366 lines
10 KiB
Go
366 lines
10 KiB
Go
package uix
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import (
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"git.kirsle.net/apps/doodle/lib/events"
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"git.kirsle.net/apps/doodle/lib/render"
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"git.kirsle.net/apps/doodle/lib/ui"
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"git.kirsle.net/apps/doodle/pkg/drawtool"
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"git.kirsle.net/apps/doodle/pkg/level"
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)
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// commitStroke is the common function that applies a stroke the user is
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// actively drawing onto the canvas. This is for Edit Mode.
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func (w *Canvas) commitStroke(tool drawtool.Tool, addHistory bool) {
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if w.currentStroke == nil {
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// nothing to commit
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return
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}
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var (
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deleting = w.currentStroke.Shape == drawtool.Eraser
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dedupe = map[render.Point]interface{}{} // don't revisit the same point twice
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// Helper functions to set pixels on the level while storing the original
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// value of any pixel being replaced.
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set = func(pt render.Point, sw *level.Swatch) {
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// Take note of what pixel was originally here before we change it.
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if swatch, err := w.chunks.Get(pt); err == nil {
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if _, ok := dedupe[pt]; !ok {
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w.currentStroke.OriginalPoints[pt] = swatch
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dedupe[pt] = nil
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}
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}
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if deleting {
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w.chunks.Delete(pt)
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} else if sw != nil {
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w.chunks.Set(pt, sw)
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} else {
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panic("Canvas.commitStroke.set: current stroke has no level.Swatch in ExtraData")
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}
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}
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// Rects: read existing pixels first, then write new pixels
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readRect = func(rect render.Rect) {
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for pt := range w.chunks.IterViewport(rect) {
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point := pt.Point()
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if _, ok := dedupe[point]; !ok {
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w.currentStroke.OriginalPoints[pt.Point()] = pt.Swatch
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dedupe[point] = nil
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}
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}
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}
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setRect = func(rect render.Rect, sw *level.Swatch) {
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if deleting {
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w.chunks.DeleteRect(rect)
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} else if sw != nil {
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w.chunks.SetRect(rect, sw)
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} else {
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panic("Canvas.commitStroke.setRect: current stroke has no level.Swatch in ExtraData")
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}
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}
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)
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var swatch *level.Swatch
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if v, ok := w.currentStroke.ExtraData.(*level.Swatch); ok {
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swatch = v
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}
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if w.currentStroke.Thickness > 0 {
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// Eraser Tool only: record which pixels will be blown away by this.
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// This is SLOW for thick (rect-based) lines, but eraser tool must have it.
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if deleting {
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for rect := range w.currentStroke.IterThickPoints() {
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readRect(rect)
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}
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}
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for rect := range w.currentStroke.IterThickPoints() {
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setRect(rect, swatch)
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}
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} else {
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for pt := range w.currentStroke.IterPoints() {
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// note: set already records the original pixel if changing it.
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set(pt, swatch)
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}
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}
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// Add the stroke to level history.
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if w.level != nil && addHistory {
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w.level.UndoHistory.AddStroke(w.currentStroke)
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}
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w.RemoveStroke(w.currentStroke)
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w.currentStroke = nil
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w.lastPixel = nil
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}
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// loopEditable handles the Loop() part for editable canvases.
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func (w *Canvas) loopEditable(ev *events.State) error {
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// Get the absolute position of the canvas on screen to accurately match
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// it up to mouse clicks.
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var (
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P = ui.AbsolutePosition(w)
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cursor = render.Point{
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X: ev.CursorX.Now - P.X - w.Scroll.X,
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Y: ev.CursorY.Now - P.Y - w.Scroll.Y,
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}
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)
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// If the actual cursor is not over the actual Canvas UI element, don't
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// pay any attention to clicks. I added this when I saw you were able to
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// accidentally draw (with large brush size) when clicking on the Palette
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// panel and not the drawing itself.
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if !w.IsCursorOver() {
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return nil
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}
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switch w.Tool {
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case drawtool.PencilTool:
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// If no swatch is active, do nothing with mouse clicks.
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if w.Palette.ActiveSwatch == nil {
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return nil
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}
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// Clicking? Log all the pixels while doing so.
