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April 18, 2024 18:41
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Building a simple scene graph, part 2.
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import "events" | |
import "json" | |
import "stringUtil" | |
import "tc" | |
Ellipse = {} | |
Ellipse.make = function(x, y, width, height, color=null, penSize=1) | |
if color == null then color == gfx.color | |
self.className = "Ellipse" | |
self.left = x - width / 2 | |
self.bottom = y - height / 2 | |
self.width = width | |
self.height = height | |
self.color = color | |
self.penSize = penSize | |
return self | |
end function | |
Ellipse.fromJSON = function(obj) | |
return (new Ellipse).make(obj.left, obj.bottom, obj.width, obj.height, obj.color, obj.penSize) | |
end function | |
Ellipse.draw = function | |
gfx.drawEllipse self.left, self.bottom, self.width, self.height, self.color, self.penSize | |
end function | |
Ellipse.moveTo = function(x, y) | |
self.left = x - self.width / 2 | |
self.bottom = y - self.height / 2 | |
end function | |
Ellipse.toJSON = function | |
return { | |
"class": self.className, | |
"left": self.left, | |
"bottom": self.bottom, | |
"width": self.width, | |
"height": self.height, | |
"color": self.color, | |
"penSize": self.penSize, | |
} | |
end function | |
Circle = new Ellipse | |
Circle.make = function(x, y, radius, color=null, penSize=1) | |
self.className = "Circle" | |
diameter = radius * 2 | |
Ellipse.make(x, y, diameter, diameter, color, penSize) | |
return self | |
end function | |
Circle.fromJSON = function(obj) | |
return (new Circle).make(obj.left, obj.bottom, obj.radius, obj.color, obj.penSize) | |
end function | |
Circle.getRadius = function | |
return self.width / 2 | |
end function | |
Circle.setRadius = function(r) | |
self.width = r * 2 | |
self.height = r * 2 | |
end function | |
Circle.toJSON = function | |
return { | |
"class": self.className, | |
"left": self.left, | |
"bottom": self.bottom, | |
"radius": self.getRadius, | |
"color": self.color, | |
"penSize": self.penSize, | |
} | |
end function | |
saveState = function(scene, path) | |
objects = [] | |
for obj in scene | |
objects.push obj.toJSON | |
end for | |
text = json.toJSON(objects) | |
file.writeLines path, [text] | |
end function | |
loadState = function(path) | |
objects = json.parse(file.open(path).read) | |
scene = [] | |
for obj in objects | |
if obj.class == "Ellipse" then | |
scene.push Ellipse.fromJSON(obj) | |
else if obj.class == "Circle" then | |
scene.push Circle.fromJSON(obj) | |
end if | |
end for | |
return scene | |
end function | |
events.eventLoop.onKey["escape"] = function | |
events.eventLoop.running = false | |
end function | |
events.eventLoop.onUpdate = function | |
tc.flip | |
gfx.clear | |
for obj in scene | |
obj.draw | |
end for | |
circle.moveTo mouse.x, mouse.y | |
scrollDelta = key.axis("Mouse ScrollWheel") | |
circle.setRadius circle.getRadius + scrollDelta | |
end function | |
clear | |
if file.exists("scene.json") then | |
scene = loadState("scene.json") | |
else | |
scene = [ | |
(new Ellipse).make(200, 200, 400, 150, color.red, 3), | |
(new Circle).make(100, 300, 40, color.blue, 2), | |
] | |
end if | |
circle = scene[1] | |
events.eventLoop.run | |
saveState scene, "scene.json" | |
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