
{
-void circle(float radius, int segments, int half) {
-float x1 = 0, x2 = 0;
-float y1 = 0, y2 = 0;
-int i, t, s;
-
- if (half) {
- t = 270; s = 90;
- x1 = radius, y1 = 0;
- } else {
- t = 360, s = 0;
- }
- glBegin(GL_TRIANGLES);
- glNormal3f(1, 0, 0);
- for(i=s;i<=t;i+=10)
- {
- float angle=i;
- x2=radius*(float)cos_table[(int)angle];
- y2=radius*(float)sin_table[(int)angle];
- glVertex3f(0,0,0);
- glVertex3f(x1,y1,0);
- glVertex3f(x2,y2,0);
- x1=x2;
- y1=y2;
- }
- glEnd();
-}
-
-void ring(GLfloat inner, GLfloat outer, int nsegs) {
-GLfloat z1, z2, y1, y2;
-GLfloat Z1, Z2, Y1, Y2;
-int i;
-
- z1 = inner; y1 = 0;
- Z1 = outer; Y1 = 0;
- glBegin(GL_QUADS);
- glNormal3f(1, 0, 0);
- for(i=0; i <=360 ; i+= 360/nsegs)
- {
- float angle=i;
- z2=inner*(float)sin_table[(int)angle];
- y2=inner*(float)cos_table[(int)angle];
- Z2=outer*(float)sin_table[(int)angle];
- Y2=outer*(float)cos_table[(int)angle];
- glVertex3f(0, Y1, Z1);
- glVertex3f(0, y1, z1);
- glVertex3f(0, y2, z2);
- glVertex3f(0, Y2, Z2);
- z1=z2;
- y1=y2;
- Z1=Z2;
- Y1=Y2;
- }
- glEnd();
-}
-
void Rect(GLfloat x, GLfloat y, GLfloat z, GLfloat w, GLfloat h,
GLfloat t) {
GLfloat yh;
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, colour);
glMaterialfv(GL_FRONT, GL_SPECULAR, colour);
glMateriali(GL_FRONT, GL_SHININESS, 20);
- cylinder(0, 0, 0, 2, 1, 0.7, 2, 0, 360); /* body */
+ cylinder(0, 0, 0, 2, 1, 0.7, 2, 0, ONEREV); /* body */
colour[0] = colour[1] = colour[2] = 0.2;
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, colour);
- cylinder(1.6, 0, 0, 0.1, 1.05, 1.05, 0, 0, 360); /* ring */
- cylinder(1.8, 0, 0, 0.1, 1.05, 1.05, 0, 0, 360); /* ring */
+ cylinder(1.6, 0, 0, 0.1, 1.05, 1.05, 0, 0, ONEREV); /* ring */
+ cylinder(1.8, 0, 0, 0.1, 1.05, 1.05, 0, 0, ONEREV); /* ring */
glEndList();
}
-void CrankBit(GLfloat x, GLfloat y, GLfloat z) {
- Rect(x, y, z, 0.2, 1.8, 1);
+void CrankBit(GLfloat x) {
+ Rect(x, -1.4, 0.5, 0.2, 1.8, 1);
+ cylinder(x, -0.5, 0, 0.2, 2, 2, 1, 60, 120);
}
void boom(GLfloat x, GLfloat y, int s) {
static GLfloat red[] = {0, 0, 0, 0.9};
static GLfloat lpos[] = {0, 0, 0, 1};
static GLfloat d = 0, wd;
+int flameOut = 720/ENG.speed/ENG.cylinders;
static int time = 0;
if (time == 0 && s) {
glEnable(GL_LIGHT1);
} else if (time == 0 && !s) {
return;
- } else if (time >= 8 && time < 16 && !s) {
+ } else if (time >= 8 && time < flameOut && !s) {
time++;
red[0] -= 0.2; red[1] -= 0.1;
d-= 0.04;
- } else if (time >= 16) {
+ } else if (time >= flameOut) {
time = 0;
glDisable(GL_LIGHT1);
return;
d+= 0.04;
time++;
}
- lpos[0] = x; lpos[1] = y-d;
+ lpos[0] = x-d; lpos[1] = y;
glLightfv(GL_LIGHT1, GL_POSITION, lpos);
glLightfv(GL_LIGHT1, GL_DIFFUSE, red);
glLightfv(GL_LIGHT1, GL_SPECULAR, red);
glLighti(GL_LIGHT1, GL_CONSTANT_ATTENUATION, 0);
