I know this a stupid question to ask, but I was going through a tutorial
and I just dont seem to understand the below lines of code...Have pulled my
hair understanding the geometrical algorithm behind this, but.....Oh!!!
This is very simple but I just dont seem to get it. Please help....I am a
beginner...
private void drawPict(Canvas canvas, int x, int y, int w, int h,
float sx, float sy) {
canvas.save();
canvas.translate(x, y);
canvas.clipRect(0, 0, w, h);
canvas.scale(0.5f, 0.5f);
canvas.scale(sx, sy, w, h);
canvas.drawPicture(mPicture);
canvas.restore();
}
@SuppressWarnings("unused")
@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(mPicture.beginRecording(getWidth(),
getHeight()));
mPicture.endRecording();
int x = getWidth()/2;
int y = getHeight()/2;
if (false) {
canvas.drawPicture(mPicture);
} else {
drawPict(canvas, 0, 0, x, y, 1, 1);
drawPict(canvas, x, 0, x, y, -1, 1);
drawPict(canvas, 0, y, x, y, 1, -1);
drawPict(canvas, x, y, x, y, -1, -1);
}
}
I have looked into this again...and understand that canvas.scale has 4
parameters, being the co-ordinates of the points I assume...but I cannot
still understand the float sx, float sy...
sx=-1 and sy=1...it will scale, agreed...but is not there a better way?
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