465 lines
18 KiB
Lua
465 lines
18 KiB
Lua
-- primitives for editing drawings
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Drawing = {}
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geom = require 'geom'
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function Drawing.draw(line, y)
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local pmx,pmy = love.mouse.getX(), love.mouse.getY()
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if pmx < 16+Drawing_width and pmy > line.y and pmy < line.y+Drawing.pixels(line.h) then
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love.graphics.setColor(0.75,0.75,0.75)
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love.graphics.rectangle('line', 16,line.y, Drawing_width,Drawing.pixels(line.h))
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if icon[Current_drawing_mode] then
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icon[Current_drawing_mode](16+Drawing_width-20, line.y+4)
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else
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icon[Previous_drawing_mode](16+Drawing_width-20, line.y+4)
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end
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if love.mouse.isDown('1') and love.keyboard.isDown('h') then
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draw_help_with_mouse_pressed(line)
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return
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end
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end
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if line.show_help then
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draw_help_without_mouse_pressed(line)
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return
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end
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local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-line.y)
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for _,shape in ipairs(line.shapes) do
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assert(shape)
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if geom.on_shape(mx,my, line, shape) then
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love.graphics.setColor(1,0,0)
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else
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love.graphics.setColor(0,0,0)
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end
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Drawing.draw_shape(16,line.y, line, shape)
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end
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for _,p in ipairs(line.points) do
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if p.deleted == nil then
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if Drawing.near(p, mx,my) then
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love.graphics.setColor(1,0,0)
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love.graphics.circle('line', Drawing.pixels(p.x)+16,Drawing.pixels(p.y)+line.y, 4)
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else
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love.graphics.setColor(0,0,0)
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love.graphics.circle('fill', Drawing.pixels(p.x)+16,Drawing.pixels(p.y)+line.y, 2)
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end
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end
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end
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Drawing.draw_pending_shape(16,line.y, line)
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end
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function Drawing.in_drawing(drawing, x,y)
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return y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width
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end
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function Drawing.mouse_pressed(drawing, x,y, button)
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if Current_drawing_mode == 'freehand' then
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drawing.pending = {mode=Current_drawing_mode, points={{x=Drawing.coord(x-16), y=Drawing.coord(y-drawing.y)}}}
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elseif Current_drawing_mode == 'line' or Current_drawing_mode == 'manhattan' then
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local j = Drawing.insert_point(drawing.points, Drawing.coord(x-16), Drawing.coord(y-drawing.y))
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drawing.pending = {mode=Current_drawing_mode, p1=j}
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elseif Current_drawing_mode == 'polygon' then
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local j = Drawing.insert_point(drawing.points, Drawing.coord(x-16), Drawing.coord(y-drawing.y))
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drawing.pending = {mode=Current_drawing_mode, vertices={j}}
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elseif Current_drawing_mode == 'circle' then
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local j = Drawing.insert_point(drawing.points, Drawing.coord(x-16), Drawing.coord(y-drawing.y))
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drawing.pending = {mode=Current_drawing_mode, center=j}
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end
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Lines.current = drawing
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end
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function Drawing.keychord_pressed(chord)
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if chord == 'C-=' then
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Drawing_width = Drawing_width/Zoom
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Zoom = Zoom+0.5
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Drawing_width = Drawing_width*Zoom
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elseif chord == 'C--' then
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Drawing_width = Drawing_width/Zoom
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Zoom = Zoom-0.5
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Drawing_width = Drawing_width*Zoom
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elseif chord == 'C-0' then
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Drawing_width = Drawing_width/Zoom
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Zoom = 1.5
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Drawing_width = Drawing_width*Zoom
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elseif chord == 'escape' and love.mouse.isDown('1') then
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local drawing = Drawing.current_drawing()
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drawing.pending = {}
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elseif chord == 'C-f' and not love.mouse.isDown('1') then
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Current_drawing_mode = 'freehand'
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elseif chord == 'C-g' and not love.mouse.isDown('1') then
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Current_drawing_mode = 'polygon'
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elseif love.mouse.isDown('1') and chord == 'g' then
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Current_drawing_mode = 'polygon'
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local drawing = Drawing.current_drawing()
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if drawing.pending.mode == 'freehand' then
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drawing.pending.vertices = {Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)}
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elseif drawing.pending.mode == 'line' or drawing.pending.mode == 'manhattan' then
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if drawing.pending.vertices == nil then
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drawing.pending.vertices = {drawing.pending.p1}
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end
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elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then
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drawing.pending.vertices = {drawing.pending.center}
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end
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drawing.pending.mode = 'polygon'
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elseif love.mouse.isDown('1') and chord == 'p' and Current_drawing_mode == 'polygon' then
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local drawing = Drawing.current_drawing()
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local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
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local j = Drawing.insert_point(drawing.points, mx,my)
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table.insert(drawing.pending.vertices, j)
