Added bezier

examples/bezier/bezier.collection

@@ -0,0 +1,217 @@
+name: "default"
+scale_along_z: 0
+embedded_instances {
+  id: "go"
+  data: "components {\n"
+  "  id: \"bezier\"\n"
+  "  component: \"/examples/bezier/bezier.script\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  "embedded_components {\n"
+  "  id: \"sprite\"\n"
+  "  type: \"sprite\"\n"
+  "  data: \"tile_set: \\\"/examples/assets/examples.atlas\\\"\\n"
+  "default_animation: \\\"blue_circle\\\"\\n"
+  "material: \\\"/builtins/materials/sprite.material\\\"\\n"
+  "blend_mode: BLEND_MODE_ALPHA\\n"
+  "\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}
+embedded_instances {
+  id: "cp1"
+  data: "embedded_components {\n"
+  "  id: \"sprite\"\n"
+  "  type: \"sprite\"\n"
+  "  data: \"tile_set: \\\"/examples/assets/examples.atlas\\\"\\n"
+  "default_animation: \\\"green_circle\\\"\\n"
+  "material: \\\"/builtins/materials/sprite.material\\\"\\n"
+  "blend_mode: BLEND_MODE_ALPHA\\n"
+  "\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+    x: 102.845
+    y: 77.718
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}
+embedded_instances {
+  id: "cp2"
+  data: "embedded_components {\n"
+  "  id: \"sprite\"\n"
+  "  type: \"sprite\"\n"
+  "  data: \"tile_set: \\\"/examples/assets/examples.atlas\\\"\\n"
+  "default_animation: \\\"green_circle\\\"\\n"
+  "material: \\\"/builtins/materials/sprite.material\\\"\\n"
+  "blend_mode: BLEND_MODE_ALPHA\\n"
+  "\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+    x: 303.463
+    y: 201.442
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}
+embedded_instances {
+  id: "cp3"
+  data: "embedded_components {\n"
+  "  id: \"sprite\"\n"
+  "  type: \"sprite\"\n"
+  "  data: \"tile_set: \\\"/examples/assets/examples.atlas\\\"\\n"
+  "default_animation: \\\"green_circle\\\"\\n"
+  "material: \\\"/builtins/materials/sprite.material\\\"\\n"
+  "blend_mode: BLEND_MODE_ALPHA\\n"
+  "\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+    x: 349.744
+    y: 466.354
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}
+embedded_instances {
+  id: "cp4"
+  data: "embedded_components {\n"
+  "  id: \"sprite\"\n"
+  "  type: \"sprite\"\n"
+  "  data: \"tile_set: \\\"/examples/assets/examples.atlas\\\"\\n"
+  "default_animation: \\\"green_circle\\\"\\n"
+  "material: \\\"/builtins/materials/sprite.material\\\"\\n"
+  "blend_mode: BLEND_MODE_ALPHA\\n"
+  "\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+    x: 797.818
+    y: 283.467
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}

examples/bezier/bezier.script

@@ -0,0 +1,47 @@
+local bezier = require "ludobits.m.bezier"
+
+
+local function animate(self)
+	local p = table.remove(self.points, 1)
+	if not p then
+		return
+	end
+	go.animate(".", "position", go.PLAYBACK_ONCE_FORWARD, p, go.EASING_LINEAR, 0.05, 0, animate)
+end
+
+function init(self)
+	local cps = {
+		go.get_position("cp1"),
+		go.get_position("cp2"),
+		go.get_position("cp3"),
+		go.get_position("cp4"),
+	}
+	self.points = bezier.create(cps, 20)
+	go.set_position(cps[1])
+	animate(self)
+end
+
+function final(self)
+	-- Add finalization code here
+	-- Remove this function if not needed
+end
+
+function update(self, dt)
+	-- Add update code here
+	-- Remove this function if not needed
+end
+
+function on_message(self, message_id, message, sender)
+	-- Add message-handling code here
+	-- Remove this function if not needed
+end
+
+function on_input(self, action_id, action)
+	-- Add input-handling code here
+	-- Remove this function if not needed
+end
+
+function on_reload(self)
+	-- Add reload-handling code here
+	-- Remove this function if not needed
+end

ludobits/m/bezier.lua

@@ -0,0 +1,43 @@
+local M = {}
+
+
+local function point_on_cubic_bezier(cp, t)
+	local ax, bx, cx
+	local ay, by, cy
+	local tSquared, tCubed
+
+	--  /* calculation of the polinomial coeficients */
+
+	cx = 3.0 * (cp[2].x - cp[1].x)
+	bx = 3.0 * (cp[1].x - cp[2].x) - cx
+	ax = cp[4].x - cp[1].x - cx - bx
+
+	cy = 3.0 * (cp[2].y - cp[1].y)
+	by = 3.0 * (cp[3].y - cp[2].y) - cy
+	ay = cp[4].y - cp[1].y - cy - by
+
+	--  /* calculate the curve point at parameter value t */
+
+	tSquared = t * t
+	tCubed = tSquared * t
+
+	local result = vmath.vector3()
+	result.x = (ax * tCubed) + (bx * tSquared) + (cx * t) + cp[1].x
+	result.y = (ay * tCubed) + (by * tSquared) + (cy * t) + cp[1].y
+	return result
+end
+
+
+function M.create(cp, points)
+	local curve = {}
+	local dt = 1.0 / (points - 1)
+	local i
+
+	for i = 1, points do
+		curve[i] = point_on_cubic_bezier(cp, i * dt)
+		i = i + 1
+	end
+	return curve
+end
+
+return M