Geometric star: C2C Graphgan Generator

Rasterizing a five-point star deliberately

This thirteen-by-thirteen panel is an original geometric drawing sampled onto a C2C block grid. Five outside vertices alternate with five inset vertices around a shared center. Gold blocks fill the resulting star on navy fabric. The design problem is the difference between a continuous geometric outline and the stepped boundary that whole crochet blocks can actually represent. The saved bitmap, rather than an ideal smooth star imagined over it, is the construction specification.

Check the points before beginning

Open the exact graph and identify the upper point, both sideways points and both lower points. The navy notches between them are part of the rectangle and must be worked. Reflect the grid horizontally to check the drawing's intended left-right balance. Do not expect every point to contain an identical number of square cells: a raster samples differently oriented edges at different angles. Review the actual color budget shown below and the twenty-five numbered diagonals. All 169 blocks are worked, giving 507 completed dc posts before lifting chains and joins.

Choose an effective foreground

A small pointed motif benefits from a clear value difference between foreground and background. Make connected blocks in both yarns, finish the trial, and inspect the gold edge against navy. A shiny yarn can change the apparent edge under different lighting, so a favorable digital swatch is not sufficient. Keep the foreground yarn consistent through a point; accidentally using a different gold dye or texture can create a false break that does not exist in the saved grid.

Follow the staircase rather than smoothing it

Start at the lower-left coordinate and use the diagonal route, even when a star arm seems easier to follow horizontally. Change color before the first block of the next run. The edge naturally moves in one-block steps. Adding a half block or skipping a navy block to smooth a notch would create a different and unvalidated construction. For a more detailed star, author a new higher-resolution graph and verify all its diagonals; simply multiplying the physical yarn size preserves the same coarse steps.

Use and finish the study

This panel can be a reference for a cushion section or another independently planned rectangular project. Its thirteen blocks per side become physical dimensions only after you measure a washed block swatch. Weave foreground ends into gold regions and background ends into navy where practical, without tightening the points. Confirm the outline and the full rectangular boundary after blocking. Joining or edging the panel requires its own measured seam or receiving-edge count; neither is included in the star bitmap.

FAQ and common mistakes

Why do the two bottom points differ from the top?

Their edges meet the square grid at different angles. Compare with the actual saved cells before diagnosing an intentional raster step as a crochet error.

Can I omit the background notches?

No. The graph describes filled rectangular fabric. Missing blocks would alter both connectivity and the route to later diagonals.

How can I repair a crooked arm?

Find the earliest coordinate whose color differs from the source matrix. Undo to that block and restore the intended color, rather than compensating at the opposite point.

Actual parameters and yarn budget

Use 13 blocks across and 13 high in US terms. The exact palette is yarn 1: #172C50 (118 blocks); yarn 2: #F1BF38 (51 blocks). These block totals describe the saved drawing, not yarn meters. A compatible block swatch is needed before estimating physical dimensions or material consumption.

Exact source and complete working instructions

Download this original graph as JSON and restore it in the C2C Graphgan Generator. Start with ch 6 and dc in the fourth, fifth and sixth chains from the hook. Each later block uses the written chain space, ch 3 and 3 dc; follow its coordinate and edge phase. In UK terminology these dc posts are tr. Read the chart-reading guide if the displayed picture and working route are unfamiliar.

Reverse the working direction once between successive diagonals. For an increase start, turn before making the new chain-six block. For a decrease start, the listed instruction already includes the turn; do not turn a second time. Follow the starting-edge action even when successive diagonals have equal block counts.

