diff options
Diffstat (limited to 'drawing.lua')
| -rw-r--r-- | drawing.lua | 745 |
1 files changed, 745 insertions, 0 deletions
diff --git a/drawing.lua b/drawing.lua new file mode 100644 index 0000000..0343f85 --- /dev/null +++ b/drawing.lua @@ -0,0 +1,745 @@ +-- primitives for editing drawings +Drawing = {} +require 'drawing_tests' + +-- All drawings span 100% of some conceptual 'page width' and divide it up +-- into 256 parts. +function Drawing.draw(State, line_index, y) + local line = State.lines[line_index] + local line_cache = State.line_cache[line_index] + line_cache.starty = y + local pmx,pmy = App.mouse_x(), App.mouse_y() + if pmx < State.right and pmy > line_cache.starty and pmy < line_cache.starty+Drawing.pixels(line.h, State.width) then + App.color(Icon_color) + love.graphics.rectangle('line', State.left,line_cache.starty, State.width,Drawing.pixels(line.h, State.width)) + if icon[State.current_drawing_mode] then + icon[State.current_drawing_mode](State.right-22, line_cache.starty+4) + else + icon[State.previous_drawing_mode](State.right-22, line_cache.starty+4) + end + + if App.mouse_down(1) and love.keyboard.isDown('h') then + draw_help_with_mouse_pressed(State, line_index) + return + end + end + + if line.show_help then + draw_help_without_mouse_pressed(State, line_index) + return + end + + local mx = Drawing.coord(pmx-State.left, State.width) + local my = Drawing.coord(pmy-line_cache.starty, State.width) + + for _,shape in ipairs(line.shapes) do + assert(shape) + if geom.on_shape(mx,my, line, shape) then + App.color(Focus_stroke_color) + else + App.color(Stroke_color) + end + Drawing.draw_shape(line, shape, line_cache.starty, State.left,State.right) + end + + local function px(x) return Drawing.pixels(x, State.width)+State.left end + local function py(y) return Drawing.pixels(y, State.width)+line_cache.starty end + for i,p in ipairs(line.points) do + if p.deleted == nil then + if Drawing.near(p, mx,my, State.width) then + App.color(Focus_stroke_color) + love.graphics.circle('line', px(p.x),py(p.y), Same_point_distance) + else + App.color(Stroke_color) + love.graphics.circle('fill', px(p.x),py(p.y), 2) + end + if p.name then + -- TODO: clip + local x,y = px(p.x)+5, py(p.y)+5 + love.graphics.print(p.name, x,y) + if State.current_drawing_mode == 'name' and i == line.pending.target_point then + -- create a faint red box for the name + App.color(Current_name_background_color) + local name_text + -- TODO: avoid computing name width on every repaint + if p.name == '' then + name_text = State.em + else + name_text = App.newText(love.graphics.getFont(), p.name) + end + love.graphics.rectangle('fill', x,y, App.width(name_text), State.line_height) + end + end + end + end + App.color(Current_stroke_color) + Drawing.draw_pending_shape(line, line_cache.starty, State.left,State.right) +end + +function Drawing.draw_shape(drawing, shape, top, left,right) + local width = right-left + local function px(x) return Drawing.pixels(x, width)+left end + local function py(y) return Drawing.pixels(y, width)+top end + if shape.mode == 'freehand' then + local prev = nil + for _,point in ipairs(shape.points) do + if prev then + love.graphics.line(px(prev.x),py(prev.y), px(point.x),py(point.y)) + end + prev = point + end + elseif shape.mode == 'line' or shape.mode == 'manhattan' then + local p1 = drawing.points[shape.p1] + local p2 = drawing.points[shape.p2] + love.graphics.line(px(p1.x),py(p1.y), px(p2.x),py(p2.y)) + elseif shape.mode == 'polygon' or shape.mode == 'rectangle' or shape.mode == 'square' then + local prev = nil + for _,point in ipairs(shape.vertices) do + local curr = drawing.points[point] + if prev then + love.graphics.line(px(prev.x),py(prev.y), px(curr.x),py(curr.y)) + end + prev = curr + end + -- close the loop + local curr = drawing.points[shape.vertices[1]] + love.graphics.line(px(prev.x),py(prev.y), px(curr.x),py(curr.y)) + elseif shape.mode == 'circle' then + -- TODO: clip + local center = drawing.points[shape.center] + love.graphics.circle('line', px(center.x),py(center.y), Drawing.pixels(shape.radius, width)) + elseif shape.mode == 'arc' then + local center = drawing.points[shape.center] + love.graphics.arc('line', 'open', px(center.x),py(center.y), Drawing.pixels(shape.radius, width), shape.start_angle, shape.end_angle, 360) + elseif shape.mode == 'deleted' then + -- ignore + else + print(shape.mode) + assert(false) + end +end + +function Drawing.draw_pending_shape(drawing, top, left,right) + local width = right-left + local pmx,pmy = App.mouse_x(), App.mouse_y() + local function px(x) return Drawing.pixels(x, width)+left end + local function py(y) return Drawing.pixels(y, width)+top end + local mx = Drawing.coord(pmx-left, width) + local my = Drawing.coord(pmy-top, width) + -- recreate pixels from coords to precisely mimic how the drawing will look + -- after mouse_released + pmx,pmy = px(mx), py(my) + local shape = drawing.pending + if shape.mode == nil then + -- nothing pending + elseif shape.mode == 'freehand' then + local shape_copy = deepcopy(shape) + Drawing.smoothen(shape_copy) + Drawing.draw_shape(drawing, shape_copy, top, left,right) + elseif shape.mode == 'line' then + if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then + return + end + local p1 = drawing.points[shape.p1] + love.graphics.line(px(p1.x),py(p1.y), pmx,pmy) + elseif shape.mode == 'manhattan' then + if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then + return + end + local p1 = drawing.points[shape.p1] + if math.abs(mx-p1.x) > math.abs(my-p1.y) then + love.graphics.line(px(p1.x),py(p1.y), pmx, py(p1.y)) + else + love.graphics.line(px(p1.x),py(p1.y), px(p1.x),pmy) + 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(px(prev.x),py(prev.y), px(curr.x),py(curr.y)) + end + prev = curr + end + love.graphics.line(px(prev.x),py(prev.y), pmx,pmy) + elseif shape.mode == 'rectangle' then + local first = drawing.points[shape.vertices[1]] + if #shape.vertices == 1 then + love.graphics.line(px(first.x),py(first.y), pmx,pmy) + return + end + local second = drawing.points[shape.vertices[2]] + local thirdx,thirdy, fourthx,fourthy = Drawing.complete_rectangle(first.x,first.y, second.x,second.y, mx,my) + love.graphics.line(px(first.x),py(first.y), px(second.x),py(second.y)) + love.graphics.line(px(second.x),py(second.y), px(thirdx),py(thirdy)) + love.graphics.line(px(thirdx),py(thirdy), px(fourthx),py(fourthy)) + love.graphics.line(px(fourthx),py(fourthy), px(first.x),py(first.y)) + elseif shape.mode == 'square' then + local first = drawing.points[shape.vertices[1]] + if #shape.vertices == 1 then + love.graphics.line(px(first.x),py(first.y), pmx,pmy) + return + end + local second = drawing.points[shape.vertices[2]] + local thirdx,thirdy, fourthx,fourthy = Drawing.complete_square(first.x,first.y, second.x,second.y, mx,my) + love.graphics.line(px(first.x),py(first.y), px(second.x),py(second.y)) + love.graphics.line(px(second.x),py(second.y), px(thirdx),py(thirdy)) + love.graphics.line(px(thirdx),py(thirdy), px(fourthx),py(fourthy)) + love.graphics.line(px(fourthx),py(fourthy), px(first.x),py(first.y)) + elseif shape.mode == 'circle' then + local center = drawing.points[shape.center] + if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then + return + end + local cx,cy = px(center.x), py(center.y) + love.graphics.circle('line', cx,cy, geom.dist(cx,cy, App.mouse_x(),App.mouse_y())) + elseif shape.mode == 'arc' then + local center = drawing.points[shape.center] + 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 = px(center.x), py(center.y) + love.graphics.arc('line', 