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-rw-r--r--draw_linear_bezier_reference.c401
1 files changed, 398 insertions, 3 deletions
diff --git a/draw_linear_bezier_reference.c b/draw_linear_bezier_reference.c
index 6066946..c288781 100644
--- a/draw_linear_bezier_reference.c
+++ b/draw_linear_bezier_reference.c
@@ -31,7 +31,7 @@ draw_linear_bezier_reference(RASTER *restrict raster, double x1, double y1, doub
prevX = x1;
prevY = y1;
- for (; prevX != x2 && prevY != y2; prevX = x, prevY = y) {
+ for (; prevX != x2 || prevY != y2; prevX = x, prevY = y) {
/* Find next vertical and next hozitonal grid line */
x = xdir < 0 ? floor(prevX) : xdir > 0 ? ceil(prevX) : prevX;
y = ydir < 0 ? floor(prevY) : ydir > 0 ? ceil(prevY) : prevY;
@@ -92,7 +92,7 @@ draw_linear_bezier_reference(RASTER *restrict raster, double x1, double y1, doub
/* If inside the raster, just draw the line */
cell = (size_t)cellY * raster->width + (size_t)cellX;
raster->cells[cell].opposite_coverage += y - prevY;
- raster->cells[cell].cell_coverage += (y - prevY) * fabs(fmax(ceil(x), ceil(prevX)) - (x + prevX) / 2.0);
+ raster->cells[cell].cell_coverage += (y - prevY) * fabs(xfloor + 1.0 - (x + prevX) / 2.0);
}
}
}
@@ -100,11 +100,406 @@ draw_linear_bezier_reference(RASTER *restrict raster, double x1, double y1, doub
#else
+#define CHECK_ZEROED()\
+ do {\
+ size_t i__;\
+ for (i__ = 0; i__ < 100; i__++) {\
+ ASSERT(!raster->cells[i__].cell_coverage);\
+ ASSERT(!raster->cells[i__].opposite_coverage);\
+ }\
+ } while (0)
+
+#define CHECK_CELL(X, Y, AREA, SHADOW)\
+ do {\
+ size_t i__ = (Y) * raster->width + (X);\
+ ASSERT(raster->cells[i__].cell_coverage == (AREA));\
+ ASSERT(raster->cells[i__].opposite_coverage == (SHADOW));\
+ raster->cells[i__].cell_coverage = 0;\
+ raster->cells[i__].opposite_coverage = 0;\
+ } while (0)
+
+#define SUB_CELL(X, Y, AREA, SHADOW)\
+ do {\
+ size_t i__ = (Y) * raster->width + (X);\
+ raster->cells[i__].cell_coverage -= (AREA);\
+ raster->cells[i__].opposite_coverage -= (SHADOW);\
+ } while (0)
+
+
+static RASTER *raster;
+
+
+#if 0
+static void
+print_raster(void)
+{
+ size_t y, x;
+ printf("\nOutline (area)\n");
+ for (y = 0; y < raster->height; y++) {
+ for (x = 0; x < raster->width; x++)
+ printf(raster->cells[y * raster->width + x].cell_coverage ? "%+.4lf " : " 0 ",
+ raster->cells[y * raster->width + x].cell_coverage);
+ printf("\n");
+ }
+ printf("\nOutline (shadow)\n");
+ for (y = 0; y < raster->height; y++) {
+ for (x = 0; x < raster->width; x++)
+ printf(raster->cells[y * raster->width + x].opposite_coverage ? "%+.4lf " : " 0 ",
+ raster->cells[y * raster->width + x].opposite_coverage);
+ printf("\n");
+ }
+}
+#endif
+
+
+static void
+check_horizontal(void)
+{
+ ssize_t y, x1, x2;
+
+ for (y = -2; y < 12; y++) {
+ for (x1 = -2; x1 < 12; x1++) {
+ for (x2 = -2; x2 < 12; x2++) {