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
- glPushMatrix();
- glRotatef(90, 0, 0, 1);
wd = d*3;
if (wd > 0.7) wd = 0.7;
glEnable(GL_BLEND);
glDepthMask(GL_FALSE);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- cylinder(y-d, -x, 0, d, wd, wd, 1, 0, 360);
+ rod(x, y, 0, d, wd);
glDepthMask(GL_TRUE);
glDisable(GL_BLEND);
- glPopMatrix();
}
void display(Engine *e) {
GLfloat zb, yb;
static GLfloat ln[730], yp[730], ang[730];
static int ln_init = 0;
-static int spark;
+static int lastPlug = 0;
+int half;
+int sides;
+int j, b;
+static float rightSide;
glEnable(GL_LIGHTING);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
- gluLookAt(viewer[0], viewer[1], viewer[2], lookat[0], lookat[1], lookat[2], 0.0, 1.0, 0.0);
+ gluLookAt(viewer[0], viewer[1], viewer[2], lookat[0], lookat[1], lookat[2],
+ 0.0, 1.0, 0.0);
glPushMatrix();
glLightfv(GL_LIGHT0, GL_POSITION, lightpos);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_sp);
double x, y, z;
gltrackball_rotate (e->trackball);
get_rotation(e->rot, &x, &y, &z, !e->button_down_p);
- glRotatef(x*360, 1.0, 0.0, 0.0);
- glRotatef(y*360, 0.0, 1.0, 0.0);
- glRotatef(x*360, 0.0, 0.0, 1.0);
+ glRotatef(x*ONEREV, 1.0, 0.0, 0.0);
+ glRotatef(y*ONEREV, 0.0, 1.0, 0.0);
+ glRotatef(x*ONEREV, 0.0, 0.0, 1.0);
}
/* So the rotation appears around the centre of the engine */
for (ln_init = 0 ; ln_init < 730 ; ln_init++) {
zb = sin_table[ln_init];
yb = cos_table[ln_init];
- yp[ln_init] = yb + sqrt(25 - (zb*zb)); /* y ordinate of piston */
- ln[ln_init] = sqrt(zb*zb + (yb-yp[ln_init])*(yb-yp[ln_init])); /* length of rod */
- ang[ln_init] = asin(zb/5)*57; /* angle of connecting rod */
+ /* y ordinate of piston */
+ yp[ln_init] = yb + sqrt(25 - (zb*zb));
+ /* length of rod */
+ ln[ln_init] = sqrt(zb*zb + (yb-yp[ln_init])*(yb-yp[ln_init]));
+ /* angle of connecting rod */
+ ang[ln_init] = asin(zb/5)*57;
ang[ln_init] *= -1;
}
}
- zb = sin_table[a];
- yb = cos_table[a];
-
-/* pistons */
- glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white);
- glPushMatrix();
- glTranslatef(0, yp[a]-0.3, 0);
- glCallList(2);
- glPopMatrix();
- glPushMatrix();
- glTranslatef(3.2, yp[(a > 180 ? a-180 : a+180)]-0.3, 0);
- glCallList(2);
- glPopMatrix();
- glPushMatrix();
- glTranslatef(6.5, yp[a]-0.3, 0);
- glCallList(2);
- glPopMatrix();
glPushMatrix();
- glTranslatef(9.8, yp[(a > 180 ? a-180 : a+180)]-0.3, 0);
- glCallList(2);
- glPopMatrix();
-
-/* spark plugs */
- glPushMatrix();
- glRotatef(90, 0, 0, 1);
- glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
- cylinder(8.5, 0, 0, 0.5, 0.4, 0.3, 1, 0, 360);
- cylinder(8.5, -3.2, 0, 0.5, 0.4, 0.3, 1, 0, 360);
- cylinder(8.5, -6.5, 0, 0.5, 0.4, 0.3, 1, 0, 360);
- cylinder(8.5, -9.8, 0, 0.5, 0.4, 0.3, 1, 0, 360);
-
- glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white);