'open', cx,cy, Drawing.pixels(shape.radius, width), shape.start_angle, shape.end_angle, 360) + elseif shape.mode == 'move' then + -- nothing pending; changes are immediately committed + elseif shape.mode == 'name' then + -- nothing pending; changes are immediately committed + else + print(shape.mode) + assert(false) + end +end + +function Drawing.in_drawing(drawing, line_cache, x,y, left,right) + if line_cache.starty == nil then return false end -- outside current page + local width = right-left + return y >= line_cache.starty and y < line_cache.starty + Drawing.pixels(drawing.h, width) and x >= left and x < right +end + +function Drawing.mouse_pressed(State, drawing_index, x,y, mouse_button) + local drawing = State.lines[drawing_index] + local line_cache = State.line_cache[drawing_index] + local cx = Drawing.coord(x-State.left, State.width) + local cy = Drawing.coord(y-line_cache.starty, State.width) + if State.current_drawing_mode == 'freehand' then + drawing.pending = {mode=State.current_drawing_mode, points={{x=cx, y=cy}}} + elseif State.current_drawing_mode == 'line' or State.current_drawing_mode == 'manhattan' then + local j = Drawing.find_or_insert_point(drawing.points, cx, cy, State.width) + drawing.pending = {mode=State.current_drawing_mode, p1=j} + elseif State.current_drawing_mode == 'polygon' or State.current_drawing_mode == 'rectangle' or State.current_drawing_mode == 'square' then + local j = Drawing.find_or_insert_point(drawing.points, cx, cy, State.width) + drawing.pending = {mode=State.current_drawing_mode, vertices={j}} + elseif State.current_drawing_mode == 'circle' then + local j = Drawing.find_or_insert_point(drawing.points, cx, cy, State.width) + drawing.pending = {mode=State.current_drawing_mode, center=j} + elseif State.current_drawing_mode == 'move' then + -- all the action is in mouse_released + elseif State.current_drawing_mode == 'name' then + -- nothing + else + print(State.current_drawing_mode) + assert(false) + end +end + +-- a couple of operations on drawings need to constantly check the state of the mouse +function Drawing.update(State) + if State.lines.current_drawing == nil then return end + local drawing = State.lines.current_drawing + local line_cache = State.line_cache[State.lines.current_drawing_index] + assert(drawing.mode == 'drawing') + local pmx, pmy = App.mouse_x(), App.mouse_y() + local mx = Drawing.coord(pmx-State.left, State.width) + local my = Drawing.coord(pmy-line_cache.starty, State.width) + if App.mouse_down(1) then + if Drawing.in_drawing(drawing, line_cache, pmx,pmy, State.left,State.right) then + if drawing.pending.mode == 'freehand' then + table.insert(drawing.pending.points, {x=mx, y=my}) + elseif drawing.pending.mode == 'move' then + drawing.pending.target_point.x = mx + drawing.pending.target_point.y = my + Drawing.relax_constraints(drawing, drawing.pending.target_point_index) + end + end + elseif State.current_drawing_mode == 'move' then + if Drawing.in_drawing(drawing, line_cache, pmx, pmy, State.left,State.right) then + drawing.pending.target_point.x = mx + drawing.pending.target_point.y = my + Drawing.relax_constraints(drawing, drawing.pending.target_point_index) + end + else + -- do nothing + end +end + +function Drawing.relax_constraints(drawing, p) + for _,shape in ipairs(drawing.shapes) do + if shape.mode == 'manhattan' then + if shape.p1 == p then + shape.mode = 'line' + elseif shape.p2 == p then + shape.mode = 'line' + end + elseif shape.mode == 'rectangle' or shape.mode == 'square' then + for _,v in ipairs(shape.vertices) do + if v == p then + shape.mode = 'polygon' + end + end + end + end +end + +function Drawing.mouse_released(State, x,y, mouse_button) + if State.current_drawing_mode == 'move' then + State.current_drawing_mode = State.previous_drawing_mode + State.previous_drawing_mode = nil + if State.lines.current_drawing then + State.lines.current_drawing.pending = {} + State.lines.current_drawing = nil + end + elseif State.lines.current_drawing then + local drawing = State.lines.current_drawing + local line_cache = State.line_cache[State.lines.current_drawing_index] + if drawing.pending then + if drawing.pending.mode == nil then + -- nothing pending + elseif drawing.pending.mode == 'freehand' then + -- the last point added during update is good enough + Drawing.smoothen(drawing.pending) + table.insert(drawing.shapes, drawing.pending) + elseif drawing.pending.mode == 'line' then + local mx,my = Drawing.coord(x-State.left, State.width), Drawing.coord(y-line_cache.starty, State.width) + if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then + drawing.pending.p2 = Drawing.find_or_insert_point(drawing.points, mx,my, State.width) + table.insert(drawing.shapes, drawing.pending) + end + elseif drawing.pending.mode == 'manhattan' then + local p1 = drawing.points[drawing.pending.p1] + local mx,my = Drawing.coord(x-State.left, State.width), Drawing.coord(y-line_cache.starty, State.width) + if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then + if math.abs(mx-p1.x) > math.abs(my-p1.y) then + drawing.pending.p2 = Drawing.find_or_insert_point(drawing.points, mx, p1.y, State.width) + else + drawing.pending.p2 = Drawing.find_or_insert_point(drawing.points, p1.x, my, State.width) + end + local p2 = drawing.points[drawing.pending.p2] + App.mouse_move(State.left+Drawing.pixels(p2.x, State.width), line_cache.starty+Drawing.pixels(p2.y, State.width)) + table.insert(drawing.shapes, drawing.pending) + end + elseif drawing.pending.mode == 'polygon' then + local mx,my = Drawing.coord(x-State.left, State.width), Drawing.coord(y-line_cache.starty, State.width) + if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then + table.insert(drawing.pending.vertices, Drawing.find_or_insert_point(drawing.points, mx,my, State.width)) + table.insert(drawing.shapes, drawing.pending) + end + elseif drawing.pending.mode == 'rectangle' then + assert(#drawing.pending.vertices <= 2) + if #drawing.pending.vertices == 2 then + local mx,my = Drawing.coord(x-State.left, State.width), Drawing.coord(y-line_cache.starty, State.width) + if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then + local first = drawing.points[drawing.pending.vertices[1]] + local second = drawing.points[drawing.pending.vertices[2]] + local thirdx,thirdy, fourthx,fourthy = Drawing.complete_rectangle(first.x,first.y, second.x,second.y, mx,my) + table.insert(drawing.pending.vertices, Drawing.find_or_insert_point(drawing.points, thirdx,thirdy, State.width)) + table.insert(drawing.pending.vertices, Drawing.find_or_insert_point(drawing.points, fourthx,fourthy, State.width)) + table.insert(drawing.shapes, drawing.pending) + end + else + -- too few points; draw nothing + end + elseif drawing.pending.mode == 'square' then + assert(#drawing.pending.vertices <= 2) + if #drawing.pending.vertices == 2 then + local mx,my = Drawing.coord(x-State.left, State.width), Drawing.coord(y-line_cache.starty, State.width) + if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then + local first = drawing.points[drawing.pending.vertices[1]] + local second = drawing.points[drawing.pending.vertices[2]] + local thirdx,thirdy, fourthx,fourthy = Drawing.complete_square(first.x,first.y, second.x,second.y, mx,my) + table.insert(drawing.pending.vertices, Drawing.find_or_insert_point(drawing.points, thirdx,thirdy, State.width)) + table.insert(drawing.pending.vertices, Drawing.find_or_insert_point(drawing.points, fourthx,fourthy, State.width)) + table.insert(drawing.shapes, drawing.pending) + end + end + elseif drawing.pending.mode == 'circle' then + local mx,my = Drawing.coord(x-State.left, State.width), Drawing.coord(y-line_cache.starty, State.width) + if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then + local center = drawing.points[drawing.pending.center] + drawing.pending.radius = round(geom.dist(center.x,center.y, mx,my)) + table.insert(drawing.shapes, drawing.pending) + end + elseif drawing.pending.mode == 'arc' then + local mx,my = Drawing.coord(x-State.left, State.width), Drawing.coord(y-line_cache.starty, State.width) + if mx >= 0 and mx < 256 and my >= 0 and my < drawing.h then + local center = drawing.points[drawing.pending.center] + drawing.pending.end_angle = geom.angle_with_hint(center.x,center.y, mx,my, drawing.pending.end_angle) + table.insert(drawing.shapes, drawing.pending) + end + elseif drawing.pending.mode == 'name' then + -- drop it + else + print(drawing.pending.mode) + assert(false) + end + State.lines.current_drawing.pending = {} + State.lines.current_drawing = nil + end + end +end + +function Drawing.keychord_pressed(State, chord) + if chord == 'C-p' and not App.mouse_down(1) then + State.current_drawing_mode = 'freehand' + elseif App.mouse_down(1) and chord == 'l' then + State.current_drawing_mode = 'line' + local _,drawing = Drawing.current_drawing(State) + if drawing.pending.mode == 'freehand' then + drawing.pending.p1 = Drawing.find_or_insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y, State.width) + elseif drawing.pending.mode == 'polygon' or drawing.pending.mode == 'rectangle' or drawing.pending.mode == 'square' then + drawing.pending.p1 = drawing.pending.vertices[1] + elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then + drawing.pending.p1 = drawing.pending.center + end + drawing.pending.mode = 'line' + elseif chord == 'C-l' and not App.mouse_down(1) then + State.current_drawing_mode = 'line' + elseif App.mouse_down(1) and chord == 'm' then + State.current_drawing_mode = 'manhattan' + local drawing = Drawing.select_drawing_at_mouse(State) + if drawing.pending.mode == 'freehand' then + drawing.pending.p1 = Drawing.find_or_insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y, State.width) + elseif drawing.pending.mode == 'line' then + -- do nothing + elseif drawing.pending.mode == 'polygon' or drawing.pending.mode == 'rectangle' or drawing.pending.mode == 'square' then + drawing.pending.p1 = drawing.pending.vertices[1] + elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then + drawing.pending.p1 = drawing.pending.center + end + drawing.pending.mode = 'manhattan' + elseif chord == 'C-m' and not App.mouse_down(1) then + State.current_drawing_mode = 'manhattan' + elseif chord == 'C-g' and not App.mouse_down(1) then + State.current_drawing_mode = 'polygon' + elseif App.mouse_down(1) and chord == 'g' then + State.current_drawing_mode = 'polygon' + local _,drawing = Drawing.current_drawing(State) + if drawing.pending.mode == 'freehand' then + drawing.pending.vertices = {Drawing.find_or_insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y, State.width)} + elseif drawing.pending.mode == 'line' or drawing.pending.mode == 'manhattan' then + if drawing.pending.vertices == nil then + drawing.pending.vertices = {drawing.pending.p1} + end + elseif drawing.pending.mode == 'rectangle' or drawing.pending.mode == 'square' then + -- reuse existing vertices + elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then + drawing.pending.vertices = {drawing.pending.center} + end + drawing.pending.mode = 'polygon' + elseif chord == 'C-r' and not App.mouse_down(1) then + State.current_drawing_mode = 'rectangle' + elseif App.mouse_down(1) and chord == 'r' then + State.current_drawing_mode = 'rectangle' + local _,drawing = Drawing.current_drawing(State) + if drawing.pending.mode == 'freehand' then + drawing.pending.vertices = {Drawing.find_or_insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y, State.width)} + elseif drawing.pending.mode == 'line' or drawing.pending.mode == 'manhattan' then + if drawing.pending.vertices == nil then + drawing.pending.vertices = {drawing.pending.p1} + end + elseif drawing.pending.mode == 'polygon' or drawing.pending.mode == 'square' then + -- reuse existing (1-2) vertices + elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then + drawing.pending.vertices = {drawing.pending.center} + end + drawing.pending.mode = 'rectangle' + elseif chord == 'C-s' and not App.mouse_down(1) then + State.current_drawing_mode = 'square' + elseif App.mouse_down(1) and chord == 's' then + State.current_drawing_mode = 'square' + local _,drawing = Drawing.current_drawing(State) + if drawing.pending.mode == 'freehand' then + drawing.pending.vertices = {Drawing.find_or_insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y, State.width)} + elseif drawing.pending.mode == 'line' or drawing.pending.mode == 'manhattan' then + if drawing.pending.vertices == nil then + drawing.pending.vertices = {drawing.pending.p1} + end + elseif drawing.pending.mode == 'polygon' then + while #drawing.pending.vertices > 2 do + table.remove(drawing.pending.vertices) + end + elseif drawing.pending.mode == 'rectangle' then + -- reuse existing (1-2) vertices + elseif drawing.pending.mode == 'circle' or drawing.pending.mode == 'arc' then + drawing.pending.vertices = {drawing.pending.center} + end + drawing.pending.mode = 'square' + elseif App.mouse_down(1) and chord == 'p' and State.current_drawing_mode == 'polygon' then + local _,drawing,line_cache = Drawing.current_drawing(State) + local mx,my = Drawing.coord(App.mouse_x()-State.left, State.width), Drawing.coord(App.mouse_y()-line_cache.starty, State.width) + local j = Drawing.find_or_insert_point(drawing.points, mx,my, State.width) + table.insert(drawing.pending.vertices, j) + elseif App.mouse_down(1) and chord == 'p' and (State.current_drawing_mode == 'rectangle' or State.current_drawing_mode == 'square') then + local _,drawing,line_cache = Drawing.current_drawing(State) + local mx,my = Drawing.coord(App.mouse_x()-State.left, State.width), Drawing.coord(App.mouse_y()-line_cache.starty, State.width) + local j = Drawing.find_or_insert_point(drawing.points, mx,my, State.width) + while #drawing.pending.vertices >= 2 do + table.remove(drawing.pending.vertices) + end + table.insert(drawing.pending.vertices, j) + elseif chord == 'C-o' and not App.mouse_down(1) then + State.current_drawing_mode = 'circle' + elseif App.mouse_down(1) and chord == 'a' and State.current_drawing_mode == 'circle' then + local _,drawing,line_cache = Drawing.current_drawing(State) + drawing.pending.mode = 'arc' + local mx,my = Drawing.coord(App.mouse_x()-State.left, State.width), Drawing.coord(App.mouse_y()-line_cache.starty, State.width) + local center = drawing.points[drawing.pending.center] + drawing.pending.radius = round(geom.dist(center.x,center.y, mx,my)) + drawing.pending.start_angle = geom.angle(center.x,center.y, mx,my) + elseif App.mouse_down(1) and chord == 'o' then + State.current_drawing_mode = 'circle' + local _,drawing = Drawing.current_drawing(State) + if drawing.pending.mode == 'freehand' then + drawing.pending.center = Drawing.find_or_insert_point(drawing.points, drawing.pending.points[1].x, drawing.pending.points[1].y, State.width) + elseif drawing.pending.mode == 'line' or drawing.pending.mode == 'manhattan' then + drawing.pending.center = drawing.pending.p1 + elseif drawing.pending.mode == 'polygon' or drawing.pending.mode == 'rectangle' or drawing.pending.mode == 'square' then + drawing.pending.center = drawing.pending.vertices[1] + end + drawing.pending.mode = 'circle' + elseif