/* Allocates an Image structure and initializes the top level fields to appropriate values. Allocates space for an image of the specified size, unless either rows or cols is 0. Returns a pointer to the allocated Image structure. Returns a NULL pointer if the operation fails. */
Image *image_create(int rows, int cols) {
Image *image = NULL;
image = (Image *)malloc( sizeof(Image) );
if (rows > 0 && cols > 0) {
image->data = (FPixel **)malloc( sizeof(FPixel *)*rows );
/* create rows */
for (int i=0; i<rows;i++) {
image->data[i] = (FPixel *)malloc(sizeof(FPixel)*cols);
}
} else {
printf("Rows and columns must both be greater than 0.\n");
image->rows = 0;
image->cols = 0;
image->data = NULL;
return(image);
}
image->rows = rows;
image->cols = cols;
image->imagesize = rows * cols;
image_reset(image);
return(image);
}
void image_modified(image_t *i, image_modified_flags flags)
{
imageobserver_data data;
i->flags |= image_FLAG_MODIFIED;
image_reset(i);
data.modified.flags = flags;
imageobserver_event(i, imageobserver_CHANGE_MODIFIED, &data);
}
void image_destroy(image_t *i)
{
if (i == NULL)
return;
if (--i->refcount <= 0) /* refcount may be zero to start with */
{
imageobserver_event(i, imageobserver_CHANGE_ABOUT_TO_DESTROY, NULL);
list_remove(&list_anchor, &i->list);
if (i->methods.unload)
i->methods.unload(i);
image_reset(i);
free(i);
}
}
/* Allocates space for the image data given rows and columns and initializes the image data to appropriate values, such as 0.0 for RGBA and 1.0 for Z. Returns 0 if the operation is successful. Returns a non-zero value if the operation fails. This function should probably free existing memory if rows and cols are both non-zero. */
int image_alloc(Image *src, int rows, int cols) {
if (src->data != NULL) {
/* free cols in each row */
for (int i=0; i<src->rows;i++) {
free( src->data[i] );
}
/* free rows */
free(src->data);
}
if (rows > 0 && cols > 0) {
src->rows = rows;
src->cols = cols;
src->data = (FPixel **)malloc( sizeof(FPixel *)*rows );
/* create rows */
for (int i=0; i<rows;i++) {
src->data[i] = (FPixel *)malloc(sizeof(FPixel)*cols);
}
src->imagesize = rows*cols;
image_reset(src);
return(0);
} else {
printf("Rows and columns must both be greater than 0.\n");
return(1);
}
}
int main(int argc, char *argv[]) {
int frame;
Color blue, green, purple, red, white;
Point p[16];
BezierSurface bc;
DrawState ds;
Module *curve;
View3D view;
Matrix VTM, GTM;
int divisions = 4;
int rows = 300, cols = 400;
Image *src = image_create(rows, cols);
// grab the command line argument, if one exists
if(argc > 1) {
int tmp = atoi(argv[1]);
if( tmp >= 0 && tmp < 10 )
divisions = tmp;
}
printf("Creating Bezier surface with %d subdivisions\n", divisions);
color_set(&white, 1.0, 1.0, 1.0 );
color_set(&blue, .1, .2, .8);
color_set(&green, .2, 0.7, 0.3 );
color_set(&purple, 0.6, 0.1, 0.7 );
color_set(&red, 0.75, 0.3, 0.3 );
curve = module_create();
// create a flat plane
point_set3D(&p[0], 0.0, -0.2, 0.0); // first row, constant x, even spacing in z
point_set3D(&p[1], 0.0, -0.2, 0.33);
point_set3D(&p[2], 0.0, -0.2, 0.66);
point_set3D(&p[3], 0.0, -0.2, 1.0);
point_set3D(&p[4], 0.33, -0.2, 0.0); // second row
point_set3D(&p[5], 0.33, -0.2, 0.33);
point_set3D(&p[6], 0.33, -0.2, 0.66);
point_set3D(&p[7], 0.33, -0.2, 1.0);
point_set3D(&p[8], 0.66, -0.2, 0.0); // third row
point_set3D(&p[9], 0.66, -0.2, 0.33);
point_set3D(&p[10], 0.66, -0.2, 0.66);
point_set3D(&p[11], 0.66, -0.2, 1.0);
point_set3D(&p[12], 1.0, -0.2, 0.0); // fourth row
point_set3D(&p[13], 1.0, -0.2, 0.33);
point_set3D(&p[14], 1.0, -0.2, 0.66);
point_set3D(&p[15], 1.0, -0.2, 1.0);
bezierSurface_set(&bc, p);
// put the curve into a module
module_color(curve, &red);
module_bezierSurface(curve, &bc, divisions, 0);
// create a curved surface sitting above the plane
point_set3D(&p[0], 0.0, 0.0, 0.0); // first row, constant x, even spacing in z
point_set3D(&p[1], 0.0, 0.2, 0.33);
point_set3D(&p[2], 0.0, 0.5, 0.66);
point_set3D(&p[3], 0.0, 0.1, 1.0);