- cylinder(8, 0, 0, 0.5, 0.2, 0.2, 1, 0, 360);
- cylinder(8, -3.2, 0, 0.5, 0.2, 0.2, 1, 0, 360);
- cylinder(8, -6.5, 0, 0.5, 0.2, 0.2, 1, 0, 360);
- cylinder(8, -9.8, 0, 0.5, 0.2, 0.2, 1, 0, 360);
-
- glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white);
- cylinder(9, 0, 0, 1, 0.15, 0.15, 1, 0, 360);
- cylinder(9, -3.2, 0, 1, 0.15, 0.15, 1, 0, 360);
- cylinder(9, -6.5, 0, 1, 0.15, 0.15, 1, 0, 360);
- cylinder(9, -9.8, 0, 1, 0.15, 0.15, 1, 0, 360);
-
- glPopMatrix();
-
- if (a == 0) spark = 1 - spark;
-
- if (spark == 0) {
- if (a == 0)
- boom(0, 8, 1);
- else if (a == 180)
- boom(3.2, 8, 1);
- if (a < 180)
- boom(0, 8, 0);
- else if (a < 360)
- boom(3.2, 8, 0);
- } else {
- if (a == 0)
- boom(6.5, 8, 1);
- else if (a == 180)
- boom(9.8, 8, 1);
- if (a < 180)
- boom(6.5, 8, 0);
- else if (a < 360)
- boom(9.8, 8, 0);
+ sides = (ENG.includedAngle == 0) ? 1 : 2;
+ for (half = 0; half < sides; half++, glRotatef(ENG.includedAngle,1,0,0))
+ {
+ /* pistons */
+ /* glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white); */
+ for (j = 0; j < ENG.cylinders; j += sides)
+ {
+ b = (a + ENG.pistonAngle[j+half]) % ONEREV;
+ glPushMatrix();
+ glTranslatef(crankWidth/2 + crankOffset*(j+half), yp[b]-0.3, 0);
+ glCallList(2);
+ glPopMatrix();
+ }
+ /* spark plugs */
+ glPushMatrix();
+ glRotatef(90, 0, 0, 1);
+ glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
+ for (j = 0; j < ENG.cylinders; j += sides)
+ {
+ cylinder(8.5, -crankWidth/2-crankOffset*(j+half), 0,
+ 0.5, 0.4, 0.3, 1, 0, ONEREV);
+ }
+ glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white);
+ for (j = 0; j < ENG.cylinders; j += sides)
+ {
+ rod(8, -crankWidth/2-crankOffset*(j+half), 0, 0.5, 0.2);
+ rod(9, -crankWidth/2-crankOffset*(j+half), 0, 1, 0.15);
+ }
+
+ /* rod */
+ glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
+ for (j = 0; j < ENG.cylinders; j += sides)
+ {
+ b = (a+HALFREV+ENG.pistonAngle[j+half]) % TWOREV;
+ glPushMatrix();
+ glRotatef(ang[b], 0, 1, 0);
+ rod(-cos_table[b], -crankWidth/2-crankOffset*(j+half), -sin_table[b],
+ ln[b], 0.2);
+ glPopMatrix();
+ }
+ glPopMatrix();
+
+ /* engine block */
+ glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, yellow_t);
+ glEnable(GL_BLEND);
+ glDepthMask(GL_FALSE);
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ rightSide = (sides > 1) ? 0 : 1.6;
+ /* left plate */
+ Rect(-crankWidth/2, -0.5, 1, 0.2, 9, 2);
+ /* right plate */
+ Rect(0.3+crankOffset*ENG.cylinders-rightSide, -0.5, 1, 0.2, 9, 2);
+ /* head plate */
+ Rect(-crankWidth/2+0.2, 8.3, 1,
+ crankWidth/2+0.1+crankOffset*ENG.cylinders-rightSide, 0.2, 2);
+ /* front rail */
+ Rect(-crankWidth/2+0.2, 3, 1,
+ crankWidth/2+0.1+crankOffset*ENG.cylinders-rightSide, 0.2, 0.2);
+ /* back rail */
+ Rect(-crankWidth/2+0.2, 3, -1+0.2,
