package uix import ( "git.kirsle.net/apps/doodle/pkg/drawtool" "git.kirsle.net/apps/doodle/pkg/level" "git.kirsle.net/go/render" "git.kirsle.net/go/render/event" "git.kirsle.net/go/ui" ) // Modified returns whether the canvas has been modified since it was last // loaded. Methods like Load and LoadFile will set modified to false, and // commitStroke sets it to true. func (w *Canvas) Modified() bool { return w.modified } // SetModified sets the modified bit on the canvas. func (w *Canvas) SetModified(v bool) { w.modified = v } // commitStroke is the common function that applies a stroke the user is // actively drawing onto the canvas. This is for Edit Mode. func (w *Canvas) commitStroke(tool drawtool.Tool, addHistory bool) { if w.currentStroke == nil { // nothing to commit return } // Zoom the stroke coordinates (this modifies the pointer) zStroke := w.ZoomStroke(w.currentStroke) _ = zStroke // Mark the canvas as modified. w.modified = true var ( deleting = w.currentStroke.Shape == drawtool.Eraser dedupe = map[render.Point]interface{}{} // don't revisit the same point twice // Helper functions to set pixels on the level while storing the original // value of any pixel being replaced. set = func(pt render.Point, sw *level.Swatch) { // Take note of what pixel was originally here before we change it. if swatch, err := w.chunks.Get(pt); err == nil { if _, ok := dedupe[pt]; !ok { w.currentStroke.OriginalPoints[pt] = swatch dedupe[pt] = nil } } if deleting { w.chunks.Delete(pt) } else if sw != nil { w.chunks.Set(pt, sw) } else { panic("Canvas.commitStroke.set: current stroke has no level.Swatch in ExtraData") } } // Rects: read existing pixels first, then write new pixels readRect = func(rect render.Rect) { for pt := range w.chunks.IterViewport(rect) { point := pt.Point() if _, ok := dedupe[point]; !ok { w.currentStroke.OriginalPoints[pt.Point()] = pt.Swatch dedupe[point] = nil } } } setRect = func(rect render.Rect, sw *level.Swatch) { if deleting { w.chunks.DeleteRect(rect) } else if sw != nil { w.chunks.SetRect(rect, sw) } else { panic("Canvas.commitStroke.setRect: current stroke has no level.Swatch in ExtraData") } } ) var swatch *level.Swatch if v, ok := w.currentStroke.ExtraData.(*level.Swatch); ok { swatch = v } if w.currentStroke.Thickness > 0 { // Eraser Tool only: record which pixels will be blown away by this. // This is SLOW for thick (rect-based) lines, but eraser tool must have it. if deleting { for rect := range w.currentStroke.IterThickPoints() { readRect(rect) } } for rect := range w.currentStroke.IterThickPoints() { setRect(rect, swatch) } } else { for pt := range w.currentStroke.IterPoints() { // note: set already records the original pixel if changing it. set(pt, swatch) } } // Add the stroke to level history. if w.level != nil && addHistory { w.level.UndoHistory.AddStroke(w.currentStroke) } w.RemoveStroke(w.currentStroke) w.currentStroke = nil w.lastPixel = nil } // loopEditable handles the Loop() part for editable canvases. func (w *Canvas) loopEditable(ev *event.State) error { // Get the absolute position of the canvas on screen to accurately match // it up to mouse clicks. var ( P = ui.AbsolutePosition(w) cursor = render.Point{ X: ev.CursorX - P.X - w.Scroll.X, Y: ev.CursorY - P.Y - w.Scroll.Y, } ) // If the actual cursor is not over the actual Canvas UI element, don't // pay any attention to clicks. I added this when I saw you were able to // accidentally draw (with large brush size) when clicking on the Palette // panel and not the drawing itself. if !w.IsCursorOver() { return nil } switch w.Tool { case drawtool.PencilTool: // If no swatch is active, do nothing with mouse clicks. if w.Palette.ActiveSwatch == nil { return nil } // Clicking? Log all the pixels while doing so. if ev.Button1 { // Initialize a new Stroke for this atomic drawing operation? if w.currentStroke == nil { w.currentStroke = drawtool.NewStroke(drawtool.Freehand, w.Palette.ActiveSwatch.Color) w.currentStroke.Thickness = w.BrushSize w.currentStroke.ExtraData = w.Palette.ActiveSwatch w.AddStroke(w.currentStroke) } lastPixel := w.lastPixel pixel := &level.Pixel{ X: cursor.X, Y: cursor.Y, Swatch: w.Palette.ActiveSwatch, } // If the user is holding the mouse down over one spot and not // moving, don't do anything. The pixel has already been set and // needless writes to the map cause needless cache rewrites etc. if lastPixel != nil { if pixel.X == lastPixel.X && pixel.Y == lastPixel.Y { break } } // Append unique new pixels. if lastPixel != nil || lastPixel != pixel { // Draw the pixels in between. if lastPixel != nil && lastPixel != pixel { for point := range render.IterLine(lastPixel.Point(), pixel.Point()) { w.currentStroke.AddPoint(point) } } w.lastPixel = pixel // Save the pixel in the current stroke. w.currentStroke.AddPoint(render.Point{ X: cursor.X, Y: cursor.Y, }) } } else { w.commitStroke(w.Tool, true) } case drawtool.LineTool: // If no swatch is active, do nothing with mouse clicks. if w.Palette.ActiveSwatch == nil { return nil } // Clicking? Log all the pixels while doing