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-rw-r--r--instructables/cube_pc/draw.c682
1 files changed, 682 insertions, 0 deletions
diff --git a/instructables/cube_pc/draw.c b/instructables/cube_pc/draw.c
new file mode 100644
index 0000000..549d109
--- /dev/null
+++ b/instructables/cube_pc/draw.c
@@ -0,0 +1,682 @@
+#include "draw.h"
+#include "draw_3d.h"
+#include <string.h>
+
+
+void setvoxel(int x, int y, int z)
+{
+ if (inrange(x,y,z))
+ cube[y][z] |= (1 << x);
+
+}
+
+void tmpsetvoxel(int x, int y, int z)
+{
+ if (inrange(x,y,z))
+ fb[y][z] |= (1 << x);
+}
+
+void clrvoxel(int x, int y, int z)
+{
+ if (inrange(x,y,z))
+ cube[y][z] &= ~(1 << x);
+}
+
+void tmpclrvoxel(int x, int y, int z)
+{
+ if (inrange(x,y,z))
+ fb[y][z] &= ~(1 << x);
+}
+
+// This function validates that we are drawing inside the cube.
+unsigned char inrange(int x, int y, int z)
+{
+ if (x >= 0 && x < 8 && y >= 0 && y < 8 && z >= 0 && z < 8)
+ {
+ return 0x01;
+ } else
+ {
+ // One of the coordinates was outside the cube.
+ return 0x00;
+ }
+}
+
+// Get the current status of a voxel
+unsigned char getvoxel(int x, int y, int z)
+{
+ if (inrange(x,y,z))
+ {
+ if (cube[y][z] & (1 << x))
+ {
+ return 0x01;
+ } else
+ {
+ return 0x00;
+ }
+ } else
+ {
+ return 0x00;
+ }
+}
+
+void altervoxel(int x, int y, int z, int state)
+{
+ if (state == 1)
+ {
+ setvoxel(x,y,z);
+ } else
+ {
+ clrvoxel(x,y,z);
+ }
+}
+
+// Flip the state of a voxel.
+// If the voxel is 1, its turned into a 0, and vice versa.
+void flpvoxel(int x, int y, int z)
+{
+ if (inrange(x, y, z))
+ cube[y][z] ^= (1 << x);
+}
+
+// Makes sure x1 is alwas smaller than x2
+void argorder(int ix1, int ix2, int *ox1, int *ox2)
+{
+ if (ix1>ix2)
+ {
+ int tmp;
+ tmp = ix1;
+ ix1= ix2;
+ ix2 = tmp;
+ }
+ *ox1 = ix1;
+ *ox2 = ix2;
+}
+
+void setplane_z (int z)
+{
+ int i;
+ if (z>=0 && z<8)
+ {
+ for (i=0;i<8;i++)
+ cube[i][z] = 0xff;
+ }
+}
+
+
+void clrplane_z (int z)
+{
+ int i;
+ if (z>=0 && z<8)
+ {
+ for (i=0;i<8;i++)
+ cube[i][z] = 0x00;
+ }
+}
+
+void setplane_x (int x)
+{
+ int z;
+ int y;
+ if (x>=0 && x<8)
+ {
+ for (z=0;z<8;z++)
+ {
+ for (y=0;y<8;y++)
+ {
+ cube[y][z] |= (1 << x);
+ }
+ }
+ }
+}
+
+void clrplane_x (int x)
+{
+ int z;
+ int y;
+ if (x>=0 && x<8)
+ {
+ for (z=0;z<8;z++)
+ {
+ for (y=0;y<8;y++)
+ {
+ cube[y][z] &= ~(1 << x);
+ }
+ }
+ }
+}
+
+void setplane_y (int y)
+{
+ int z;
+ if (y>=0 && y<8)
+ {
+ for (z=0;z<8;z++)
+ cube[y][z] = 0xff;
+ }
+}
+
+void clrplane_y (int y)
+{
+ int z;
+ if (y>=0 && y<8)
+ {
+ for (z=0;z<8;z++)
+ cube[y][z] = 0x00;
+ }
+}
+
+
+void fill (unsigned char pattern)
+{
+ int z;
+ int y;
+ for (z=0;z<8;z++)