1. Diagonal 1: (1,1) color 1. Ch 6; dc in fourth, fifth and sixth chains from hook. Stop after 1 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [1 blocks]
2. Diagonal 2: (2,1) color 1 → (1,2) color 1. Increase at the starting edge: ch 6, dc in fourth through sixth chains to make the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 2 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [2 blocks]
3. Diagonal 3: (1,3) color 1 → (2,2) color 1 → (3,1) color 1. Increase at the starting edge: ch 6, dc in fourth through sixth chains to make the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 3 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [3 blocks]
4. Diagonal 4: (4,1) color 1 → (3,2) color 1 → (2,3) color 1 → (1,4) color 1. Increase at the starting edge: ch 6, dc in fourth through sixth chains to make the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 4 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [4 blocks]
5. Diagonal 5: (1,5) color 1 → (2,4) color 1 → (3,3) color 1 → (4,2) color 1 → (5,1) color 1. Increase at the starting edge: ch 6, dc in fourth through sixth chains to make the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 5 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [5 blocks]
6. Diagonal 6: (6,1) color 1 → (5,2) color 1 → (4,3) color 2 → (3,4) color 1 → (2,5) color 1 → (1,6) color 1. Increase at the starting edge: ch 6, dc in fourth through sixth chains to make the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 6 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [6 blocks]
7. Diagonal 7: (1,7) color 1 → (2,6) color 1 → (3,5) color 1 → (4,4) color 2 → (5,3) color 1 → (6,2) color 1 → (7,1) color 1. Increase at the starting edge: ch 6, dc in fourth through sixth chains to make the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 7 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [7 blocks]
8. Diagonal 8: (8,1) color 1 → (7,2) color 1 → (6,3) color 1 → (5,4) color 2 → (4,5) color 1 → (3,6) color 1 → (2,7) color 1 → (1,8) color 1. Increase at the starting edge: ch 6, dc in fourth through sixth chains to make the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 8 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [8 blocks]
9. Diagonal 9: (1,9) color 1 → (2,8) color 1 → (3,7) color 1 → (4,6) color 1 → (5,5) color 2 → (6,4) color 2 → (7,3) color 1 → (8,2) color 1 → (9,1) color 1. Increase at the starting edge: ch 6, dc in fourth through sixth chains to make the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 9 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [9 blocks]
10. Diagonal 10: (10,1) color 1 → (9,2) color 1 → (8,3) color 1 → (7,4) color 1 → (6,5) color 2 → (5,6) color 2 → (4,7) color 2 → (3,8) color 2 → (2,9) color 2 → (1,10) color 1. Increase at the starting edge: ch 6, dc in fourth through sixth chains to make the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 10 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [10 blocks]
11. Diagonal 11: (1,11) color 1 → (2,10) color 1 → (3,9) color 2 → (4,8) color 2 → (5,7) color 2 → (6,6) color 2 → (7,5) color 2 → (8,4) color 2 → (9,3) color 1 → (10,2) color 1 → (11,1) color 1. Increase at the starting edge: ch 6, dc in fourth through sixth chains to make the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 11 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [11 blocks]
12. Diagonal 12: (12,1) color 1 → (11,2) color 1 → (10,3) color 2 → (9,4) color 2 → (8,5) color 2 → (7,6) color 2 → (6,7) color 2 → (5,8) color 2 → (4,9) color 2 → (3,10) color 1 → (2,11) color 1 → (1,12) color 1. Increase at the starting edge: ch 6, dc in fourth through sixth chains to make the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 12 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [12 blocks]
13. Diagonal 13: (1,13) color 1 → (2,12) color 1 → (3,11) color 1 → (4,10) color 1 → (5,9) color 2 → (6,8) color 2 → (7,7) color 2 → (8,6) color 2 → (9,5) color 2 → (10,4) color 2 → (11,3) color 1 → (12,2) color 1 → (13,1) color 1. Increase at the starting edge: ch 6, dc in fourth through sixth chains to make the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 13 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [13 blocks]
