package gml4u.brushes;
import java.util.Iterator;
import gml4u.drawing.GmlStrokeDrawer;
import gml4u.model.GmlPoint;
import gml4u.model.GmlStroke;
import processing.core.PConstants;
import processing.core.PGraphics;
import toxi.geom.Vec3D;
import toxi.geom.mesh.Face;
import toxi.geom.mesh.TriangleMesh;
public class MeshDemo extends GmlStrokeDrawer {
public static final String ID = "GML4U_STYLE_MESH0000";
/**
* MeshDemo constructor
*/
public MeshDemo() {
super(ID);
}
public void draw(PGraphics g, GmlStroke stroke, float scale, float minTime, float maxTime) {
TriangleMesh mesh = buildMesh(stroke, minTime, maxTime);
mesh.scale(scale);
g.pushMatrix();
g.pushStyle();
// Style
g.noStroke();
g.beginShape(PConstants.TRIANGLES);
// iterate over all faces/triangles of the mesh
//for(Face f : mesh.faces) {
for(Iterator<?> i=mesh.faces.iterator(); i.hasNext();) {
Face f=(Face)i.next();
if (g.is3D()) {
g.vertex(f.a.x, f.a.y, f.a.z);
g.vertex(f.b.x, f.b.y, f.b.z);
g.vertex(f.c.x, f.c.y, f.c.z);
}
else {
g.vertex(f.a.x, f.a.y);
g.vertex(f.b.x, f.b.y);
g.vertex(f.c.x, f.c.y);
}
}
g.endShape();
g.popStyle();
g.popMatrix();
}
// TODO move that to an Helper
private static TriangleMesh buildMesh(GmlStroke stroke, float minTime, float maxTime) {
TriangleMesh mesh = new TriangleMesh("");
if (stroke.getPoints().size() > 0) {
GmlPoint prev = new GmlPoint();
GmlPoint pos = new GmlPoint();
Vec3D a = new Vec3D();
Vec3D b = new Vec3D();
Vec3D p = new Vec3D();
Vec3D q = new Vec3D();
float weight = 0;
prev.set(stroke.getPoints().get(0));
for (GmlPoint point: stroke.getPoints()) {
if (point.time < minTime) continue;
if (point.time > maxTime) break;
pos.set(point);
// use distance to previous point as target stroke weight
weight += (pos.distanceTo(prev)*4-weight)*0.1;
// define offset points for the triangle strip
a.set(pos);
b.set(pos);
a.addSelf(0, 0, weight);
b.addSelf(0, 0, -weight);
// add 2 faces to the mesh
mesh.addFace(p,b,q);
mesh.addFace(p, b, a);
// store current points for next iteration
prev.set(pos);
p.set(a);
q.set(b);
}
}
mesh.computeVertexNormals();
return mesh;
}
}