+ {
+ for (y=0;y<8;y++)
+ {
+ cube[y][z] = pattern;
+ }
+ }
+}
+
+void tmpfill (unsigned char pattern)
+{
+ int z;
+ int y;
+ for (z=0;z<8;z++)
+ {
+ for (y=0;y<8;y++)
+ {
+ fb[z][y] = pattern;
+ }
+ }
+}
+
+
+void box_filled(int x1, int y1, int z1, int x2, int y2, int z2)
+{
+ int iy;
+ int iz;
+
+ argorder(x1, x2, &x1, &x2);
+ argorder(y1, y2, &y1, &y2);
+ argorder(z1, z2, &z1, &z2);
+
+ for (iz=z1;iz<=z2;iz++)
+ {
+ for (iy=y1;iy<=y2;iy++)
+ {
+ cube[iy][iz] |= byteline(x1,x2);
+ }
+ }
+
+}
+
+void box_walls(int x1, int y1, int z1, int x2, int y2, int z2)
+{
+ int iy;
+ int iz;
+
+ argorder(x1, x2, &x1, &x2);
+ argorder(y1, y2, &y1, &y2);
+ argorder(z1, z2, &z1, &z2);
+
+ for (iz=z1;iz<=z2;iz++)
+ {
+ for (iy=y1;iy<=y2;iy++)
+ {
+ if (iy == y1 || iy == y2 || iz == z1 || iz == z2)
+ {
+ cube[iy][iz] = byteline(x1,x2);
+ } else
+ {
+ cube[iy][iz] |= ((0x01 << x1) | (0x01 << x2));
+ }
+ }
+ }
+
+}
+
+
+void box_wireframe(int x1, int y1, int z1, int x2, int y2, int z2)
+{
+ int iy;
+ int iz;
+
+ argorder(x1, x2, &x1, &x2);
+ argorder(y1, y2, &y1, &y2);
+ argorder(z1, z2, &z1, &z2);
+
+ // Lines along X axis
+ cube[y1][z1] = byteline(x1,x2);
+ cube[y1][z2] = byteline(x1,x2);
+ cube[y2][z1] = byteline(x1,x2);
+ cube[y2][z2] = byteline(x1,x2);
+
+ // Lines along Y axis
+ for (iy=y1;iy<=y2;iy++)
+ {
+ setvoxel(x1,iy,z1);
+ setvoxel(x1,iy,z2);
+ setvoxel(x2,iy,z1);
+ setvoxel(x2,iy,z2);
+ }
+
+ // Lines along Z axis
+ for (iz=z1;iz<=z2;iz++)
+ {
+ setvoxel(x1,y1,iz);
+ setvoxel(x1,y2,iz);
+ setvoxel(x2,y1,iz);
+ setvoxel(x2,y2,iz);
+ }
+
+}
+
+// Returns a byte with a row of 1's drawn in it.
+// byteline(2,5) gives 0b00111100
+char byteline (int start, int end)
+{
+ return ((0xff<<start) & ~(0xff<<(end+1)));
+}
+
+char flipbyte (char byte)
+{
+ char flop = 0x00;
+
+ flop = (flop & 0b11111110) | (0b00000001 & (byte >> 7));
+ flop = (flop & 0b11111101) | (0b00000010 & (byte >> 5));
+ flop = (flop & 0b11111011) | (0b00000100 & (byte >> 3));
+ flop = (flop & 0b11110111) | (0b00001000 & (byte >> 1));
+ flop = (flop & 0b11101111) | (0b00010000 & (byte << 1));
+ flop = (flop & 0b11011111) | (0b00100000 & (byte << 3));
+ flop = (flop & 0b10111111) | (0b01000000 & (byte << 5));
+ flop = (flop & 0b01111111) | (0b10000000 & (byte << 7));
+ return flop;
+}
+
+void line(int x1, int y1, int z1, int x2, int y2, int z2)
+{
+ float xy; // how many voxels do we move on the y axis for each step on the x axis
+ float xz; // how many voxels do we move on the y axis for each step on the x axis
+ unsigned char x,y,z;
+ unsigned char lasty,lastz;
+
+ // We always want to draw the line from x=0 to x=7.
