Obj needed for signature

Author: monkstone

external_library/java/PixelFlow/fluid_minimal.rb

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+load_library :PixelFlow
+
+java_import 'com.thomasdiewald.pixelflow.java.DwPixelFlow'
+java_import 'com.thomasdiewald.pixelflow.java.fluid.DwFluid2D'
+#
+# PixelFlow | Copyright (C) 2016 Thomas Diewald - http://thomasdiewald.com
+# Modified for JrubyArt by Martin Prout
+# A Processing/Java library for high performance GPU-Computing (GLSL).
+# MIT License: https://opensource.org/licenses/MIT
+#
+
+# Simple example that shows how to add Data (density, velocity) to the fluid.
+#
+# controls:
+#
+# LMB: add Density + Velocity
+# MMB: add Velocity
+# RMB: add Velocity
+
+VIEWPORT_W = 1280
+VIEWPORT_H = 720
+VIEWPORT_X = 230
+VIEWPORT_Y = 0
+BACKGROUND_COLOR = 255
+
+attr_reader :fluidgrid_scale, :fluid, :pg_fluid, :pg_obstacles, :context
+
+def settings
+  size(VIEWPORT_W, VIEWPORT_H, P2D)
+  smooth(2)
+end
+
+def setup
+  surface.setLocation(VIEWPORT_X, VIEWPORT_Y)
+  # main library context
+  @context = DwPixelFlow.new(self)
+  context.print
+  context.printGL
+  # fluid simulation
+  @fluid = DwFluid2D.new(context, VIEWPORT_W, VIEWPORT_H, fluidgrid_scale)
+  cb_fluid_data = lambda do |obj| # obj required for signature (but unused)
+    if mouse_pressed?
+      vscale = 15
+      px     = mouse_x
+      py     = height - mouse_y
+      vx     = (mouse_x - pmouse_x) * +vscale
+      vy     = (mouse_y - pmouse_y) * -vscale
+      radius = 20
+      intensity = 1.0
+      temperature = 5.0
+      fluid.add_velocity(px, py, radius, vx, vy)
+      if mouse_button == LEFT
+        fluid.add_temperature(px, py, radius, temperature)
+        radius = 20
+        fluid.add_density(px, py, radius, 0, 0, 0, intensity)
+        radius = 16
+        fluid.add_density(px, py, radius, 0, 0.4, 1, intensity)
+      end
+    end
+  end
+  @fluidgrid_scale = 1
+  # set some simulation parameters
+  fluid.param.dissipation_density     = 0.98
+  fluid.param.dissipation_velocity    = 0.92
+  fluid.param.dissipation_temperature = 0.69
+  fluid.param.vorticity               = 0.10
+  # interface for adding data to the fluid simulation
+  fluid.addCallback_FluiData(cb_fluid_data)
+  # pgraphics for fluid
+  @pg_fluid = create_graphics(VIEWPORT_W, VIEWPORT_H, P2D)
+  pg_fluid.smooth(4)
+  # pgraphics for obstacles
+  @pg_obstacles = create_graphics(VIEWPORT_W, VIEWPORT_H, P2D)
+  pg_obstacles.no_smooth
+  pg_obstacles.begin_draw
+  pg_obstacles.clear
+  # rand obstacles
+  pg_obstacles.rect_mode(CENTER)
+  pg_obstacles.no_stroke
+  pg_obstacles.fill(64)
+  srand(0)
+  80.times do
+    px = rand(width)
+    py = rand(height)
+    sx = rand(15..60)
+    sy = rand(15..60)
+    pg_obstacles.rect(px, py, sx, sy)
+  end
+  # border-obstacle
+  pg_obstacles.rect_mode(CORNER)
+  pg_obstacles.stroke_weight(20)
+  pg_obstacles.stroke(64)
+  pg_obstacles.no_fill
+  pg_obstacles.rect(0, 0, pg_obstacles.width, pg_obstacles.height)
+  pg_obstacles.end_draw
+  # add to the fluid-solver
+  fluid.add_obstacles(pg_obstacles)
+  frame_rate(60)
+end
+
+def draw
+  # update simulation
+  fluid.update
+  # clear render target
+  pg_fluid.begin_draw
+  pg_fluid.background(BACKGROUND_COLOR)
+  pg_fluid.end_draw
+  # render fluid stuff
+  fluid.render_fluid_textures(pg_fluid, 0)
+  # display
+  image(pg_fluid, 0, 0)
+  image(pg_obstacles, 0, 0)
+  # info
+  format_string = 'Fluid Minimal  [size %d/%d]  [frame %d]  [fps: (%6.2f)]'
+  surface.set_title(format(format_string, fluid.fluid_w, fluid.fluid_h, fluid.simulation_step, frame_rate))
+end