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a36207574a
* java/org/gnu/emacs/EmacsDrawLine.java (perform): Symmetrically adjust coordinates to cover the last pixel. Then, fill the left most pixel of the line.
79 lines
2.1 KiB
Java
79 lines
2.1 KiB
Java
/* Communication module for Android terminals. -*- c-file-style: "GNU" -*-
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
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package org.gnu.emacs;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.Rect;
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public final class EmacsDrawLine
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{
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public static void
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perform (EmacsDrawable drawable, EmacsGC gc,
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int x, int y, int x2, int y2)
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{
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Rect rect;
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Canvas canvas;
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Paint paint;
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int x0, x1, y0, y1;
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/* TODO implement stippling. */
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if (gc.fill_style == EmacsGC.GC_FILL_OPAQUE_STIPPLED)
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return;
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/* Calculate the leftmost and rightmost points. */
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x0 = Math.min (x, x2 + 1);
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x1 = Math.max (x, x2 + 1);
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y0 = Math.min (y, y2 + 1);
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y1 = Math.max (y, y2 + 1);
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/* And the clip rectangle. */
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paint = gc.gcPaint;
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rect = new Rect (x0, y0, x1, y1);
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canvas = drawable.lockCanvas (gc);
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if (canvas == null)
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return;
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paint.setStyle (Paint.Style.FILL);
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/* Since drawLine has PostScript style behavior, adjust the
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coordinates appropriately.
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The left most pixel of a straight line is always partially
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filled. Patch it in manually. */
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if (gc.clip_mask == null)
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{
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canvas.drawLine ((float) x + 0.5f, (float) y + 0.5f,
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(float) x2 + 0.5f, (float) y2 + 0.5f,
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paint);
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if (x2 > x)
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canvas.drawRect (new Rect (x, y, x + 1, y + 1), paint);
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}
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/* DrawLine with clip mask not implemented; it is not used by
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Emacs. */
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drawable.damageRect (rect);
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}
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}
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