+ // If x1 is bigget than x2, we need to flip all the values.
+ if (x1>x2)
+ {
+ int tmp;
+ tmp = x2; x2 = x1; x1 = tmp;
+ tmp = y2; y2 = y1; y1 = tmp;
+ tmp = z2; z2 = z1; z1 = tmp;
+ }
+
+
+ if (y1>y2)
+ {
+ xy = (float)(y1-y2)/(float)(x2-x1);
+ lasty = y2;
+ } else
+ {
+ xy = (float)(y2-y1)/(float)(x2-x1);
+ lasty = y1;
+ }
+
+ if (z1>z2)
+ {
+ xz = (float)(z1-z2)/(float)(x2-x1);
+ lastz = z2;
+ } else
+ {
+ xz = (float)(z2-z1)/(float)(x2-x1);
+ lastz = z1;
+ }
+
+
+
+ for (x = x1; x<=x2;x++)
+ {
+ y = (xy*(x-x1))+y1;
+ z = (xz*(x-x1))+z1;
+ setvoxel(x,y,z);
+ }
+
+}
+
+void delay_ms(int x)
+{
+ memcpy(rs232_cube, cube, 64);
+ usleep(x*80);
+}
+
+// Copies the contents of fb (temp cube buffer) into the rendering buffer
+void tmp2cube (void)
+{
+ int y, z;
+ for (z=0;z<8;z++)
+ {
+ for (y=0;y<8;y++)
+ {
+ cube[y][z] = fb[y][z];
+ }
+ }
+}
+
+void shift (char axis, int direction)
+{
+ int i, x ,y;
+ int ii, iii;
+ int state;
+
+ for (i = 0; i < 8; i++)
+ {
+ if (direction == -1)
+ {
+ ii = i;
+ } else
+ {
+ ii = (7-i);
+ }
+
+
+ for (x = 0; x < 8; x++)
+ {
+ for (y = 0; y < 8; y++)
+ {
+ if (direction == -1)
+ {
+ iii = ii+1;
+ } else
+ {
+ iii = ii-1;
+ }
+
+ if (axis == AXIS_Z)
+ {
+ state = getvoxel(x,y,iii);
+ altervoxel(x,y,ii,state);
+ }
+
+ if (axis == AXIS_Y)
+ {
+ state = getvoxel(x,iii,y);
+ altervoxel(x,ii,y,state);
+ }
+
+ if (axis == AXIS_X)
+ {
+ state = getvoxel(iii,y,x);
+ altervoxel(ii,x,y,state);
+ }
+ }
+ }
+ }
+
+ if (direction == -1)
+ {
+ i = 7;
+ } else
+ {
+ i = 0;
+ }
+
+ for (x = 0; x < 8; x++)
+ {
+ for (y = 0; y < 8; y++)
+ {
+ if (axis == AXIS_Z)
+ clrvoxel(x,y,i);
+
+ if (axis == AXIS_Y)
+ clrvoxel(x,i,y);
+
+ if (axis == AXIS_X)
+ clrvoxel(i,y,x);
+ }
+ }
+}
+
+
+
+void line_3d (int x1, int y1, int z1, int x2, int y2, int z2)
+{
+ int i, dx, dy, dz, l, m, n, x_inc, y_inc, z_inc,
+ err_1, err_2, dx2, dy2, dz2;
+ int pixel[3];
+ pixel[0] = x1;
+ pixel[1] = y1;
+ pixel[2] = z1;
+ dx = x2 - x1;
+ dy = y2 - y1;
+ dz = z2 - z1;
+ x_inc = (dx < 0) ? -1 : 1;
+ l = abs(dx);
+ y_inc = (dy < 0) ? -1 : 1;
+ m = abs(dy);
+ z_inc = (dz < 0) ? -1 : 1;
+ n = abs(dz);
+ dx2 = l << 1;
+ dy2 = m << 1;
+ dz2 = n << 1;
+ if ((l >= m) && (l >= n)) {
+ err_1 = dy2 - l;