+ crankWidth/2+0.1+crankOffset*ENG.cylinders-rightSide, 0.2, 0.2);
+ /* plates between cylinders */
+ for (j=0; j < ENG.cylinders - (sides == 1); j += sides)
+ Rect(0.4+crankWidth+crankOffset*(j-half), 3, 1, 1, 5.3, 2);
+ glDepthMask(GL_TRUE);
}
-
-
-
- glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
- glPushMatrix();
- cylinder(-0.8, yb, zb, 1.6, 0.3, 0.3, 1, 0, 365);
- cylinder(5.7, yb, zb, 1.7, 0.3, 0.3, 1, 0, 365);
-
- cylinder(2.4, -yb, -zb, 1.7, 0.3, 0.3, 1, 0, 365);
- cylinder(9.0, -yb, -zb, 1.7, 0.3, 0.3, 1, 0, 365);
- glPopMatrix();
-
- /* rod */
- glPushMatrix();
- glRotatef(90, 0, 0, 1);
- glRotatef(ang[a], 0, -1, 0);
- cylinder(yb, 0, zb, ln[a], 0.2, 0.2, 0, 0, 365);
- cylinder(yb, -6.4, zb, ln[a], 0.2, 0.2, 0, 0, 365);
- glPopMatrix();
-
- glPushMatrix();
- glRotatef(90, 0, 0, 1);
- glRotatef(ang[a+180], 0, -1, 0);
- cylinder(-yb, -3.2, -zb, ln[a], 0.2, 0.2, 0, 0, 365);
- cylinder(-yb, -9.7, -zb, ln[a], 0.2, 0.2, 0, 0, 365);
glPopMatrix();
+ /* see which of our plugs should fire now, if any */
+ for (j = 0; j < ENG.cylinders; j++)
+ {
+ if (0 == ((a + ENG.pistonAngle[j]) % TWOREV))
+ {
+ glPushMatrix();
+ if (j & 1)
+ glRotatef(ENG.includedAngle,1,0,0);
+ glRotatef(90, 0, 0, 1);
+ boom(8, -crankWidth/2-crankOffset*j, 1);
+ lastPlug = j;
+ glPopMatrix();
+ }
+ }
- glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, yellow_t);
- glEnable(GL_BLEND);
- glDepthMask(GL_FALSE);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-
- Rect(-1, 8.3, 1, 12, 0.2, 2);
- Rect(-1.2, -0.5, 1, 0.2, 9, 2);
-
- Rect(1.4, 3, 1, 0.6, 5.3, 2);
- Rect(4.4, 3, 1, 1, 5.3, 2);
- Rect(7.7, 3, 1, 0.8, 5.3, 2);
- Rect(10.8, -0.5, 1, 0.2, 8.8, 2);
-
- Rect(-1, 2.8, 1, 12, 0.2, 0.2);
- Rect(-1, 2.8, -1, 12, 0.2, 0.2);
-
- glDepthMask(GL_TRUE);
+ if (lastPlug != j)
+ {
+ /* this code causes the last plug explosion to dim gradually */
+ if (lastPlug & 1)
+ glRotatef(ENG.includedAngle, 1, 0, 0);
+ glRotatef(90, 0, 0, 1);
+ boom(8, -crankWidth/2-crankOffset*lastPlug, 0);
+ }
glDisable(GL_BLEND);
-
- a+=10; if (a >= 360) a = 0;
+ a += ENG.speed;
+ if (a >= TWOREV)
+ a = 0;
glPopMatrix();
glFlush();
}
void makeshaft (void) {
int i;
+int j;
+const static float crankThick = 0.2;
+const static float crankDiam = 0.3;
+
i = glGenLists(1);
glNewList(i, GL_COMPILE);
- cylinder(10.4, 0, 0, 2, 0.3, 0.3, 1, 0, 365);
- cylinder(7.1, 0, 0, 2, 0.3, 0.3, 0, 0, 365);
- cylinder(3.8, 0, 0, 2, 0.3, 0.3, 0, 0, 365);
- cylinder(0.5, 0, 0, 2, 0.3, 0.3, 0, 0, 365);
- cylinder(-1.5, 0, 0, 1, 0.3, 0.3, 1, 0, 365);
-
- cylinder(12.4, 0, 0, 1, 3, 2.5, 0, 0, 365);
- Rect(12.4, -0.3, 2.8, 0.5, 0.6, 5.6);
- Rect(12.4, -2.8, 0.3, 0.5, 5.6, 0.6);
-
- glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
- CrankBit(0.5, -0.4, 0.5);
- cylinder(0.5, 0.5, 0, 0.2, 2, 2, 1, 240, 300);