chord == 'C-u' and not App.mouse_down(1) then + local drawing_index,drawing,line_cache,i,p = Drawing.select_point_at_mouse(State) + if drawing then + if State.previous_drawing_mode == nil then + State.previous_drawing_mode = State.current_drawing_mode + end + State.current_drawing_mode = 'move' + drawing.pending = {mode=State.current_drawing_mode, target_point=p, target_point_index=i} + State.lines.current_drawing_index = drawing_index + State.lines.current_drawing = drawing + end + elseif chord == 'C-n' and not App.mouse_down(1) then + local drawing_index,drawing,line_cache,point_index,p = Drawing.select_point_at_mouse(State) + if drawing then + if State.previous_drawing_mode == nil then + -- don't clobber + State.previous_drawing_mode = State.current_drawing_mode + end + State.current_drawing_mode = 'name' + p.name = '' + drawing.pending = {mode=State.current_drawing_mode, target_point=point_index} + State.lines.current_drawing_index = drawing_index + State.lines.current_drawing = drawing + end + elseif chord == 'C-d' and not App.mouse_down(1) then + local _,drawing,_,i,p = Drawing.select_point_at_mouse(State) + if drawing then + for _,shape in ipairs(drawing.shapes) do + if Drawing.contains_point(shape, i) then + if shape.mode == 'polygon' then + local idx = table.find(shape.vertices, i) + assert(idx) + table.remove(shape.vertices, idx) + if #shape.vertices < 3 then + shape.mode = 'deleted' + end + else + shape.mode = 'deleted' + end + end + end + drawing.points[i].deleted = true + end + local drawing,_,_,shape = Drawing.select_shape_at_mouse(State) + if drawing then + shape.mode = 'deleted' + end + elseif chord == 'C-h' and not App.mouse_down(1) then + local drawing = Drawing.select_drawing_at_mouse(State) + if drawing then + drawing.show_help = true + end + elseif chord == 'escape' and App.mouse_down(1) then + local _,drawing = Drawing.current_drawing(State) + drawing.pending = {} + end +end + +function Drawing.complete_rectangle(firstx,firsty, secondx,secondy, x,y) + if firstx == secondx then + return x,secondy, x,firsty + end + if firsty == secondy then + return secondx,y, firstx,y + end + local first_slope = (secondy-firsty)/(secondx-firstx) + -- slope of second edge: + -- -1/first_slope + -- equation of line containing the second edge: + -- y-secondy = -1/first_slope*(x-secondx) + -- => 1/first_slope*x + y + (- secondy - secondx/first_slope) = 0 + -- now we want to find the point on this line that's closest to the mouse pointer. + -- https://en.wikipedia.org/wiki/Distance_from_a_point_to_a_line#Line_defined_by_an_equation + local a = 1/first_slope + local c = -secondy - secondx/first_slope + local thirdx = round(((x-a*y) - a*c) / (a*a + 1)) + local thirdy = round((a*(-x + a*y) - c) / (a*a + 1)) + -- slope of third edge = first_slope + -- equation of line containing third edge: + -- y - thirdy = first_slope*(x-thirdx) + -- => -first_slope*x + y + (-thirdy + thirdx*first_slope) = 0 + -- now we want to find the point on this line that's closest to the first point + local a = -first_slope + local c = -thirdy + thirdx*first_slope + local fourthx = round(((firstx-a*firsty) - a*c) / (a*a + 1)) + local fourthy = round((a*(-firstx + a*firsty) - c) / (a*a + 1)) + return thirdx,thirdy, fourthx,fourthy +end + +function Drawing.complete_square(firstx,firsty, secondx,secondy, x,y) + -- use x,y only to decide which side of the first edge to complete the square on + local deltax = secondx-firstx + local deltay = secondy-firsty + local thirdx = secondx+deltay + local thirdy = secondy-deltax + if not geom.same_side(firstx,firsty, secondx,secondy, thirdx,thirdy, x,y) then + deltax = -deltax + deltay = -deltay + thirdx = secondx+deltay + thirdy = secondy-deltax + end + local fourthx = firstx+deltay + local fourthy = firsty-deltax + return thirdx,thirdy, fourthx,fourthy +end + +function Drawing.current_drawing(State) + local x, y = App.mouse_x(), App.mouse_y() + for drawing_index,drawing in ipairs(State.lines) do + if drawing.mode == 'drawing' then + local line_cache = State.line_cache[drawing_index] + if Drawing.in_drawing(drawing, line_cache, x,y, State.left,State.right) then + return drawing_index,drawing,line_cache + end + end + end + return nil +end + +function Drawing.select_shape_at_mouse(State) + for drawing_index,drawing in ipairs(State.lines) do + if drawing.mode == 'drawing' then + local x, y = App.mouse_x(), App.mouse_y() + local line_cache = State.line_cache[drawing_index] + if Drawing.in_drawing(drawing, line_cache, x,y, State.left,State.right) then + local mx,my = Drawing.coord(x-State.left, State.width), Drawing.coord(y-line_cache.starty, State.width) + for i,shape in ipairs(drawing.shapes) do + assert(shape) + if geom.on_shape(mx,my, drawing, shape) then + return drawing,line_cache,i,shape + end + end + end + end + end +end + +function Drawing.select_point_at_mouse(State) + for drawing_index,drawing in ipairs(State.lines) do + if drawing.mode == 'drawing' then + local x, y = App.mouse_x(), App.mouse_y() + local line_cache = State.line_cache[drawing_index] + if Drawing.in_drawing(drawing, line_cache, x,y, State.left,State.right) then + local mx,my = Drawing.coord(x-State.left, State.width), Drawing.coord(y-line_cache.starty, State.width) + for i,point in ipairs(drawing.points) do + assert(point) + if Drawing.near(point, mx,my, State.width) then + return drawing_index,drawing,line_cache,i,point + end + end + end + end + end +end + +function Drawing.select_drawing_at_mouse(State) + for drawing_index,drawing in ipairs(State.lines) do + if drawing.mode == 'drawing' then + local x, y = App.mouse_x(), App.mouse_y() + local line_cache = State.line_cache[drawing_index] + if Drawing.in_drawing(drawing, line_cache, x,y, State.left,State.right) then + return drawing + end + end + end +end + +function Drawing.contains_point(shape, p) + if shape.mode == 'freehand' then + -- not supported + elseif shape.mode == 'line' or shape.mode == 'manhattan' then + return shape.p1 == p or shape.p2 == p + elseif shape.mode == 'polygon' or shape.mode == 'rectangle' or shape.mode == 'square' then + return table.find(shape.vertices, p) + elseif shape.mode == 'circle' then + return shape.center == p + elseif shape.mode == 'arc' then + return shape.center == p + -- ugh, how to support angles + elseif shape.mode == 'deleted' then + -- already done + else + print(shape.mode) + assert(false) + end +end + +function Drawing.smoothen(shape) + assert(shape.mode == 'freehand') + for _=1,7 do + for i=2,#shape.points-1 do + local a = shape.points[i-1] + local b = shape.points[i] + local c = shape.points[i+1] + b.x = round((a.x + b.x + c.x)/3) + b.y = round((a.y + b.y + c.y)/3) + end + end +end + +function round(num) + return math.floor(num+.5) +end + +function Drawing.find_or_insert_point(points, x,y, width) + -- check if UI would snap the two points together + for i,point in ipairs(points) do + if Drawing.near(point, x,y, width) then + return i + end + end + table.insert(points, {x=x, y=y}) + return #points +end + +function Drawing.near(point, x,y, width) + local px,py = Drawing.pixels(x, width),Drawing.pixels(y, width) + local cx,cy = Drawing.pixels(point.x, width), Drawing.pixels(point.y, width) + return (cx-px)*(cx-px) + (cy-py)*(cy-py) < Same_point_distance*Same_point_distance +end + +function Drawing.pixels(n, width) -- parts to pixels + return math.floor(n*width/256) +end +function Drawing.coord(n, width) -- pixels to parts + return math.floor(n*256/width) +end + +function table.find(h, x) + for k,v in pairs(h) do + if v == x then + return k + end + end +end |