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Make rounde line algorithm as instance method (Step 2)

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Change-Id: Ia6f41dc0ce7d3f3a1e4a8bbe838835cbdd94e6e9
This commit is contained in:
Tadashi G. Takaoka 2012-11-29 14:22:18 +09:00
parent 0d034b3169
commit 8cfd64eed9
1 changed files with 41 additions and 42 deletions
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83
java/src/com/android/inputmethod/keyboard/internal/GesturePreviewTrail.java
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@ -127,30 +127,29 @@ final class GesturePreviewTrail {
public float p2x, p2y;
public float r2;
// Output
// Closing point of arc at P1.
public float p1ax, p1ay;
private float p1ax, p1ay;
// Opening point of arc at P1.
public float p1bx, p1by;
private float p1bx, p1by;
// Opening point of arc at P2.
public float p2ax, p2ay;
private float p2ax, p2ay;
// Closing point of arc at P2.
public float p2bx, p2by;
private float p2bx, p2by;
// Start angle of the trail arcs.
public float aa;
private float angle;
// Sweep angle of the trail arc at P1.
public float a1;
public RectF arc1 = new RectF();
private float a1;
private final RectF arc1 = new RectF();
// Sweep angle of the trail arc at P2.
public float a2;
public RectF arc2 = new RectF();
private float a2;
private final RectF arc2 = new RectF();
private static final float RADIAN_TO_DEGREE = (float)(180.0d / Math.PI);
private static final float RIGHT_ANGLE = (float)(Math.PI / 2.0d);
public static boolean calculatePathPoints(final WorkingSet w) {
final float dx = w.p2x - w.p1x;
final float dy = w.p2y - w.p1y;
public boolean calculatePathPoints() {
final float dx = p2x - p1x;
final float dy = p2y - p1y;
// Distance of the points.
final double l = Math.hypot(dx, dy);
if (Double.compare(0.0d, l) == 0) {
@ -159,7 +158,7 @@ final class GesturePreviewTrail {
// 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;
final float dr = r2 - r1;
// Variation of angle at trail cap.
final float ar = (float)Math.asin(dr / l);
// The start angle of trail cap arc at P1.
@ -170,40 +169,40 @@ final class GesturePreviewTrail {
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;
p1ax = p1x + r1 * cosa;
p1ay = p1y + r1 * sina;
p1bx = p1x + r1 * cosb;
p1by = p1y + r1 * sinb;
p2ax = p2x + r2 * cosa;
p2ay = p2y + r2 * sina;
p2bx = p2x + r2 * cosb;
p2by = p2y + r2 * sinb;
angle = 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);
a1 = -180.0f + ar2degree;
a2 = 180.0f + ar2degree;
arc1.set(p1x, p1y, p1x, p1y);
arc1.inset(-r1, -r1);
arc2.set(p2x, p2y, p2x, p2y);
arc2.inset(-r2, -r2);
return true;
}
public static void createPath(final Path path, final WorkingSet w) {
public void createPath(final Path path) {
path.rewind();
// Trail cap at P1.
path.moveTo(w.p1x, w.p1y);
path.arcTo(w.arc1, w.aa, w.a1);
path.moveTo(p1x, p1y);
path.arcTo(arc1, angle, a1);
// Trail cap at P2.
path.moveTo(w.p2x, w.p2y);
path.arcTo(w.arc2, w.aa, w.a2);
path.moveTo(p2x, p2y);
path.arcTo(arc2, angle, 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.moveTo(p1ax, p1ay);
path.lineTo(p1x, p1y);
path.lineTo(p1bx, p1by);
path.lineTo(p2bx, p2by);
path.lineTo(p2x, p2y);
path.lineTo(p2ax, p2ay);
path.close();
}
}
@ -262,8 +261,8 @@ final class GesturePreviewTrail {
paint.setAlpha(alpha);
final float width = getWidth(elapsedTime, params);
w.r2 = width / 2.0f;
if (WorkingSet.calculatePathPoints(w)) {
WorkingSet.createPath(path, w);
if (w.calculatePathPoints()) {
w.createPath(path);
canvas.drawPath(path, paint);
outBoundsRect.union((int)w.p2x, (int)w.p2y);
}