How to sequentially animate through different QStates after single button click
DanielJG last edited by
I have an image displayed on a QGraphicsView and I'm trying to make it move using a state machine. After clicking the image I want it to move down by 200px and then across to the right another 200px. This is the code I have so far but the issue is that instead of the image moving in the L shape as desired it moves diagonally i.e. instead of the animation transitioning from state 1 to state 2 and then to state 3, the animation transitions state 1 to state 3 skipping state 2.
@stateMachine = new QStateMachine(this);
QState *state_01 = new QState(stateMachine);
QState *state_02 = new QState(stateMachine);
QState *state_03 = new QState(stateMachine);
state_01->assignProperty(pixmap, "pos", QPointF(0, 0));
state_02->assignProperty(pixmap, "pos", QPointF(0, 200));
state_03->assignProperty(pixmap, "pos", QPointF(200, 200));
QAbstractTransition *transition_01 = state_01->addTransition(pixmap, SIGNAL(pixmapPressed()), state_02);
QAbstractTransition *transition_02 = state_02->addTransition(state_03);
transition_01->addAnimation(new QPropertyAnimation(pixmap, "pos"));
transition_02->addAnimation(new QPropertyAnimation(pixmap, "pos"));
I think I'm probably misusing the statement for the transition of state 2 to state 3 but I've tried other methods without success. The only other idea I haven't tried would be to check if the image has reached it's position for state 2 and somehow emit a signal to start the next transition to state 3 but I feel that maybe what I'm asking for can all be done with the state machine framework. How can I get the image to animate through the 3 states after clicking on the image only once to start the entire process?
Welcome to the forum.
You need to make the two animations separately for L shape movement. Create one animation to move down and another animation to move right. Place these animations in QSequentialAnimationGroup.
@QSequentialAnimationGroup *group = new QSequentialAnimationGroup;
Regarding the transition to state 3, you have added unconditional transition from State 2 to State 3. What is the trigger for State2 and State 3. If you have add the appropriate trigger like Signal, then it will work.