// Draw each path onto the passed cairo context
void PathSimplificationApp::drawPath(cairo::Context &ctx, SmoothPath *smoothPath, int mode)
{
// initialize the line settings
float thickness = 1.0;
ctx.setLineWidth( 1.0f );
ctx.setLineCap(cairo::LINE_CAP_ROUND);
ctx.setLineJoin(cairo::LINE_JOIN_ROUND);
if(smoothPath->inProgress){
// draw lines point to point
vector<Vec2f> pathPoints = smoothPath->getPathPoints();
for (int i=1; i<pathPoints.size(); i++) {
drawLine(ctx, pathPoints[i-1], pathPoints[i], 1.0, Color(1.0, 0.0, 0.0));
drawCircle(ctx, pathPoints[i], 2, Color(1.0, 0.0, 0.0));
}
}else{
// draw smooth lines
Path2d path = smoothPath->getCurrentPath();
drawCurves(ctx, path, thickness, Color(255.0, 0.0, 0.0));
int pointIndex = 0;
// draw circles at the bezier points
for (int i=0; i<path.getNumSegments(); i++) {
Vec2f c1 = path.getPoint(pointIndex+1);
Vec2f c2 = path.getPoint(pointIndex+2);
Vec2f pt1 = path.getPoint(pointIndex);
Vec2f pt2 = path.getPoint(pointIndex+3);
drawCircle(ctx, c1, 1, Color(1.0f, 1.0f, 0.0f), true);
drawCircle(ctx, c2, 1, Color(0.0f, 1.0f, 1.0f));
drawLine(ctx, c1, pt1, 1, Color(1.0, 1.0, 0.0 ));
drawLine(ctx, c2, pt2, 1, Color(0.0, 1.0, 1.0 ));
pointIndex += 3;
}
}
}
// Draw each path onto the passed cairo context
void ContinuousPathApp::drawPath(cairo::Context &ctx, SmoothPath *smoothPath, int mode)
{
// update the drawing points only if the line hasn't been completed
Path2d path = smoothPath->getCurrentPath();
vector<Vec2f> pathPoints = smoothPath->getPathPoints();
vector<int> endPoints = smoothPath->getEndPoints();
if(path.getNumPoints() == 0) return;
// initialize the line settings
float thickness = 1.0;
ctx.setLineWidth( 1.0f );
ctx.setLineCap(cairo::LINE_CAP_ROUND);
ctx.setLineJoin(cairo::LINE_JOIN_ROUND);
Vec2f pt = path.getPoint(0);
// draw bezier line
if (mode != 5) {
// draw the line based on bezier points
drawCurves(ctx, path, thickness, Color(255.0, 0.0, 0.0));
}
// draw circles at each of the original path points
if(mode != 1 && mode != 5){
for (int i=0; i<pathPoints.size(); i++) {
Vec2f pt = pathPoints[i];
drawCircle(ctx, pt, 1, Color( 1.0f, 1.0f, 1.0f ));
}
}
int i;
int pointIndex = 0;
// draw circles at the bezier points
for (i=0; i<path.getNumSegments(); i++) {
int segType = path.getSegmentType(i);
// change jumpIndex depending on the type of segment
switch(segType){
case Path2d::CUBICTO:
{
Vec2f c1 = path.getPoint(pointIndex+1);
Vec2f c2 = path.getPoint(pointIndex+2);
Vec2f pt1 = path.getPoint(pointIndex);
Vec2f pt2 = path.getPoint(pointIndex+3);
if (mode == 2 || mode == 3) {
if(mode == 2){
for(int j=0; j<endPoints.size(); j++){
if(endPoints[j] == pointIndex){
drawCircle(ctx, pt2, 8, Color(0.0f, 1.0f, 1.0f), true);
}
}
}
if(mode == 3){
// draw the control points and tangent lines
drawCircle(ctx, c1, 2, Color(1.0f, 1.0f, 0.0f), true);
drawCircle(ctx, c2, 2, Color(0.0f, 1.0f, 1.0f));
drawLine(ctx, c1, pt1, 1, Color(1.0, 1.0, 0.0 ));
drawLine(ctx, c2, pt2, 1, Color(0.0, 1.0, 1.0 ));
}
drawCircle(ctx, pt2, 2, Color(1.0f, 0.0f, 1.0f));
drawCircle(ctx, pt1, 2, Color(1.0f, 0.0f, 0.0f), true);
}
if (mode == 4) {
drawLine(ctx, pt1, pt2, 1, Color(1.0, 1.0, 1.0 ));
drawCircle(ctx, pt1, 5, Color(1.0, 0.0, 0.0), true);
drawCircle(ctx, pt2, 3, Color(1.0, 0.0, 1.0));
}
pointIndex += 3;
break;
}
case Path2d::MOVETO:
// don't do anything with this point
pointIndex += 0;
break;
default:
pointIndex += 1;
break;
}
}
if (mode== 5) {
// draw a line between the last bezier point and the current point
for (i=1; i<pathPoints.size(); i++) {
drawLine(ctx, pathPoints[i-1], pathPoints[i], 1.0, Color(1.0, 0.0, 0.0));
}
}
}