+ draw_linear_bezier_reference(raster, x1, y, x2, y);
+ CHECK_ZEROED();
+
+ draw_linear_bezier_reference(raster, x1 + 0.25, y, x2 + 0.25, y);
+ CHECK_ZEROED();
+
+ draw_linear_bezier_reference(raster, x1, y + 0.25, x2, y + 0.25);
+ CHECK_ZEROED();
+
+ draw_linear_bezier_reference(raster, x1 + 0.25, y + 0.25, x2 + 0.25, y + 0.25);
+ CHECK_ZEROED();
+ }
+ }
+ }
+}
+
+
+static void
+check_vertical(void)
+{
+ ssize_t x, y1, y2, i, ydir;
+ double yhit;
+
+ for (x = -2; x < 12; x++) {
+ for (y1 = -2; y1 < 12; y1++) {
+ for (y2 = -2; y2 < 12; y2++) {
+ ydir = SIGNUM(y2 - y1);
+
+ draw_linear_bezier_reference(raster, x, y1, x, y2);
+ for (i = 0; i < 10; i++) {
+ if (i < y1 && i < y2)
+ continue;
+ if (i >= y1 && i >= y2)
+ continue;
+ CHECK_CELL(x < 0 ? 0 : x < 10 ? x : 9,
+ i,
+ x < 0 ? (double)ydir : x < 10 ? (double)ydir : 0,
+ (double)ydir);
+ }
+ CHECK_ZEROED();
+
+ draw_linear_bezier_reference(raster, x + 0.25, y1, x + 0.25, y2);
+ for (i = 0; i < 10; i++) {
+ if (i < y1 && i < y2)
+ continue;
+ if (i >= y1 && i >= y2)
+ continue;
+ CHECK_CELL(x < 0 ? 0 : x < 10 ? x : 9,
+ i,
+ x < 0 ? (double)ydir : x < 10 ? (double)ydir * 0.75 : 0,
+ (double)ydir);
+ }
+ CHECK_ZEROED();
+
+ draw_linear_bezier_reference(raster, x, y1 + 0.25, x, y2 + 0.25);
+ for (i = 0; i < 10; i++) {
+ if (i < y1 + (y1 > y2) && i < y2 + (y2 > y1))
+ continue;
+ if (i >= y1 + (y1 > y2) && i >= y2 + (y2 > y1))
+ continue;
+ yhit = i == (y1 < y2 ? y1 : y2) ? 0.75 : i == (y2 > y1 ? y2 : y1) ? 0.25 : 1.0;
+ CHECK_CELL(x < 0 ? 0 : x < 10 ? x : 9,
+ i,
+ (x < 0 ? (double)ydir : x < 10 ? (double)ydir : 0) * yhit,
+ (double)ydir * yhit);
+ }
+ CHECK_ZEROED();
+
+ draw_linear_bezier_reference(raster, x + 0.25, y1 + 0.25, x + 0.25, y2 + 0.25);
+ for (i = 0; i < 10; i++) {
+ if (i < y1 + (y1 > y2) && i < y2 + (y2 > y1))
+ continue;
+ if (i >= y1 + (y1 > y2) && i >= y2 + (y2 > y1))
+ continue;
+ yhit = i == (y1 < y2 ? y1 : y2) ? 0.75 : i == (y2 > y1 ? y2 : y1) ? 0.25 : 1.0;
+ CHECK_CELL(x < 0 ? 0 : x < 10 ? x : 9,
+ i,
+ (x < 0 ? (double)ydir : x < 10 ? (double)ydir * 0.75 : 0) * yhit,
+ (double)ydir * yhit);
+ }
+ CHECK_ZEROED();
+ }
+ }
+ }
+}
+
+
+static void
+check_11_diagonal(ssize_t xshift, ssize_t yshift)
+{
+ ssize_t i1, i2, i, imin, imax, idir, x, y;
+
+ for (i1 = -2; i1 < 12; i1++) {
+ for (i2 = -2; i2 < 12; i2++) {
+ imin = i1 < i2 ? i1 : i2;
+ imax = i1 > i2 ? i1 : i2;
+ idir = SIGNUM(i2 - i1);
+
+ draw_linear_bezier_reference(raster, i1 + xshift, i1 + yshift, i2 + xshift, i2 + yshift);
+ for (i = imin; i < imax; i++) {
+ x = i + xshift;
+ y = i + yshift;
+ if (y < 0 || y >= 10)
+ continue;
+ if (x >= 10)
+ CHECK_CELL(9, y, 0, idir);
+ else if (x >= 0)
+ CHECK_CELL(x, y, 0.5 * idir, idir);
+ else
+ CHECK_CELL(0, y, idir, idir);
+ }
+ CHECK_ZEROED();
+