+ err_2 = dz2 - l;
+ for (i = 0; i < l; i++) {
+ //PUT_PIXEL(pixel);
+ setvoxel(pixel[0],pixel[1],pixel[2]);
+ //printf("Setting %i %i %i \n", pixel[0],pixel[1],pixel[2]);
+ if (err_1 > 0) {
+ pixel[1] += y_inc;
+ err_1 -= dx2;
+ }
+ if (err_2 > 0) {
+ pixel[2] += z_inc;
+ err_2 -= dx2;
+ }
+ err_1 += dy2;
+ err_2 += dz2;
+ pixel[0] += x_inc;
+ }
+ } else if ((m >= l) && (m >= n)) {
+ err_1 = dx2 - m;
+ err_2 = dz2 - m;
+ for (i = 0; i < m; i++) {
+ //PUT_PIXEL(pixel);
+ setvoxel(pixel[0],pixel[1],pixel[2]);
+ //printf("Setting %i %i %i \n", pixel[0],pixel[1],pixel[2]);
+ if (err_1 > 0) {
+ pixel[0] += x_inc;
+ err_1 -= dy2;
+ }
+ if (err_2 > 0) {
+ pixel[2] += z_inc;
+ err_2 -= dy2;
+ }
+ err_1 += dx2;
+ err_2 += dz2;
+ pixel[1] += y_inc;
+ }
+ } else {
+ err_1 = dy2 - n;
+ err_2 = dx2 - n;
+ for (i = 0; i < n; i++) {
+ setvoxel(pixel[0],pixel[1],pixel[2]);
+ //printf("Setting %i %i %i \n", pixel[0],pixel[1],pixel[2]);
+ //PUT_PIXEL(pixel);
+ if (err_1 > 0) {
+ pixel[1] += y_inc;
+ err_1 -= dz2;
+ }
+ if (err_2 > 0) {
+ pixel[0] += x_inc;
+ err_2 -= dz2;
+ }
+ err_1 += dy2;
+ err_2 += dx2;
+ pixel[2] += z_inc;
+ }
+ }
+ setvoxel(pixel[0],pixel[1],pixel[2]);
+ //printf("Setting %i %i %i \n", pixel[0],pixel[1],pixel[2]);
+ //PUT_PIXEL(pixel);
+}
+
+
+void line_3d_float (vertex point1, vertex point2)
+{
+ float x1, y1, z1, x2, y2, z2;
+
+ x1 = point1.x;
+ y1 = point1.y;
+ z1 = point1.z;
+ x2 = point2.x;
+ y2 = point2.y;
+ z2 = point2.z;
+
+
+ float i;
+ float dx, dy, dz, l, m, n, x_inc, y_inc, z_inc,
+ err_1, err_2, dx2, dy2, dz2;
+ float pixel[3];
+ pixel[0] = x1;
+ pixel[1] = y1;
+ pixel[2] = z1;
+ dx = x2 - x1;
+ dy = y2 - y1;
+ dz = z2 - z1;
+ x_inc = (dx < 0) ? -1 : 1;
+ l = abs(dx);
+ y_inc = (dy < 0) ? -1 : 1;
+ m = abs(dy);
+ z_inc = (dz < 0) ? -1 : 1;
+ n = abs(dz);
+ dx2 = l*l;
+ dy2 = m*m;
+ dz2 = n*n;
+ if ((l >= m) && (l >= n)) {
+ err_1 = dy2 - l;
+ err_2 = dz2 - l;
+ for (i = 0; i < l; i++) {
+ //PUT_PIXEL(pixel);
+ setvoxel((int)pixel[0],(int)pixel[1],(int)pixel[2]);
+ //printf("Setting %i %i %i \n", pixel[0],pixel[1],pixel[2]);
+ if (err_1 > 0) {
+ pixel[1] += y_inc;
+ err_1 -= dx2;
+ }
+ if (err_2 > 0) {
+ pixel[2] += z_inc;
+ err_2 -= dx2;
+ }
+ err_1 += dy2;
