MoveTo, LineTo, Quadto, Cubicto, ArcTo in Android (example)

Recently in the writing of Android paint often use these 什么什么To , at first I really do not know cubicTo this method, let alone can not tell them, so to make a small note, record the role of MoveTo, LineTo, Quadto, Cubicto, ArcTo, Often used when customizing the view.
Next, we'll share some of the things we wrote these days. I believe that for beginners will be a little help, Master also help to see there is right, welcome to spit Groove.

2, MoveTo

moveTodoes not draw and is used only to move the move brush.
Use it in the following ways.

3, LineTo

lineToUsed for line drawing.

Mpath.lineto (+); Canvas.drawpath (MPath, mpaint);

The default is drawn starting at coordinates (0,0).

Did we not say that we moveTo used to move the brushes?

Mpath.moveto (Mpath.lineto); Canvas.drawpath (MPath, mpaint);

Move the Brush (100,100) at the beginning of the drawing, the effect

4, Quadto

quadToUsed to draw a smooth curve, that is, a Bezier curve.

mPath.quadTo(x1, y1, x2, y2)(X1,Y1) is the control point, (X2,y2) is the end point.

In the same way, we need moveTo to help control.

Mpath.moveto (Mpath.quadto), Canvas.drawpath (MPath, Mpaint), (+);

Effect

5, Cubicto

cubicToThe same is used to achieve Bezier curves.

mPath.cubicTo(x1, y1, x2, y2, x3, y3)(X1,Y1) is the control point, (X2,y2) is the control point, (X3,Y3) is the end point.

So, cubicTo quadTo What's the difference?

This is what the authorities say:

Same as Cubicto, but the coordinates is considered relative to the current point in this contour.

To be blunt, it is a control point.

Then we want to draw the same curve as the previous one, how should we write it?

Mpath.moveto (+), Mpath.cubicto (100, 500, 300, 100, 600, 500);

Look at the effect:

Same!

What if we don't add moveTo it?

(0,0) is the starting point, (100,500) and (300,100) the Bezier curve is drawn for the control points:

6, ArcTo

arcToUsed to draw an arc (actually a part of a circle or ellipse).

mPath.arcTo(ovalRectF, startAngle, sweepAngle), the ovalRectF rectangle for the ellipse, the startAngle starting angle, and the sweepAngle end angle.

MRECTF = new RECTF (ten, ten, +), Mpath.arcto (MRECTF, 0, N); Canvas.drawpath (MPath, mpaint);

Because of the new RectF(10, 10, 600, 600) square and intercept 0 ~ 90 度 , the resulting curve is a one-fourth-circle arc.

Effect

MoveTo, LineTo, Quadto, Cubicto, ArcTo in Android (example)