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if ev.Button1.Now {
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// Initialize a new Stroke for this atomic drawing operation?
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if w.currentStroke == nil {
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w.currentStroke = drawtool.NewStroke(drawtool.Freehand, w.Palette.ActiveSwatch.Color)
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w.currentStroke.Thickness = w.BrushSize
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w.currentStroke.ExtraData = w.Palette.ActiveSwatch
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w.AddStroke(w.currentStroke)
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}
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lastPixel := w.lastPixel
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pixel := &level.Pixel{
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X: cursor.X,
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Y: cursor.Y,
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Swatch: w.Palette.ActiveSwatch,
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}
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// If the user is holding the mouse down over one spot and not
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// moving, don't do anything. The pixel has already been set and
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// needless writes to the map cause needless cache rewrites etc.
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if lastPixel != nil {
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if pixel.X == lastPixel.X && pixel.Y == lastPixel.Y {
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break
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}
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}
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// Append unique new pixels.
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if lastPixel != nil || lastPixel != pixel {
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// Draw the pixels in between.
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if lastPixel != nil && lastPixel != pixel {
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for point := range render.IterLine(lastPixel.Point(), pixel.Point()) {
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w.currentStroke.AddPoint(point)
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}
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}
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w.lastPixel = pixel
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// Save the pixel in the current stroke.
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w.currentStroke.AddPoint(render.Point{
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X: cursor.X,
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Y: cursor.Y,
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})
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}
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} else {
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w.commitStroke(w.Tool, true)
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}
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case drawtool.LineTool:
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// If no swatch is active, do nothing with mouse clicks.
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if w.Palette.ActiveSwatch == nil {
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return nil
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}
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// Clicking? Log all the pixels while doing so.
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if ev.Button1.Now {
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// Initialize a new Stroke for this atomic drawing operation?
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if w.currentStroke == nil {
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w.currentStroke = drawtool.NewStroke(drawtool.Line, w.Palette.ActiveSwatch.Color)
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w.currentStroke.Thickness = w.BrushSize
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w.currentStroke.ExtraData = w.Palette.ActiveSwatch
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w.currentStroke.PointA = render.NewPoint(cursor.X, cursor.Y)
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w.AddStroke(w.currentStroke)
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}
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w.currentStroke.PointB = render.NewPoint(cursor.X, cursor.Y)
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} else {
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w.commitStroke(w.Tool, true)
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}
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case drawtool.RectTool:
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// If no swatch is active, do nothing with mouse clicks.
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if w.Palette.ActiveSwatch == nil {
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return nil
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}
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// Clicking? Log all the pixels while doing so.
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if ev.Button1.Now {
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// Initialize a new Stroke for this atomic drawing operation?
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if w.currentStroke == nil {
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w.currentStroke = drawtool.NewStroke(drawtool.Rectangle, w.Palette.ActiveSwatch.Color)
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w.currentStroke.Thickness = w.BrushSize
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w.currentStroke.ExtraData = w.Palette.ActiveSwatch
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w.currentStroke.PointA = render.NewPoint(cursor.X, cursor.Y)
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w.AddStroke(w.currentStroke)
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}
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w.currentStroke.PointB = render.NewPoint(cursor.X, cursor.Y)
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} else {
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w.commitStroke(w.Tool, true)
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}
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case drawtool.EllipseTool:
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if w.Palette.ActiveSwatch == nil {
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return nil
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}
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if ev.Button1.Now {
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if w.currentStroke == nil {
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w.currentStroke = drawtool.NewStroke(drawtool.Ellipse, w.Palette.ActiveSwatch.Color)
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w.currentStroke.Thickness = w.BrushSize
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w.currentStroke.ExtraData = w.Palette.ActiveSwatch
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w.currentStroke.PointA = render.NewPoint(cursor.X, cursor.Y)
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w.AddStroke(w.currentStroke)
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}
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w.currentStroke.PointB = render.NewPoint(cursor.X, cursor.Y)
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} else {
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w.commitStroke(w.Tool, true)
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}
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case drawtool.EraserTool:
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// Clicking? Log all the pixels while doing so.
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if ev.Button1.Now {
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// Initialize a new Stroke for this atomic drawing operation?