14. Diagonal 14: (13,2) color 1 → (12,3) color 1 → (11,4) color 1 → (10,5) color 1 → (9,6) color 2 → (8,7) color 2 → (7,8) color 2 → (6,9) color 2 → (5,10) color 1 → (4,11) color 1 → (3,12) color 1 → (2,13) color 1. Decrease at the starting edge: turn, slip stitch across 3 dc and into the ch-3 space; ch 3 and 3 dc in that space for the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 12 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [12 blocks]
15. Diagonal 15: (3,13) color 1 → (4,12) color 1 → (5,11) color 1 → (6,10) color 2 → (7,9) color 2 → (8,8) color 2 → (9,7) color 2 → (10,6) color 1 → (11,5) color 1 → (12,4) color 1 → (13,3) color 1. Decrease at the starting edge: turn, slip stitch across 3 dc and into the ch-3 space; ch 3 and 3 dc in that space for the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 11 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [11 blocks]
16. Diagonal 16: (13,4) color 1 → (12,5) color 1 → (11,6) color 1 → (10,7) color 2 → (9,8) color 2 → (8,9) color 2 → (7,10) color 2 → (6,11) color 1 → (5,12) color 1 → (4,13) color 1. Decrease at the starting edge: turn, slip stitch across 3 dc and into the ch-3 space; ch 3 and 3 dc in that space for the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 10 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [10 blocks]
17. Diagonal 17: (5,13) color 1 → (6,12) color 1 → (7,11) color 2 → (8,10) color 2 → (9,9) color 2 → (10,8) color 2 → (11,7) color 1 → (12,6) color 1 → (13,5) color 1. Decrease at the starting edge: turn, slip stitch across 3 dc and into the ch-3 space; ch 3 and 3 dc in that space for the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 9 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [9 blocks]
18. Diagonal 18: (13,6) color 1 → (12,7) color 1 → (11,8) color 2 → (10,9) color 2 → (9,10) color 1 → (8,11) color 1 → (7,12) color 2 → (6,13) color 1. Decrease at the starting edge: turn, slip stitch across 3 dc and into the ch-3 space; ch 3 and 3 dc in that space for the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 8 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [8 blocks]
19. Diagonal 19: (7,13) color 2 → (8,12) color 1 → (9,11) color 1 → (10,10) color 1 → (11,9) color 2 → (12,8) color 1 → (13,7) color 1. Decrease at the starting edge: turn, slip stitch across 3 dc and into the ch-3 space; ch 3 and 3 dc in that space for the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 7 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [7 blocks]
20. Diagonal 20: (13,8) color 1 → (12,9) color 2 → (11,10) color 1 → (10,11) color 1 → (9,12) color 1 → (8,13) color 1. Decrease at the starting edge: turn, slip stitch across 3 dc and into the ch-3 space; ch 3 and 3 dc in that space for the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 6 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [6 blocks]
21. Diagonal 21: (9,13) color 1 → (10,12) color 1 → (11,11) color 1 → (12,10) color 1 → (13,9) color 1. Decrease at the starting edge: turn, slip stitch across 3 dc and into the ch-3 space; ch 3 and 3 dc in that space for the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 5 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [5 blocks]
22. Diagonal 22: (13,10) color 1 → (12,11) color 1 → (11,12) color 1 → (10,13) color 1. Decrease at the starting edge: turn, slip stitch across 3 dc and into the ch-3 space; ch 3 and 3 dc in that space for the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 4 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [4 blocks]
23. Diagonal 23: (11,13) color 1 → (12,12) color 1 → (13,11) color 1. Decrease at the starting edge: turn, slip stitch across 3 dc and into the ch-3 space; ch 3 and 3 dc in that space for the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 3 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [3 blocks]
24. Diagonal 24: (13,12) color 1 → (12,13) color 1. Decrease at the starting edge: turn, slip stitch across 3 dc and into the ch-3 space; ch 3 and 3 dc in that space for the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 2 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [2 blocks]
25. Diagonal 25: (13,13) color 1. Decrease at the starting edge: turn, slip stitch across 3 dc and into the ch-3 space; ch 3 and 3 dc in that space for the first block. For each remaining listed block: sl st into the next ch-3 space, ch 3, 3 dc in that space. Stop after 1 blocks; do not extend beyond the grid. Change yarn on the last pull-through before each new color. [1 blocks]