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elseif chord == 'C-c' and not love.mouse.isDown('1') then
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Current_drawing_mode = 'circle'
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elseif love.mouse.isDown('1') and chord == 'a' and Current_drawing_mode == 'circle' then
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local drawing = Drawing.current_drawing()
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drawing.pending.mode = 'arc'
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local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
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local j = Drawing.insert_point(drawing.points, mx,my)
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local center = drawing.points[drawing.pending.center]
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drawing.pending.radius = geom.dist(center.x,center.y, mx,my)
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drawing.pending.start_angle = geom.angle(center.x,center.y, mx,my)
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elseif love.mouse.isDown('1') and chord == 'c' then
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Current_drawing_mode = 'circle'
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local drawing = Drawing.current_drawing()
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if drawing.pending.mode == 'freehand' then
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drawing.pending.center = Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)
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elseif drawing.pending.mode == 'line' or drawing.pending.mode == 'manhattan' then
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drawing.pending.center = drawing.pending.p1
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elseif drawing.pending.mode == 'polygon' then
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drawing.pending.center = drawing.pending.vertices[1]
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end
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drawing.pending.mode = 'circle'
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elseif love.mouse.isDown('1') and chord == 'l' then
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Current_drawing_mode = 'line'
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local drawing = Drawing.current_drawing()
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if drawing.pending.mode == 'freehand' then
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drawing.pending.p1 = Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)
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elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then
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drawing.pending.p1 = drawing.pending.center
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elseif drawing.pending.mode == 'polygon' then
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drawing.pending.p1 = drawing.pending.vertices[1]
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end
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drawing.pending.mode = 'line'
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elseif chord == 'C-l' then
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Current_drawing_mode = 'line'
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local drawing,_,shape = Drawing.select_shape_at_mouse()
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if drawing then
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convert_line(drawing, shape)
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end
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elseif love.mouse.isDown('1') and chord == 'm' then
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Current_drawing_mode = 'manhattan'
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local drawing = Drawing.select_drawing_at_mouse()
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if drawing.pending.mode == 'freehand' then
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drawing.pending.p1 = Drawing.insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y)
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elseif drawing.pending.mode == 'line' then
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-- do nothing
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elseif drawing.pending.mode == 'polygon' then
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drawing.pending.p1 = drawing.pending.vertices[1]
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elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then
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drawing.pending.p1 = drawing.pending.center
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end
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drawing.pending.mode = 'manhattan'
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elseif chord == 'C-m' and not love.mouse.isDown('1') then
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Current_drawing_mode = 'manhattan'
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local drawing,_,shape = Drawing.select_shape_at_mouse()
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if drawing then
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convert_horvert(drawing, shape)
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end
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elseif chord == 'C-s' and not love.mouse.isDown('1') then
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local drawing,_,shape = Drawing.select_shape_at_mouse()
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if drawing then
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smoothen(shape)
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end
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elseif chord == 'C-v' and not love.mouse.isDown('1') then
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local drawing,_,p = Drawing.select_point_at_mouse()
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if drawing then
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Previous_drawing_mode = Current_drawing_mode
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Current_drawing_mode = 'move'
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drawing.pending = {mode=Current_drawing_mode, target_point=p}
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Lines.current = drawing
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end
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elseif love.mouse.isDown('1') and chord == 'v' then
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local drawing,_,p = Drawing.select_point_at_mouse()
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if drawing then
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Previous_drawing_mode = Current_drawing_mode
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Current_drawing_mode = 'move'
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drawing.pending = {mode=Current_drawing_mode, target_point=p}
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Lines.current = drawing
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end
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elseif chord == 'C-d' and not love.mouse.isDown('1') then
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local drawing,i,p = Drawing.select_point_at_mouse()
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if drawing then
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for _,shape in ipairs(drawing.shapes) do
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if Drawing.contains_point(shape, i) then
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if shape.mode == 'polygon' then
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local idx = table.find(shape.vertices, i)
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assert(idx)
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table.remove(shape.vertices, idx)
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if #shape.vertices < 3 then
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shape.mode = 'deleted'
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end
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else
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shape.mode = 'deleted'
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end
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end
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end
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drawing.points[i].deleted = true
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end
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local drawing,_,shape = Drawing.select_shape_at_mouse()
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if drawing then
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shape.mode = 'deleted'
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end