- CrankBit(-0.7, -0.4, 0.5);
- cylinder(-0.7, 0.5, 0, 0.2, 2, 2, 1, 240, 300);
-
- CrankBit(2.5, -1.4, 0.5);
- cylinder(2.5, -0.5, 0, 0.2, 2, 2, 1, 60, 120);
- CrankBit(3.8, -1.4, 0.5);
- cylinder(3.8, -0.5, 0, 0.2, 2, 2, 1, 60, 120);
-
- CrankBit(5.8, -0.4, 0.5);
- cylinder(5.8, 0.5, 0, 0.2, 2, 2, 1, 240, 300);
- CrankBit(7.1, -0.4, 0.5);
- cylinder(7.1, 0.5, 0, 0.2, 2, 2, 1, 240, 300);
-
- CrankBit(9.1, -1.4, 0.5);
- cylinder(9.1, -0.5, 0, 0.2, 2, 2, 1, 60, 120);
- CrankBit(10.4, -1.4, 0.5);
- cylinder(10.4, -0.5, 0, 0.2, 2, 2, 1, 60, 120);
+ glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
+ /* draw the flywheel */
+ cylinder(-2.5, 0, 0, 1, 3, 2.5, 0, 0, ONEREV);
+ Rect(-2, -0.3, 2.8, 0.5, 0.6, 5.6);
+ Rect(-2, -2.8, 0.3, 0.5, 5.6, 0.6);
+
+ /* now make each of the shaft bits between the cranks,
+ * starting from the flywheel end which is at X-coord 0.
+ * the first cranskhaft bit is always 2 units long
+ */
+ rod(-2, 0, 0, 2, crankDiam);
+
+ /* Each crank is crankWidth units wide and the total width of a cylinder assembly
+ * is 3.3 units. For inline engines, there is just a single crank per cylinder
+ * width. For other engine configurations, there is a crank between each pair
+ * of adjacent cylinders on one side of the engine, so the crankOffset length is
+ * halved.
+ */
+ crankOffset = 3.3;
+ if (ENG.includedAngle != 0)
+ crankOffset /= 2;
+ for (j = 0; j < ENG.cylinders - 1; j++)
+ rod(crankWidth - crankThick + crankOffset*j, 0, 0,
+ crankOffset - crankWidth + 2 * crankThick, crankDiam);
+ /* the last bit connects to the engine wall on the non-flywheel end */
+ rod(crankWidth - crankThick + crankOffset*j, 0, 0, 0.9, crankDiam);
+
+
+ for (j = 0; j < ENG.cylinders; j++)
+ {
+ glPushMatrix();
+ if (j & 1)
+ glRotatef(HALFREV+ENG.pistonAngle[j]+ENG.includedAngle,1,0,0);
+ else
+ glRotatef(HALFREV+ENG.pistonAngle[j],1,0,0);
+ /* draw wrist pin */
+ glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
+ rod(crankOffset*j, -1.0, 0.0, crankWidth, crankDiam);
+ glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
+ /* draw right part of crank */
+ CrankBit(crankOffset*j);
+ /* draw left part of crank */
+ CrankBit(crankWidth-crankThick+crankOffset*j);
+ glPopMatrix();
+ }
glEndList();
-
}
void reshape_engine(ModeInfo *mi, int width, int height)
e->dy = (float)(random() % 1000)/30000;
e->dz = (float)(random() % 1000)/30000;
} else {
- viewer[0] = 0; viewer[1] = 6; viewer[2] = 15;
- lookat[0] = 0; lookat[1] = 4; lookat[2] = 0;
+ viewer[0] = 0; viewer[1] = 2; viewer[2] = 18;
+ lookat[0] = 0; lookat[1] = 0; lookat[2] = 0;
+
}
if (spin) {
e->da = (float)(random() % 1000)/125 - 4;
glEnable(GL_LIGHT0);
glEnable(GL_NORMALIZE);
make_tables();
+ engineType = find_engine(which_engine);
makeshaft();
makepiston();
}
projects / xscreensaver / blobdiff