vtm/src/org/oscim/renderer/layer/LineLayer.java

537 lines
12 KiB
Java

/*
* Copyright 2012 Hannes Janetzek
*
* This program is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General License for more details.
*
* You should have received a copy of the GNU Lesser General License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.oscim.renderer.layer;
import org.oscim.core.Tile;
import org.oscim.renderer.GLRenderer;
import org.oscim.theme.renderinstruction.Line;
import android.graphics.Paint.Cap;
public final class LineLayer extends Layer {
private static final float COORD_SCALE = GLRenderer.COORD_MULTIPLIER;
// scale factor mapping extrusion vector to short values
private static final float DIR_SCALE = 2048;
// mask for packing last two bits of extrusion vector with texture
// coordinates
private static final int DIR_MASK = 0xFFFFFFFC;
// lines referenced by this outline layer
public LineLayer outlines;
public Line line;
public float width;
LineLayer(int layer) {
this.layer = layer;
this.type = Layer.LINE;
}
public void addOutline(LineLayer link) {
for (LineLayer l = outlines; l != null; l = l.outlines)
if (link == l)
return;
link.outlines = outlines;
outlines = link;
}
/**
* line extrusion is based on code from GLMap
* (https://github.com/olofsj/GLMap/) by olofsj
* @param points
* array of points as float x_n = i, y_n = i+1
* @param index
* array of line indices holding the length of the individual
* lines
* @param closed
* whether to connect start- and end-point
*/
public void addLine(float[] points, short[] index, boolean closed) {
float x, y, nextX, nextY, prevX, prevY;
float a, ux, uy, vx, vy, wx, wy;
int tmax = Tile.TILE_SIZE + 10;
int tmin = -10;
boolean rounded = false;
boolean squared = false;
if (line.cap == Cap.ROUND)
rounded = true;
else if (line.cap == Cap.SQUARE)
squared = true;
if (pool == null) {
pool = curItem = VertexPool.get();
}
VertexPoolItem si = curItem;
short v[] = si.vertices;
int opos = si.used;
for (int i = 0, pos = 0, n = index.length; i < n; i++) {
int length = index[i];
// check end-marker in indices
if (length < 0)
break;
// Note: just a hack to save some vertices
if (rounded && i > 200)
rounded = false;
// need at least two points
if (length < 4) {
pos += length;
continue;
}
// FIXME: remove this when switching to oscimap MapDatabase
closed = false;
// amount of vertices used
// + 2 for drawing triangle-strip
// + 4 for round caps
// + 2 for closing polygons
verticesCnt += length + (rounded ? 6 : 2) + (closed ? 2 : 0);
int ipos = pos;
x = points[ipos++];
y = points[ipos++];
nextX = points[ipos++];
nextY = points[ipos++];
// Calculate triangle corners for the given width
vx = nextX - x;
vy = nextY - y;
a = (float) Math.sqrt(vx * vx + vy * vy);
vx = (vx / a);
vy = (vy / a);
ux = -vy;
uy = vx;
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
short ox, oy, dx, dy;
int ddx, ddy;
ox = (short) (x * COORD_SCALE);
oy = (short) (y * COORD_SCALE);
boolean outside = (x < tmin || x > tmax || y < tmin || y > tmax);
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
if (rounded && !outside) {
// add first vertex twice
ddx = (int) ((ux - vx) * DIR_SCALE);
ddy = (int) ((uy - vy) * DIR_SCALE);
// last two bit encode texture coord (-1)
dx = (short) (0 | ddx & DIR_MASK);
dy = (short) (2 | ddy & DIR_MASK);
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = dx;
v[opos++] = dy;
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = dx;
v[opos++] = dy;
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
ddx = (int) (-(ux + vx) * DIR_SCALE);
ddy = (int) (-(uy + vy) * DIR_SCALE);
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = (short) (2 | ddx & DIR_MASK);
v[opos++] = (short) (2 | ddy & DIR_MASK);
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
// Start of line
ddx = (int) (ux * DIR_SCALE);
ddy = (int) (uy * DIR_SCALE);
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = (short) (0 | ddx & DIR_MASK);
v[opos++] = (short) (1 | ddy & DIR_MASK);
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = (short) (2 | -ddx & DIR_MASK);
v[opos++] = (short) (1 | -ddy & DIR_MASK);
} else {
// outside means line is probably clipped
// TODO should align ending with tile boundary
// for now, just extend the line a little
if (squared) {
vx = 0;
vy = 0;
} else if (!outside) {
vx *= 0.5;
vy *= 0.5;
}
if (rounded)
verticesCnt -= 2;
// add first vertex twice
ddx = (int) ((ux - vx) * DIR_SCALE);
ddy = (int) ((uy - vy) * DIR_SCALE);
dx = (short) (0 | ddx & DIR_MASK);
dy = (short) (1 | ddy & DIR_MASK);
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = dx;
v[opos++] = dy;
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = dx;
v[opos++] = dy;
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
ddx = (int) (-(ux + vx) * DIR_SCALE);
ddy = (int) (-(uy + vy) * DIR_SCALE);
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = (short) (2 | ddx & DIR_MASK);
v[opos++] = (short) (1 | ddy & DIR_MASK);
}
prevX = x;
prevY = y;
x = nextX;
y = nextY;
boolean flip = false;
for (;;) {
if (ipos < pos + length) {
nextX = points[ipos++];
nextY = points[ipos++];
} else if (closed && ipos < pos + length + 2) {
// add startpoint == endpoint
nextX = points[pos];
nextY = points[pos + 1];
ipos += 2;
} else
break;
// Unit vector pointing back to previous node
vx = prevX - x;
vy = prevY - y;
a = (float) Math.sqrt(vx * vx + vy * vy);
vx = (vx / a);
vy = (vy / a);
// Unit vector pointing forward to next node
wx = nextX - x;
wy = nextY - y;
a = (float) Math.sqrt(wx * wx + wy * wy);
wx = (wx / a);
wy = (wy / a);
// Sum of these two vectors points
ux = vx + wx;
uy = vy + wy;
a = -wy * ux + wx * uy;
// boolean split = false;
if (a < 0.01f && a > -0.01f) {
// Almost straight
ux = -wy;
uy = wx;
} else {
ux = (ux / a);
uy = (uy / a);
// avoid miter going to infinity.
