78 lines
1.7 KiB
Go
78 lines
1.7 KiB
Go
package uix
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import (
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"git.kirsle.net/SketchyMaze/doodle/pkg/cursor"
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"git.kirsle.net/SketchyMaze/doodle/pkg/drawtool"
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"git.kirsle.net/SketchyMaze/doodle/pkg/shmem"
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"git.kirsle.net/go/render"
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"git.kirsle.net/go/ui"
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)
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// IsCursorOver returns true if the mouse cursor is physically over top
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// of the canvas's widget space.
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func (w *Canvas) IsCursorOver() bool {
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var (
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P = ui.AbsolutePosition(w)
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S = w.Size()
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)
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return shmem.Cursor.Inside(render.Rect{
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X: P.X,
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Y: P.Y,
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W: S.W,
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H: S.H,
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})
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}
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// presentCursor draws something at the mouse cursor on the Canvas.
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//
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// This is currently used in Edit Mode when you're drawing a shape with a thick
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// brush size, and draws a "preview rect" under the cursor of how big a click
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// will be at that size.
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func (w *Canvas) presentCursor(e render.Engine) {
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// Are we to show a custom mouse cursor?
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if w.FancyCursors {
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switch w.Tool {
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case drawtool.PencilTool:
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w.cursor = cursor.NewPencil(e)
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case drawtool.FloodTool:
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w.cursor = cursor.NewFlood(e)
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default:
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w.cursor = nil
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}
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if w.IsCursorOver() && w.cursor != nil {
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cursor.Current = w.cursor
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} else {
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cursor.Current = cursor.NewPointer(e)
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}
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}
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if !w.IsCursorOver() {
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return
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}
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// Are we editing with a thick brush?
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if w.Tool == drawtool.LineTool || w.Tool == drawtool.RectTool ||
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w.Tool == drawtool.PencilTool || w.Tool == drawtool.EllipseTool ||
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w.Tool == drawtool.EraserTool && w.Editable {
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// Draw a box where the brush size is.
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if w.BrushSize > 0 {
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var r = w.BrushSize
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rect := render.Rect{
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X: shmem.Cursor.X - r,
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Y: shmem.Cursor.Y - r,
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W: r * 2,
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H: r * 2,
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}
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e.DrawRect(render.Black, rect)
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rect.X++
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rect.Y++
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rect.W -= 2
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rect.H -= 2
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e.DrawRect(render.RGBA(153, 153, 153, 153), rect)
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}
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}
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}
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