+ draw_linear_bezier_reference(raster, i1 + xshift, i1 + yshift + 0.25, i2 + xshift, i2 + yshift + 0.25);
+ for (i = imin; i < imax; i++) {
+ x = i + xshift;
+ y = i + yshift;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, idir * 0.75);
+ else if (x >= 0)
+ SUB_CELL(x, y, idir * (0.75 - 0.75 * 0.75 / 2), idir * 0.75);
+ else
+ SUB_CELL(0, y, idir * 0.75, idir * 0.75);
+ }
+ x = i + xshift;
+ y = i + yshift + 1;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, idir * 0.25);
+ else if (x >= 0)
+ SUB_CELL(x, y, idir * 0.25 * 0.25 / 2, idir * 0.25);
+ else
+ SUB_CELL(0, y, idir * 0.25, idir * 0.25);
+ }
+ }
+ CHECK_ZEROED();
+
+ draw_linear_bezier_reference(raster, i1 + xshift + 0.25, i1 + yshift, i2 + xshift + 0.25, i2 + yshift);
+ for (i = imin; i < imax; i++) {
+ x = i + xshift;
+ y = i + yshift;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, idir * 0.75);
+ else if (x >= 0)
+ SUB_CELL(x, y, idir * 0.75 * 0.75 / 2, idir * 0.75);
+ else
+ SUB_CELL(0, y, idir * 0.75, idir * 0.75);
+ }
+ x = i + xshift + 1;
+ y = i + yshift;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, idir * 0.25);
+ else if (x >= 0)
+ SUB_CELL(x, y, idir * (0.25 - 0.25 * 0.25 / 2), idir * 0.25);
+ else
+ SUB_CELL(0, y, idir * 0.25, idir * 0.25);
+ }
+ }
+ CHECK_ZEROED();
+
+ draw_linear_bezier_reference(raster, i1 + xshift + 0.25, i1 + yshift + 0.25,
+ i2 + xshift + 0.25, i2 + yshift + 0.25);
+ for (i = imin; i < imax; i++) {
+ x = i + xshift;
+ y = i + yshift;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, idir * 0.75);
+ else if (x >= 0)
+ SUB_CELL(x, y, idir * 0.75 * 0.75 / 2, idir * 0.75);
+ else
+ SUB_CELL(0, y, idir * 0.75, idir * 0.75);
+ }
+ x = i + xshift + 1;
+ y = i + yshift + 1;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, idir * 0.25);
+ else if (x >= 0)
+ SUB_CELL(x, y, idir * (0.25 - 0.25 * 0.25 / 2), idir * 0.25);
+ else
+ SUB_CELL(0, y, idir * 0.25, idir * 0.25);
+ }
+ }
+ CHECK_ZEROED();
+ }
+ }
+}
+
+
+static void
+check_11_antidiagonal(ssize_t xshift, ssize_t yshift)
+{
+ ssize_t i1, i2, i, imin, imax, ydir, x, y;
+
+ for (i1 = -2; i1 < 12; i1++) {
+ for (i2 = -2; i2 < 12; i2++) {
+ imin = i1 < i2 ? i1 : i2;
+ imax = i1 > i2 ? i1 : i2;
+ ydir = -SIGNUM(i2 - i1);
+
+ draw_linear_bezier_reference(raster, i1 + xshift, i2 + yshift, i2 + xshift, i1 + yshift);
+ for (i = imin; i < imax; i++) {
+ x = i + xshift;
+ y = imax - i + imin + yshift - 1;
+ if (y < 0 || y >= 10)
+ continue;
+ if (x >= 10)
+ CHECK_CELL(9, y, 0, ydir);
+ else if (x >= 0)
+ CHECK_CELL(x, y, 0.5 * ydir, ydir);
+ else
+ CHECK_CELL(0, y, ydir, ydir);
+ }
+ CHECK_ZEROED();
+
+ draw_linear_bezier_reference(raster, i1 + xshift, i2 + yshift + 0.25, i2 + xshift, i1 + yshift + 0.25);
+ for (i = imin; i < imax; i++) {
+ x = i + xshift;
+ y = imax - i + imin + yshift - 1;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, ydir * 0.75);