// TODO add option for round joints
if (ux > 4.0f || ux < -4.0f || uy > 4.0f || uy < -4.0f) {
ux = vx - wx;
uy = vy - wy;
a = -wy * ux + wx * uy;
ux = (ux / a);
uy = (uy / a);
flip = !flip;
}
}
ox = (short) (x * COORD_SCALE);
oy = (short) (y * COORD_SCALE);
ddx = (int) (ux * DIR_SCALE);
ddy = (int) (uy * DIR_SCALE);
if (flip) {
ddx *= -1;
ddy *= -1;
}
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = (short) (0 | ddx & DIR_MASK);
v[opos++] = (short) (1 | ddy & DIR_MASK);
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = (short) (2 | -ddx & DIR_MASK);
v[opos++] = (short) (1 | -ddy & DIR_MASK);
prevX = x;
prevY = y;
x = nextX;
y = nextY;
}
vx = prevX - x;
vy = prevY - y;
a = (float) Math.sqrt(vx * vx + vy * vy);
vx = (vx / a);
vy = (vy / a);
ux = vy;
uy = -vx;
outside = (x < tmin || x > tmax || y < tmin || y > tmax);
if (opos == VertexPoolItem.SIZE) {
si.next = VertexPool.get();
si = si.next;
opos = 0;
v = si.vertices;
}
ox = (short) (x * COORD_SCALE);
oy = (short) (y * COORD_SCALE);
if (rounded && !outside) {
ddx = (int) (ux * DIR_SCALE);
ddy = (int) (uy * DIR_SCALE);
if (flip) {
ddx *= -1;
ddy *= -1;
}
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = (short) (0 | ddx & DIR_MASK);
v[opos++] = (short) (1 | ddy & DIR_MASK);
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = (short) (2 | -ddx & DIR_MASK);
v[opos++] = (short) (1 | -ddy & DIR_MASK);
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
// For rounded line edges
ddx = (int) ((ux - vx) * DIR_SCALE);
ddy = (int) ((uy - vy) * DIR_SCALE);
dx = (short) (0 | ddx & DIR_MASK);
dy = (short) (0 | ddy & DIR_MASK);
if (flip) {
ddx *= -1;
ddy *= -1;
}
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = dx;
v[opos++] = dy;
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
// add last vertex twice
ddx = (int) (-(ux + vx) * DIR_SCALE);
ddy = (int) (-(uy + vy) * DIR_SCALE);
dx = (short) (2 | ddx & DIR_MASK);
dy = (short) (0 | ddy & DIR_MASK);
if (flip) {
ddx *= -1;
ddy *= -1;
}
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = dx;
v[opos++] = dy;
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = dx;
v[opos++] = dy;
} else {
if (squared) {
vx = 0;
vy = 0;
} else if (!outside) {
vx *= 0.5;
vy *= 0.5;
}
if (rounded)
verticesCnt -= 2;
ddx = (int) ((ux - vx) * DIR_SCALE);
ddy = (int) ((uy - vy) * DIR_SCALE);
if (flip) {
ddx *= -1;
ddy *= -1;
}
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = (short) (0 | ddx & DIR_MASK);
v[opos++] = (short) (1 | ddy & DIR_MASK);
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
// add last vertex twice
ddx = (int) (-(ux + vx) * DIR_SCALE);
ddy = (int) (-(uy + vy) * DIR_SCALE);
if (flip) {
ddx *= -1;
ddy *= -1;
}
dx = (short) (2 | ddx & DIR_MASK);
dy = (short) (1 | ddy & DIR_MASK);
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = dx;
v[opos++] = dy;
if (opos == VertexPoolItem.SIZE) {
si = si.next = VertexPool.get();
v = si.vertices;
opos = 0;
}
v[opos++] = ox;
v[opos++] = oy;
v[opos++] = dx;
v[opos++] = dy;
}
pos += length;
}
si.used = opos;
curItem = si;
}
@Override
protected void clear() {
}
}