public void zoomView(float factor) {
float newScaling;
if (scalingInterpolator.isActive()) {
newScaling = scalingInterpolator.getEndValue() * factor;
} else {
newScaling = currentScaling * factor;
}
scalingInterpolator.setStartEndValues(currentScaling, newScaling);
scalingInterpolator.startInterpolating();
}
public void translateView(float transX, float transY) {
float newTransX;
float newTransY;
if (transX != 0.0f) {
if (translationXInterpolator.isActive()) {
newTransX = translationXInterpolator.getEndValue() + transX;
} else {
newTransX = currentTranslation[0] + transX;
}
translationXInterpolator.setStartEndValues(currentTranslation[0], newTransX);
translationXInterpolator.startInterpolating();
}
if (transY != 0.0f) {
if (translationYInterpolator.isActive()) {
newTransY = translationYInterpolator.getEndValue() + transY;
} else {
newTransY = currentTranslation[1] + transY;
}
translationYInterpolator.setStartEndValues(currentTranslation[1], newTransY);
translationYInterpolator.startInterpolating();
}
}
@Override
public void onDraw(Canvas canvas) {
// zooming animation
if (scalingInterpolator.isActive()) {
setCurrentScaling(scalingInterpolator.getCurrentValue());
}
// translation animation
if (translationXInterpolator.isActive() || translationYInterpolator.isActive()) {
float transX = currentTranslation[0];
float transY = currentTranslation[1];
if (translationXInterpolator.isActive()) {
transX = translationXInterpolator.getCurrentValue();
}
if (translationYInterpolator.isActive()) {
transY = translationYInterpolator.getCurrentValue();
}
setCurrentTranslation(transX, transY);
}
// center rotation animation
if (centerRotationInterpolator.isActive()) {
setCurrentCenterRotation(centerRotationInterpolator.getCurrentValue());
}
// calculate current viewport matrix if necessary
if (getAndClearViewportFlag()) {
recalculateViewportTransformation();
recalculateSizeScale();
}
// clear background
canvas.drawColor(0xFF000000);
// draw audio scene
canvas.setMatrix(viewportTransformation);
synchronized (GlobalData.audioScene) {
GlobalData.audioScene.draw(canvas, currentInverseScaling);
}
// reset matrix
canvas.setMatrix(null);
// draw size scale
sizeScalePicture.draw(canvas);
}