+ else if (x >= 0)
+ SUB_CELL(x, y, ydir * 0.75 * 0.75 / 2, ydir * 0.75);
+ else
+ SUB_CELL(0, y, ydir * 0.75, ydir * 0.75);
+ }
+ x = i + xshift;
+ y = imax - i + imin + yshift - 1 + 1;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, ydir * 0.25);
+ else if (x >= 0)
+ SUB_CELL(x, y, ydir * (0.25 - 0.25 * 0.25 / 2), ydir * 0.25);
+ else
+ SUB_CELL(0, y, ydir * 0.25, ydir * 0.25);
+ }
+ }
+ CHECK_ZEROED();
+
+ draw_linear_bezier_reference(raster, i1 + xshift + 0.25, i2 + yshift, i2 + xshift + 0.25, i1 + yshift);
+ for (i = imin; i < imax; i++) {
+ x = i + xshift;
+ y = imax - i + imin + yshift - 1;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, ydir * 0.75);
+ else if (x >= 0)
+ SUB_CELL(x, y, ydir * 0.75 * 0.75 / 2, ydir * 0.75);
+ else
+ SUB_CELL(0, y, ydir * 0.75, ydir * 0.75);
+ }
+ x = i + xshift + 1;
+ y = imax - i + imin + yshift - 1;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, ydir * 0.25);
+ else if (x >= 0)
+ SUB_CELL(x, y, ydir * (0.25 - 0.25 * 0.25 / 2), ydir * 0.25);
+ else
+ SUB_CELL(0, y, ydir * 0.25, ydir * 0.25);
+ }
+ }
+ CHECK_ZEROED();
+
+ draw_linear_bezier_reference(raster, i1 + xshift + 0.25, i2 + yshift + 0.25,
+ i2 + xshift + 0.25, i1 + yshift + 0.25);
+ for (i = imin; i < imax; i++) {
+ x = i + xshift;
+ y = imax - i + imin + yshift - 1;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, ydir * 0.5);
+ else if (x >= 0)
+ SUB_CELL(x, y, ydir / 8.0, ydir * 0.5);
+ else
+ SUB_CELL(0, y, ydir * 0.5, ydir * 0.5);
+ }
+ x = i + xshift;
+ y = imax - i + imin + yshift - 1 + 1;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, ydir * 0.25);
+ else if (x >= 0)
+ SUB_CELL(x, y, ydir * (2.5 / 16.0), ydir * 0.25);
+ else
+ SUB_CELL(0, y, ydir * 0.25, ydir * 0.25);
+ }
+ x = i + xshift + 1;
+ y = imax - i + imin + yshift - 1;
+ if (0 <= y && y < 10) {
+ if (x >= 10)
+ SUB_CELL(9, y, 0, ydir * 0.25);
+ else if (x >= 0)
+ SUB_CELL(x, y, ydir * (3.5 / 16.0), ydir * 0.25);
+ else
+ SUB_CELL(0, y, ydir * 0.25, ydir * 0.25);
+ }
+ }
+ CHECK_ZEROED();
+ }
+ }
+}
+
int
main(void)
{
- return 0; /* TODO add test */
+ raster = rtgrpblib_create_raster(10, 10);
+ ASSERT(raster);
+
+ check_horizontal();
+ check_vertical();
+
+ check_11_diagonal(0, 0);
+ check_11_diagonal(0, 2);
+ check_11_diagonal(0, -2);
+ check_11_diagonal(2, 0);
+ check_11_diagonal(2, 2);
+ check_11_diagonal(2, -2);
+ check_11_diagonal(-2, 0);
+ check_11_diagonal(-2, 2);
+ check_11_diagonal(-2, -2);
+
+ check_11_antidiagonal(0, 0);
+ check_11_antidiagonal(0, 2);
+ check_11_antidiagonal(0, -2);
+ check_11_antidiagonal(2, 0);
+ check_11_antidiagonal(2, 2);
+ check_11_antidiagonal(2, -2);
+ check_11_antidiagonal(-2, 0);
+ check_11_antidiagonal(-2, 2);
+ check_11_antidiagonal(-2, -2);
+
+ free(raster);
+ return 0;
}
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