Messages

1

Graphics / Re: Rotate around 2 points at the same time

« on: October 13, 2016, 08:17:57 am »

This is what I actually did, and yeah, indeed, it's hard to move mouse along one axis. What I noticed, square moves around the 50:100 in any case.

The greatest problem anyway, is to rotate around 2 points at the same time (or maybe to make an illusion of it? If I move mouse diagonally square has to move around 50:100 and it's center). I was thinking about using the Transform directly, but I don't know how to apply it here.

2

Graphics / Rotate around 2 points at the same time

« on: October 13, 2016, 06:35:53 am »

Hello,

I'm trying to rotate a square around it's center when I'm moving mouse left/right, and to rotate it around point 50:100, when mouse is moving up/down. My implementation (which is wrong, obviously) makes my square to jump around 2 points on the screen; when it's supposed to rotate only around the center, it rotates around 50:100. Any suggestions/directions how to overcome this?

#include <SFML/Graphics.hpp>
#include <iostream>
using namespace sf;

Event evt;

int main(int argc, char* argv)
{
        RenderWindow window(VideoMode(600, 600), "test");

        RectangleShape test(Vector2<float>(20.0f, 20.0f));
        test.setFillColor(Color::Red);
        test.setPosition(300, 300);
        test.setOrigin(10, 10);

        Clock deltaTime;
        Clock timer;
        timer.restart();

        int mouseX = 0, mouseY = 0;
        int curMouseX = 0, curMouseY = 0;
        float offset = 100;
        bool moving = false;

        while (window.isOpen())
        {
                while (window.pollEvent(evt)) {
                        switch (evt.type)
                        {
                        case Event::MouseMoved:
                                curMouseX = mouseX;
                                curMouseY = mouseY;
                                mouseX = evt.mouseMove.x;
                                mouseY = evt.mouseMove.y;
                                moving = true;
               
                                break;
                        }                      
                }

                float elaspedTime = deltaTime.restart().asSeconds();

                if (curMouseX != mouseX && moving) {

                        test.setOrigin(10, 10);
                        test.rotate(360 * elaspedTime);
                        //  test.setOrigin(50, 100); Tried this to avoid jumping. When uncommented, doesn't rotate around the center.
                }

                if (curMouseY != mouseY && moving) {
                        test.setOrigin(50, 100);       
                        test.rotate(60 * elaspedTime);                 
                }
                window.clear();
                window.draw(test);
                window.display();
                moving = false;
        }
        return 0;
}