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elseif chord == 'C-h' and not love.mouse.isDown('1') then
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local drawing = Drawing.select_drawing_at_mouse()
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if drawing then
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drawing.show_help = true
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end
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elseif chord == 'escape' and not love.mouse.isDown('1') then
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for _,line in ipairs(Lines) do
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if line.mode == 'drawing' then
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line.show_help = false
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end
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end
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end
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end
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function Drawing.current_drawing()
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local x, y = love.mouse.getX(), love.mouse.getY()
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for _,drawing in ipairs(Lines) do
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if drawing.mode == 'drawing' then
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if y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width then
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return drawing
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end
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end
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end
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return nil
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end
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function Drawing.select_shape_at_mouse()
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for _,drawing in ipairs(Lines) do
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if drawing.mode == 'drawing' then
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local x, y = love.mouse.getX(), love.mouse.getY()
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if y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width then
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local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
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for i,shape in ipairs(drawing.shapes) do
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assert(shape)
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if geom.on_shape(mx,my, drawing, shape) then
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return drawing,i,shape
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end
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end
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end
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end
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end
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end
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function Drawing.select_point_at_mouse()
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for _,drawing in ipairs(Lines) do
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if drawing.mode == 'drawing' then
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local x, y = love.mouse.getX(), love.mouse.getY()
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if y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width then
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local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
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for i,point in ipairs(drawing.points) do
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assert(point)
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if Drawing.near(point, mx,my) then
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return drawing,i,point
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end
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end
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end
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end
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end
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end
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function Drawing.select_drawing_at_mouse()
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for _,drawing in ipairs(Lines) do
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if drawing.mode == 'drawing' then
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local x, y = love.mouse.getX(), love.mouse.getY()
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if y >= drawing.y and y < drawing.y + Drawing.pixels(drawing.h) and x >= 16 and x < 16+Drawing_width then
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return drawing
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end
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end
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end
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end
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function Drawing.contains_point(shape, p)
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if shape.mode == 'freehand' then
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-- not supported
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elseif shape.mode == 'line' or shape.mode == 'manhattan' then
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return shape.p1 == p or shape.p2 == p
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elseif shape.mode == 'polygon' then
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return table.find(shape.vertices, p)
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elseif shape.mode == 'circle' then
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return shape.center == p
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elseif shape.mode == 'arc' then
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return shape.center == p
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-- ugh, how to support angles
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elseif shape.mode == 'deleted' then
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-- already done
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else
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print(shape.mode)
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assert(false)
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end
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end
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function Drawing.convert_line(drawing, shape)
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-- Perhaps we should do a more sophisticated "simple linear regression"
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-- here:
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-- https://en.wikipedia.org/wiki/Linear_regression#Simple_and_multiple_linear_regression
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-- But this works well enough for close-to-linear strokes.
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assert(shape.mode == 'freehand')
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shape.mode = 'line'
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shape.p1 = insert_point(drawing.points, shape.points[1].x, shape.points[1].y)
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local n = #shape.points
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shape.p2 = insert_point(drawing.points, shape.points[n].x, shape.points[n].y)
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end
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-- turn a line either horizontal or vertical
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function Drawing.convert_horvert(drawing, shape)
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if shape.mode == 'freehand' then
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convert_line(shape)
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end
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assert(shape.mode == 'line')
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local p1 = drawing.points[shape.p1]
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local p2 = drawing.points[shape.p2]
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if math.abs(p1.x-p2.x) > math.abs(p1.y-p2.y) then
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p2.y = p1.y
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else
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p2.x = p1.x
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end
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end
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function Drawing.smoothen(shape)
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assert(shape.mode == 'freehand')
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for _=1,7 do
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for i=2,#shape.points-1 do
