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Diffstat (limited to 'lsys/lsystem.js')
| -rw-r--r-- | lsys/lsystem.js | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/lsys/lsystem.js b/lsys/lsystem.js new file mode 100644 index 0000000..c3896e5 --- /dev/null +++ b/lsys/lsystem.js @@ -0,0 +1,172 @@ +/* LSystem */ + +function LSystem(axiom, ruleset) { + this.alphabet = ['F', '+', '-', '[', ']']; + this.axiom = axiom; + this.rule = ["", "+", "-", "[", "]"]; + this.tree = ""; + + this.rule[0] = ruleset; + + this.draw = function(x, y, zoom, angle, drawtype) { + a.fillStyle = "#000"; + a.strokeStyle = "#000"; + + a.save(); + a.translate(x, y); + + var i; + + for (i=0; i<this.tree.length; i++) { + switch (this.tree.charAt(i)) { + case 'F': + switch (drawtype) { + case 'line': + a.beginPath(); + a.moveTo(0, 0); + a.lineTo(zoom, 0); + a.closePath(); + a.stroke(); + break; + case 'hollow_circle': + a.beginPath(); + a.arc(0, 0, zoom / 10, 0, Math.PI*2, true); + a.closePath(); + a.stroke(); + break; + case 'filled_circle': + a.beginPath(); + a.arc(0, 0, zoom / 10, 0, Math.PI*2, true); + a.closePath(); + a.fill(); + break; + case 'faint': + a.fillStyle = "rgba(0, 0, 0, " + (i / this.tree.length) + ")"; + a.beginPath(); + a.moveTo(Math.random() - .5, Math.random() - .5); + a.lineTo(Math.sin(zoom) + (zoom / 2), Math.random() - .5); + a.lineTo(zoom, 0); + a.closePath(); + a.fill(); + break; + case 'small_circles': + a.fillStyle = "rgba(0, 0, 0, " + (i / this.tree.length) + 0.2 + ")"; + a.beginPath(); + a.moveTo(Math.random() - .5, Math.random() - .5); + a.lineTo(Math.sin(zoom) + (zoom / 2), Math.random() - .5); + a.arc(Math.sin(zoom) + (zoom / 2), Math.random() - .5, zoom / 5, 0, Math.PI*2, true); + a.lineTo(zoom, 0); + a.closePath(); + a.fill(); + break; + case 'triangles': + a.fillStyle = "rgba(0, 0, 0, " + (i / this.tree.length) + ")"; + a.beginPath(); + + var dist = zoom / 2; + var halfdist = dist / 2; + a.moveTo(0, dist); + a.lineTo(halfdist, halfdist); + a.lineTo(dist, 0); + a.lineTo(halfdist, -halfdist); + a.lineTo(0, -dist); + a.closePath(); + a.fill(); + break; + case 'more_circles': + a.fillStyle = "rgba(0, 0, 0, " + Math.random() + ")"; + a.beginPath(); + a.arc(Math.random() + .5, Math.random() - .5, (i / this.tree.length) * 5, 0, Math.PI*2, true); + a.closePath(); + a.fill(); + + a.fillStyle = "rgba(0, 0, 0, " + Math.random() + ")"; + a.beginPath(); + a.arc(Math.random() - .5, Math.random() + .5, (i / this.tree.length) * 3, 0, Math.PI*2, true); + a.closePath(); + a.fill(); + + break; + case 'hatch': + var red = Math.random() * 255; + var green = Math.random() * 255; + var blue = Math.random() * 255; + a.strokeStyle = "rgba(" + red + ", " + green + ", " + blue + ", " + (i / this.tree.length) + ")"; + a.beginPath(); + + var dist = zoom / 2; + a.moveTo(-dist, -dist); + a.lineTo(dist, -dist); + a.moveTo(-dist, 0); + a.lineTo(dist, 0); + a.moveTo(-dist, dist); + a.lineTo(dist, dist); + a.closePath(); + a.stroke(); + break; + } + a.translate(zoom, 0); + break; + + case '+': + a.rotate(angle); + break; + + case '-': + a.rotate(-angle); + break; + + case '[': + a.save(); + break; + + case ']': + a.restore(); + break; + } + } + a.restore(); + } + + this.iterate = function(max_length) { + this.tree = this.axiom; + var rule_length = []; + var i; + + for (i=0; i<this.alphabet.length; i++) { + rule_length[i] = this.rule[i].length; + } + + for (i=0; i<max_length; i++) { + var new_length = 0; + var j; + + for (j=0; j<this.tree.length; j++) { + var c = this.tree.charAt(j); + var k; + + for (k=0; k<this.alphabet.length; k++) { + if (c == this.alphabet[k]) { + new_length += rule_length[k]; + break; + } + } + } + + var new_tree = []; + + for (j=0; j<this.tree.length; j++) { + var c = this.tree.charAt(j); + var k; + + for (k=0; k<this.alphabet.length; k++) { + if (c == this.alphabet[k]) { + new_tree.push(this.rule[k]); + break; + } + } + } + this.tree = new_tree.join(""); + } + } +} |