doodle/pkg/uix/canvas_editable.go
Noah Petherbridge fd730483b0 Zoom Improvements
* Doodad outline while dragging is now sized properly for the zoom level
* Make doodad hitboxes for Actor/Link Tool more accurate while zoomed
* Fix chunks low on the level not loading while zoomed in
* Fix Link lines drawn between doodads while zoomed - they point to the
  correct position and their DrawLine calls have been optimized so they
  don't lag out the level when lots of them are drawn at once.
2021-09-12 15:27:37 -07:00

417 lines
12 KiB
Go

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).
// Note: all the points on the stroke were mouse cursor coordinates on the screen.
w.currentStroke = w.ZoomStroke(w.currentStroke)
// 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.Pattern = w.Palette.ActiveSwatch.Pattern
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.Pattern = w.Palette.ActiveSwatch.Pattern
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.Pattern = w.Palette.ActiveSwatch.Pattern
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.Pattern = w.Palette.ActiveSwatch.Pattern
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)
// log.Debug("ActorTool, cursor=%s WP=%s zoom=%d P=%s", cursor, WP, w.Zoom, ui.AbsolutePosition(w))
var deleteActors = []*level.Actor{}
for _, actor := range w.actors {
// Compute the bounding box on screen where this doodad
// visually appears.
var scrollBias = render.Point{
X: w.Scroll.X,
Y: w.Scroll.Y,
}
if w.Zoom != 0 {
scrollBias.X = w.ZoomDivide(scrollBias.X)
scrollBias.Y = w.ZoomDivide(scrollBias.Y)
}
box := render.Rect{
X: actor.Actor.Point.X - scrollBias.X - w.ZoomDivide(P.X),
Y: actor.Actor.Point.Y - scrollBias.Y - w.ZoomDivide(P.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
}
// Compute the bounding box on screen where this doodad
// visually appears.
var scrollBias = render.Point{
X: w.Scroll.X,
Y: w.Scroll.Y,
}
if w.Zoom != 0 {
scrollBias.X = w.ZoomDivide(scrollBias.X)
scrollBias.Y = w.ZoomDivide(scrollBias.Y)
}
box := render.Rect{
X: actor.Actor.Point.X - scrollBias.X - w.ZoomDivide(P.X),
Y: actor.Actor.Point.Y - scrollBias.Y - w.ZoomDivide(P.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
}