+ err_2 += dz2;
+ pixel[0] += x_inc;
+ }
+ } else if ((m >= l) && (m >= n)) {
+ err_1 = dx2 - m;
+ err_2 = dz2 - m;
+ for (i = 0; i < m; i++) {
+ //PUT_PIXEL(pixel);
+ //setvoxel(pixel[0]/scale,pixel[1]/scale,pixel[2]/scale);
+ setvoxel((int)pixel[0],(int)pixel[1],(int)pixel[2]);
+ //printf("Setting %i %i %i \n", pixel[0],pixel[1],pixel[2]);
+ if (err_1 > 0) {
+ pixel[0] += x_inc;
+ err_1 -= dy2;
+ }
+ if (err_2 > 0) {
+ pixel[2] += z_inc;
+ err_2 -= dy2;
+ }
+ err_1 += dx2;
+ err_2 += dz2;
+ pixel[1] += y_inc;
+ }
+ } else {
+ err_1 = dy2 - n;
+ err_2 = dx2 - n;
+ for (i = 0; i < n; i++) {
+ //setvoxel(pixel[0]/scale,pixel[1]/scale,pixel[2]/scale);
+ setvoxel((int)pixel[0],(int)pixel[1],(int)pixel[2]);
+ //printf("Setting %i %i %i \n", pixel[0],pixel[1],pixel[2]);
+ //PUT_PIXEL(pixel);
+ if (err_1 > 0) {
+ pixel[1] += y_inc;
+ err_1 -= dz2;
+ }
+ if (err_2 > 0) {
+ pixel[0] += x_inc;
+ err_2 -= dz2;
+ }
+ err_1 += dy2;
+ err_2 += dx2;
+ pixel[2] += z_inc;
+ }
+ }
+ //setvoxel(pixel[0]/scale,pixel[1]/scale,pixel[2]/scale);
+ setvoxel((int)pixel[0],(int)pixel[1],(int)pixel[2]);
+ //printf("Setting %i %i %i \n", pixel[0],pixel[1],pixel[2]);
+ //PUT_PIXEL(pixel);
+}
+
+// Flip the cube 180 degrees along the x axis
+void mirror_x (void)
+{
+ unsigned char buffer[8][8];
+ unsigned char y,z;
+
+ memcpy(buffer, cube, 64); // copy the current cube into a buffer.
+
+ fill(0x00);
+
+ for (z=0; z<8; z++)
+ {
+ for (y=0; y<8; y++)
+ {
+ cube[y][z] = flipbyte(buffer[y][z]);
+ }
+ }
+}
+// Flip the cube 180 degrees along the y axis.
+void mirror_y (void)
+{
+ unsigned char buffer[8][8];
+ unsigned char x,y,z;
+
+ memcpy(buffer, cube, 64); // copy the current cube into a buffer.
+
+ fill(0x00);
+ for (z=0; z<8; z++)
+ {
+ for (y=0; y<8; y++)
+ {
+ for (x=0; x<8; x++)
+ {
+ if (buffer[y][z] & (0x01 << x))
+ setvoxel(x,7-y,z);
+ }
+ }
+ }
+
+}
+// flip the cube 180 degrees along the z axis
+void mirror_z (void)
+{
+ unsigned char buffer[8][8];
+ unsigned char z, y;
+
+ memcpy(buffer, cube, 64); // copy the current cube into a buffer.
+
+ for (y=0; y<8; y++)
+ {
+ for (z=0; z<8; z++)
+ {
+ cube[7-z][y] = buffer[y][z];
+ }
+ }
+}
+
+
+
+
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