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if w.currentStroke == nil {
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// The color is white, will look like white-out that covers the
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// wallpaper during the stroke.
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w.currentStroke = drawtool.NewStroke(drawtool.Eraser, render.White)
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w.currentStroke.Thickness = w.BrushSize
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w.AddStroke(w.currentStroke)
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}
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lastPixel := w.lastPixel
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pixel := &level.Pixel{
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X: cursor.X,
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Y: cursor.Y,
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Swatch: w.Palette.ActiveSwatch,
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}
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// If the user is holding the mouse down over one spot and not
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// moving, don't do anything. The pixel has already been set and
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// needless writes to the map cause needless cache rewrites etc.
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if lastPixel != nil {
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if pixel.X == lastPixel.X && pixel.Y == lastPixel.Y {
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break
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}
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}
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// Append unique new pixels.
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if lastPixel == nil || lastPixel != pixel {
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if lastPixel != nil && lastPixel != pixel {
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for point := range render.IterLine(lastPixel.Point(), pixel.Point()) {
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w.currentStroke.AddPoint(point)
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}
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}
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w.lastPixel = pixel
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w.currentStroke.AddPoint(render.Point{
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X: cursor.X,
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Y: cursor.Y,
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})
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}
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} else {
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w.commitStroke(w.Tool, true)
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}
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case drawtool.ActorTool:
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// See if any of the actors are below the mouse cursor.
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var WP = w.WorldIndexAt(cursor)
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var deleteActors = []*level.Actor{}
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for _, actor := range w.actors {
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box := render.Rect{
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X: actor.Actor.Point.X - P.X - w.Scroll.X,
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Y: actor.Actor.Point.Y - P.Y - w.Scroll.Y,
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W: actor.Canvas.Size().W,
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H: actor.Canvas.Size().H,
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}
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if WP.Inside(box) {
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actor.Canvas.Configure(ui.Config{
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BorderSize: 1,
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BorderColor: render.RGBA(255, 153, 0, 255),
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BorderStyle: ui.BorderSolid,
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Background: render.White, // TODO: cuz the border draws a bgcolor
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})
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// Check for a mouse down event to begin dragging this
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// canvas around.
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if ev.Button1.Read() {
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// Pop this canvas out for the drag/drop.
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if w.OnDragStart != nil {
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deleteActors = append(deleteActors, actor.Actor)
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w.OnDragStart(actor.Actor)
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}
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break
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} else if ev.Button2.Read() {
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// Right click to delete an actor.
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deleteActors = append(deleteActors, actor.Actor)
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}
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} else {
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actor.Canvas.SetBorderSize(0)
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actor.Canvas.SetBackground(render.RGBA(0, 0, 1, 0)) // TODO
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}
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}
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// Change in actor count?
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if len(deleteActors) > 0 && w.OnDeleteActors != nil {
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w.OnDeleteActors(deleteActors)
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}
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case drawtool.LinkTool:
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// See if any of the actors are below the mouse cursor.
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var WP = w.WorldIndexAt(cursor)
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for _, actor := range w.actors {
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// Permanently color the actor if it's the current subject of the
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// Link Tool (after 1st click, until 2nd click of other actor)
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if w.linkFirst == actor {
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actor.Canvas.Configure(ui.Config{
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Background: render.RGBA(255, 153, 255, 153),
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})
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continue
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}
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box := render.Rect{
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X: actor.Actor.Point.X - P.X - w.Scroll.X,
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Y: actor.Actor.Point.Y - P.Y - w.Scroll.Y,
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W: actor.Canvas.Size().W,
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H: actor.Canvas.Size().H,
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}
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if WP.Inside(box) {
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actor.Canvas.Configure(ui.Config{
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BorderSize: 1,
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BorderColor: render.RGBA(255, 153, 255, 255),
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BorderStyle: ui.BorderSolid,
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Background: render.White, // TODO: cuz the border draws a bgcolor
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})
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// Click handler to start linking this actor.
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if ev.Button1.Read() {
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if err := w.LinkAdd(actor); err != nil {
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return err
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}
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break
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}
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} else {
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actor.Canvas.SetBorderSize(0)
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actor.Canvas.SetBackground(render.RGBA(0, 0, 1, 0)) // TODO
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}
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}
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}
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return nil
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}
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