point_set3D(&p[4], 0.33, 0.8, 0.0); // second row
point_set3D(&p[5], 0.33, -0.1, 0.33);
point_set3D(&p[6], 0.33, 0.0, 0.66);
point_set3D(&p[7], 0.33, 0.3, 1.0);
point_set3D(&p[8], 0.66, 0.3, 0.0); // third row
point_set3D(&p[9], 0.66, 0.8, 0.33);
point_set3D(&p[10], 0.66, 0.9, 0.66);
point_set3D(&p[11], 0.66, 0.5, 1.0);
point_set3D(&p[12], 1.0, 0.4, 0.0); // fourth row
point_set3D(&p[13], 1.0, 0.2, 0.33);
point_set3D(&p[14], 1.0, 0.5, 0.66);
point_set3D(&p[15], 1.0, 1.0, 1.0);
bezierSurface_set(&bc, p);
// put the curve into a module
module_color(curve, &green);
module_bezierSurface(curve, &bc, divisions, 1);
// set up the drawstate
drawstate_setColor(&ds, white);
ds.shade = ShadeFrame;
// set up the view
point_set3D(&(view.vrp), 0.0, 1.2, -3.0 );
vector_set( &(view.vpn), 0.0, -0.8, 2.5 );
vector_set( &(view.vup), 0.0, 1.0, 0.0 );
view.d = 1.5;
view.du = 1.0;
view.dv = 1.0*rows/cols;
view.screeny = rows;
view.screenx = cols;
view.f = 0.0;
view.b = 3.0;
matrix_setView3D( &VTM, &view );
matrix_identity( >M );
// Create the animation by adjusting the GTM
for(frame=0;frame<60;frame++) {
char buffer[256];
matrix_rotateY(>M, cos(M_PI/30.0), sin(M_PI/30.0) );
module_draw( curve, &VTM, >M, &ds, NULL, src );
sprintf(buffer, "bezSurf-frame%03d.ppm", frame);
image_write(src, buffer);
image_reset(src);
}
printf("converting to gif...\n");
system("convert -delay 1.5 -loop 0 bezSurf-frame*.ppm bezSurf.gif");
system("rm bezSurf-frame*.ppm");
// clean up
image_free( src );
module_delete( curve );
return(0);
}
int main(int argc, char *argv[]) {
int i, frame;
Color blue, green, purple, red, white;
Point p[4];
BezierCurve bc;
DrawState ds;
Module *curveA;
Module *curveB;
Module *curves;
View3D view;
Matrix VTM, GTM;
int divisions = 4;
int rows = 300, cols = 400;
Image *src = image_create(rows, cols);
// grab the command line argument, if one exists
if(argc > 1) {
int tmp = atoi(argv[1]);
if( tmp >= 0 && tmp < 10 )
divisions = tmp;
}
printf("Creating Bezier curves with %d subdivisions\n", divisions);
color_set(&white, 1.0, 1.0, 1.0 );
color_set(&blue, .1, .2, .8);
color_set(&green, .2, 0.7, 0.3 );
color_set(&purple, 0.6, 0.1, 0.7 );
color_set(&red, 0.75, 0.3, 0.3 );
// set one curve
point_set3D(&p[0], 0.0, 0.0, 0.0);
point_set3D(&p[1], 1.0, 0.2, 0.0);
point_set3D(&p[2], 0.7, 0.5, 0.2);
point_set3D(&p[3], 1.0, 1.0, 1.0);
bezierCurve_set(&bc, p);
// put the curve into a module
curveA = module_create();
module_color(curveA, &blue);
module_bezierCurve(curveA, &bc, divisions);
// set the second curve
point_set3D(&p[0], 0.0, 0.0, 0.0);
point_set3D(&p[1], 0.0, 0.2, 1.0);
point_set3D(&p[2], 0.2, 0.5, 0.7);
point_set3D(&p[3], 1.0, 1.0, 1.0);
bezierCurve_set(&bc, p);
// put the curve into a module
curveB = module_create();
module_color(curveB, &green);
module_bezierCurve(curveB, &bc, divisions);
// create a module with six curves
curves = module_create();
for(i=0;i<3;i++) {
module_module( curves, curveA );
module_module( curves, curveB );
module_rotateY( curves, cos(2.0*M_PI/3.0), sin(2.0*M_PI/3.0) );
}
// set up the drawstate
drawstate_setColor(&ds, white);
// set up the view
point_set3D(&(view.vrp), 0.0, 0.5, -3.0 );
vector_set( &(view.vpn), 0.0, 0.0, 1.0 );
vector_set( &(view.vup), 0.0, 1.0, 0.0 );
view.d = 1.0;
view.du = 1.0;
view.dv = 1.0*rows/cols;
view.screeny = rows;
view.screenx = cols;
view.f = 0.0;
view.b = 3.0;
matrix_setView3D( &VTM, &view );
matrix_identity( >M );
// Create the animation by adjusting the GTM
for(frame=0;frame<60;frame++) {
char buffer[256];
matrix_rotateY(>M, cos(M_PI/30.0), sin(M_PI/30.0) );
module_draw( curves, &VTM, >M, &ds, NULL, src );
sprintf(buffer, "bez3d-frame%03d.ppm", frame);
image_write(src, buffer);
image_reset(src);
}
printf("converting to gif...\n");
system("convert -delay 1.5 -loop 0 bez3d-frame*.ppm bez3d.gif");
system("rm bez3d-frame*.ppm");
// clean up
image_free( src );
module_delete( curveA );
module_delete( curveB );
module_delete( curves );
return(0);
}