so. if ev.Button1 { // Initialize a new Stroke for this atomic drawing operation? if w.currentStroke == nil { w.currentStroke = drawtool.NewStroke(drawtool.Line, w.Palette.ActiveSwatch.Color) w.currentStroke.Thickness = w.BrushSize w.currentStroke.ExtraData = w.Palette.ActiveSwatch w.currentStroke.PointA = render.NewPoint(cursor.X, cursor.Y) w.AddStroke(w.currentStroke) } w.currentStroke.PointB = render.NewPoint(cursor.X, cursor.Y) } else { w.commitStroke(w.Tool, true) } case drawtool.RectTool: // If no swatch is active, do nothing with mouse clicks. if w.Palette.ActiveSwatch == nil { return nil } // Clicking? Log all the pixels while doing so. if ev.Button1 { // Initialize a new Stroke for this atomic drawing operation? if w.currentStroke == nil { w.currentStroke = drawtool.NewStroke(drawtool.Rectangle, w.Palette.ActiveSwatch.Color) w.currentStroke.Thickness = w.BrushSize w.currentStroke.ExtraData = w.Palette.ActiveSwatch w.currentStroke.PointA = render.NewPoint(cursor.X, cursor.Y) w.AddStroke(w.currentStroke) } w.currentStroke.PointB = render.NewPoint(cursor.X, cursor.Y) } else { w.commitStroke(w.Tool, true) } case drawtool.EllipseTool: if w.Palette.ActiveSwatch == nil { return nil } if ev.Button1 { if w.currentStroke == nil { w.currentStroke = drawtool.NewStroke(drawtool.Ellipse, w.Palette.ActiveSwatch.Color) w.currentStroke.Thickness = w.BrushSize w.currentStroke.ExtraData = w.Palette.ActiveSwatch w.currentStroke.PointA = render.NewPoint(cursor.X, cursor.Y) w.AddStroke(w.currentStroke) } w.currentStroke.PointB = render.NewPoint(cursor.X, cursor.Y) } else { w.commitStroke(w.Tool, true) } case drawtool.EraserTool: // Clicking? Log all the pixels while doing so. if ev.Button1 { // Initialize a new Stroke for this atomic drawing operation? if w.currentStroke == nil { // The color is white, will look like white-out that covers the // wallpaper during the stroke. w.currentStroke = drawtool.NewStroke(drawtool.Eraser, render.White) w.currentStroke.Thickness = w.BrushSize w.AddStroke(w.currentStroke) } lastPixel := w.lastPixel pixel := &level.Pixel{ X: cursor.X, Y: cursor.Y, Swatch: w.Palette.ActiveSwatch, } // If the user is holding the mouse down over one spot and not // moving, don't do anything. The pixel has already been set and // needless writes to the map cause needless cache rewrites etc. if lastPixel != nil { if pixel.X == lastPixel.X && pixel.Y == lastPixel.Y { break } } // Append unique new pixels. if lastPixel == nil || lastPixel != pixel { if lastPixel != nil && lastPixel != pixel { for point := range render.IterLine(lastPixel.Point(), pixel.Point()) { w.currentStroke.AddPoint(point) } } w.lastPixel = pixel w.currentStroke.AddPoint(render.Point{ X: cursor.X, Y: cursor.Y, }) } } else { w.commitStroke(w.Tool, true) } case drawtool.ActorTool: // See if any of the actors are below the mouse cursor. var WP = w.WorldIndexAt(cursor) var deleteActors = []*level.Actor{} for _, actor := range w.actors { box := render.Rect{ X: actor.Actor.Point.X - P.X - w.Scroll.X, Y: actor.Actor.Point.Y - P.Y - w.Scroll.Y, W: actor.Canvas.Size().W, H: actor.Canvas.Size().H, } if WP.Inside(box) { actor.Canvas.Configure(ui.Config{ BorderSize: 1, BorderColor: render.RGBA(255, 153, 0, 255), BorderStyle: ui.BorderSolid, Background: render.White, // TODO: cuz the border draws a bgcolor }) // Check for a mouse down event to begin dragging this // canvas around. if ev.Button1 { // Pop this canvas out for the drag/drop. if w.OnDragStart != nil { deleteActors = append(deleteActors, actor.Actor) w.OnDragStart(actor.Actor) } break } else if ev.Button3 { // Right click to delete an actor. deleteActors = append(deleteActors, actor.Actor) } } else { actor.Canvas.SetBorderSize(0) actor.Canvas.SetBackground(render.RGBA(0, 0, 1, 0)) // TODO } } // Change in actor count? if len(deleteActors) > 0 && w.OnDeleteActors != nil { w.OnDeleteActors(deleteActors) } case drawtool.LinkTool: // See if any of the actors are below the mouse cursor. var WP = w.WorldIndexAt(cursor) for _, actor := range w.actors { // Permanently color the actor if it's the current subject of the // Link Tool (after 1st click, until 2nd click of other actor) if w.linkFirst == actor { actor.Canvas.Configure(ui.Config{ Background: render.RGBA(255, 153, 255, 153), }) continue } box := render.Rect{ X: actor.Actor.Point.X - P.X - w.Scroll.X, Y: actor.Actor.Point.Y - P.Y - w.Scroll.Y, W: actor.Canvas.Size().W, H: actor.Canvas.Size().H, } if WP.Inside(box) { actor.Canvas.Configure(ui.Config{ BorderSize: 1, BorderColor: render.RGBA(255, 153, 255, 255), BorderStyle: ui.BorderSolid, Background: render.White, // TODO: cuz the border draws a bgcolor }) // Click handler to start linking this actor. if ev.Button1 { if err := w.LinkAdd(actor); err != nil { return err } // TODO: reset the Button1 state so we don't finish a // link and then LinkAdd the clicked doodad immediately // (causing link chaining) ev.Button1 = false break } } else { actor.Canvas.SetBorderSize(0) actor.Canvas.SetBackground(render.RGBA(0, 0, 1, 0)) // TODO } } } return nil }