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local a = shape.points[i-1]
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local b = shape.points[i]
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local c = shape.points[i+1]
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b.x = (a.x + b.x + c.x)/3
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b.y = (a.y + b.y + c.y)/3
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end
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end
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end
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function Drawing.insert_point(points, x,y)
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for i,point in ipairs(points) do
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if Drawing.near(point, x,y) then
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return i
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end
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end
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table.insert(points, {x=x, y=y})
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return #points
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end
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function Drawing.near(point, x,y)
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local px,py = Drawing.pixels(x),Drawing.pixels(y)
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local cx,cy = Drawing.pixels(point.x), Drawing.pixels(point.y)
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return (cx-px)*(cx-px) + (cy-py)*(cy-py) < 16
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end
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function Drawing.draw_shape(left,top, drawing, shape)
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if shape.mode == 'freehand' then
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local prev = nil
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for _,point in ipairs(shape.points) do
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if prev then
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love.graphics.line(Drawing.pixels(prev.x)+left,Drawing.pixels(prev.y)+top, Drawing.pixels(point.x)+left,Drawing.pixels(point.y)+top)
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end
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prev = point
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end
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elseif shape.mode == 'line' or shape.mode == 'manhattan' then
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local p1 = drawing.points[shape.p1]
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local p2 = drawing.points[shape.p2]
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love.graphics.line(Drawing.pixels(p1.x)+left,Drawing.pixels(p1.y)+top, Drawing.pixels(p2.x)+left,Drawing.pixels(p2.y)+top)
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elseif shape.mode == 'polygon' then
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local prev = nil
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for _,point in ipairs(shape.vertices) do
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local curr = drawing.points[point]
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if prev then
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love.graphics.line(Drawing.pixels(prev.x)+left,Drawing.pixels(prev.y)+top, Drawing.pixels(curr.x)+left,Drawing.pixels(curr.y)+top)
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end
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prev = curr
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end
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-- close the loop
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local curr = drawing.points[shape.vertices[1]]
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love.graphics.line(Drawing.pixels(prev.x)+left,Drawing.pixels(prev.y)+top, Drawing.pixels(curr.x)+left,Drawing.pixels(curr.y)+top)
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elseif shape.mode == 'circle' then
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local center = drawing.points[shape.center]
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love.graphics.circle('line', Drawing.pixels(center.x)+left,Drawing.pixels(center.y)+top, Drawing.pixels(shape.radius))
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elseif shape.mode == 'arc' then
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local center = drawing.points[shape.center]
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love.graphics.arc('line', 'open', Drawing.pixels(center.x)+left,Drawing.pixels(center.y)+top, Drawing.pixels(shape.radius), shape.start_angle, shape.end_angle, 360)
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elseif shape.mode == 'deleted' then
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else
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print(shape.mode)
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assert(false)
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end
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end
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function Drawing.draw_pending_shape(left,top, drawing)
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local shape = drawing.pending
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if shape.mode == 'freehand' then
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Drawing.draw_shape(left,top, drawing, shape)
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elseif shape.mode == 'line' then
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local p1 = drawing.points[shape.p1]
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local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
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if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then
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return
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end
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love.graphics.line(Drawing.pixels(p1.x)+left,Drawing.pixels(p1.y)+top, Drawing.pixels(mx)+left,Drawing.pixels(my)+top)
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elseif shape.mode == 'manhattan' then
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local p1 = drawing.points[shape.p1]
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local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
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if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then
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return
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end
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if math.abs(mx-p1.x) > math.abs(my-p1.y) then
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love.graphics.line(Drawing.pixels(p1.x)+left,Drawing.pixels(p1.y)+top, Drawing.pixels(mx)+left,Drawing.pixels(p1.y)+top)
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else
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love.graphics.line(Drawing.pixels(p1.x)+left,Drawing.pixels(p1.y)+top, Drawing.pixels(p1.x)+left,Drawing.pixels(my)+top)
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|
end
|
|
elseif shape.mode == 'polygon' then
|
|
-- don't close the loop on a pending polygon
|
|
local prev = nil
|
|
for _,point in ipairs(shape.vertices) do
|
|
local curr = drawing.points[point]
|
|
if prev then
|
|
love.graphics.line(Drawing.pixels(prev.x)+left,Drawing.pixels(prev.y)+top, Drawing.pixels(curr.x)+left,Drawing.pixels(curr.y)+top)
|
|
end
|
|
prev = curr
|
|
end
|
|
love.graphics.line(Drawing.pixels(prev.x)+left,Drawing.pixels(prev.y)+top, love.mouse.getX(),love.mouse.getY())
|
|
elseif shape.mode == 'circle' then
|
|
local center = drawing.points[shape.center]
|
|
local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
|
|
if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then
|
|
return
|
|
end
|
|
local cx,cy = Drawing.pixels(center.x)+left, Drawing.pixels(center.y)+top
|
|
love.graphics.circle('line', cx,cy, geom.dist(cx,cy, love.mouse.getX(),love.mouse.getY()))
|
|
elseif shape.mode == 'arc' then
|
|
local center = drawing.points[shape.center]
|
|
local mx,my = Drawing.coord(love.mouse.getX()-16), Drawing.coord(love.mouse.getY()-drawing.y)
|
|
if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then
|
|
return
|
|
end
|
|
shape.end_angle = geom.angle_with_hint(center.x,center.y, mx,my, shape.end_angle)
|
|
local cx,cy = Drawing.pixels(center.x)+left, Drawing.pixels(center.y)+top
|
|
love.graphics.arc('line', 'open', cx,cy, Drawing.pixels(shape.radius), shape.start_angle, shape.end_angle, 360)
|
|
end
|
|
end
|
|
|
|
function Drawing.pixels(n) -- parts to pixels
|
|
return n*Drawing_width/256
|
|
end
|
|
function Drawing.coord(n) -- pixels to parts
|
|
return math.floor(n*256/Drawing_width)
|
|
end
|
|
|
|
function table.find(h, x)
|
|
for k,v in pairs(h) do
|
|
if v == x then
|
|
return k
|
|
end
|
|
end
|
|
end
|
|
|
|
return Drawing
|