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Consolidate data and algorithm of calculating rounded line (Step 1) 

Change-Id: Ic6d72b5a34ddfbc55317fa651f78af6f50c9a284
main
Tadashi G. Takaoka 2012-11-29 14:08:47 +09:00
parent 9b935084ea
commit 0d034b3169
1 changed files with 60 additions and 60 deletions
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120
java/src/com/android/inputmethod/keyboard/internal/GesturePreviewTrail.java
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@ -144,68 +144,68 @@ final class GesturePreviewTrail {
// Sweep angle of the trail arc at P2.
public float a2;
public RectF arc2 = new RectF();
}
private static final float RIGHT_ANGLE = (float)(Math.PI / 2.0d);
private static final float RADIAN_TO_DEGREE = (float)(180.0d / Math.PI);
private static final float RADIAN_TO_DEGREE = (float)(180.0d / Math.PI);
private static final float RIGHT_ANGLE = (float)(Math.PI / 2.0d);
private static boolean calculatePathPoints(final WorkingSet w) {
final float dx = w.p2x - w.p1x;
final float dy = w.p2y - w.p1y;
// Distance of the points.
final double l = Math.hypot(dx, dy);
if (Double.compare(0.0d, l) == 0) {
return false;
public static boolean calculatePathPoints(final WorkingSet w) {
final float dx = w.p2x - w.p1x;
final float dy = w.p2y - w.p1y;
// Distance of the points.
final double l = Math.hypot(dx, dy);
if (Double.compare(0.0d, l) == 0) {
return false;
}
// Angle of the line p1-p2
final float a = (float)Math.atan2(dy, dx);
// Difference of trail cap radius.
final float dr = w.r2 - w.r1;
// Variation of angle at trail cap.
final float ar = (float)Math.asin(dr / l);
// The start angle of trail cap arc at P1.
final float aa = a - (RIGHT_ANGLE + ar);
// The end angle of trail cap arc at P2.
final float ab = a + (RIGHT_ANGLE + ar);
final float cosa = (float)Math.cos(aa);
final float sina = (float)Math.sin(aa);
final float cosb = (float)Math.cos(ab);
final float sinb = (float)Math.sin(ab);
w.p1ax = w.p1x + w.r1 * cosa;
w.p1ay = w.p1y + w.r1 * sina;
w.p1bx = w.p1x + w.r1 * cosb;
w.p1by = w.p1y + w.r1 * sinb;
w.p2ax = w.p2x + w.r2 * cosa;
w.p2ay = w.p2y + w.r2 * sina;
w.p2bx = w.p2x + w.r2 * cosb;
w.p2by = w.p2y + w.r2 * sinb;
w.aa = aa * RADIAN_TO_DEGREE;
final float ar2degree = ar * 2.0f * RADIAN_TO_DEGREE;
w.a1 = -180.0f + ar2degree;
w.a2 = 180.0f + ar2degree;
w.arc1.set(w.p1x, w.p1y, w.p1x, w.p1y);
w.arc1.inset(-w.r1, -w.r1);
w.arc2.set(w.p2x, w.p2y, w.p2x, w.p2y);
w.arc2.inset(-w.r2, -w.r2);
return true;
}
// Angle of the line p1-p2
final float a = (float)Math.atan2(dy, dx);
// Difference of trail cap radius.
final float dr = w.r2 - w.r1;
// Variation of angle at trail cap.
final float ar = (float)Math.asin(dr / l);
// The start angle of trail cap arc at P1.
final float aa = a - (RIGHT_ANGLE + ar);
// The end angle of trail cap arc at P2.
final float ab = a + (RIGHT_ANGLE + ar);
final float cosa = (float)Math.cos(aa);
final float sina = (float)Math.sin(aa);
final float cosb = (float)Math.cos(ab);
final float sinb = (float)Math.sin(ab);
w.p1ax = w.p1x + w.r1 * cosa;
w.p1ay = w.p1y + w.r1 * sina;
w.p1bx = w.p1x + w.r1 * cosb;
w.p1by = w.p1y + w.r1 * sinb;
w.p2ax = w.p2x + w.r2 * cosa;
w.p2ay = w.p2y + w.r2 * sina;
w.p2bx = w.p2x + w.r2 * cosb;
w.p2by = w.p2y + w.r2 * sinb;
w.aa = aa * RADIAN_TO_DEGREE;
final float ar2degree = ar * 2.0f * RADIAN_TO_DEGREE;
w.a1 = -180.0f + ar2degree;
w.a2 = 180.0f + ar2degree;
w.arc1.set(w.p1x, w.p1y, w.p1x, w.p1y);
w.arc1.inset(-w.r1, -w.r1);
w.arc2.set(w.p2x, w.p2y, w.p2x, w.p2y);
w.arc2.inset(-w.r2, -w.r2);
return true;
}
private static void createPath(final Path path, final WorkingSet w) {
path.rewind();
// Trail cap at P1.
path.moveTo(w.p1x, w.p1y);
path.arcTo(w.arc1, w.aa, w.a1);
// Trail cap at P2.
path.moveTo(w.p2x, w.p2y);
path.arcTo(w.arc2, w.aa, w.a2);
// Two trapezoids connecting P1 and P2.
path.moveTo(w.p1ax, w.p1ay);
path.lineTo(w.p1x, w.p1y);
path.lineTo(w.p1bx, w.p1by);
path.lineTo(w.p2bx, w.p2by);
path.lineTo(w.p2x, w.p2y);
path.lineTo(w.p2ax, w.p2ay);
path.close();
public static void createPath(final Path path, final WorkingSet w) {
path.rewind();
// Trail cap at P1.
path.moveTo(w.p1x, w.p1y);
path.arcTo(w.arc1, w.aa, w.a1);
// Trail cap at P2.
path.moveTo(w.p2x, w.p2y);
path.arcTo(w.arc2, w.aa, w.a2);
// Two trapezoids connecting P1 and P2.
path.moveTo(w.p1ax, w.p1ay);
path.lineTo(w.p1x, w.p1y);
path.lineTo(w.p1bx, w.p1by);
path.lineTo(w.p2bx, w.p2by);
path.lineTo(w.p2x, w.p2y);
path.lineTo(w.p2ax, w.p2ay);
path.close();
}
}
private final WorkingSet mWorkingSet = new WorkingSet();
@ -262,8 +262,8 @@ final class GesturePreviewTrail {
paint.setAlpha(alpha);
final float width = getWidth(elapsedTime, params);
w.r2 = width / 2.0f;
if (calculatePathPoints(w)) {
createPath(path, w);
if (WorkingSet.calculatePathPoints(w)) {
WorkingSet.createPath(path, w);
canvas.drawPath(path, paint);
outBoundsRect.union((int)w.p2x, (int)w.p2y);
}