Qt 利用飞机图片画五边形

Posted 2020-12-01 duxie

最近练习Qt，需要一个飞机在屏幕上画五边形。虽然达到的效果不是非常的理想，但是勉强还是达到了效果，欢迎大家指正。用到的飞机图片如下。

第一步：初始化，在构造函数里面，把图片向左旋转18°

// 向左旋转18°
matrix.rotate(-18);
ui.label->setPixmap(QPixmap("C:\\Users\\Administrator.USER-20190313RI\\Desktop\\img\\life.png").transformed(matrix, Qt::SmoothTransformation));

第二步：在定时器里面执行如下代码

switch(flag)
        {
        case 1:
            {
                if (num == 10)
                {
                    num = 0;
                    flag = 2;
                    matrix.rotate(72);
                    ui.label->setPixmap(QPixmap("C:\\Users\\Administrator.USER-20190313RI\\Desktop\\img\\life.png").transformed(matrix, Qt::SmoothTransformation));
                }
                int x = ui.label->x() - 8;
                int y = ui.label->y() - 10;
                ui.label->move(x, y);
                num++;
                break;
            }
        case 2:
            {
                if (num == 10)
                {
                    num = 0;
                    flag = 3;
                    matrix.rotate(72);
                    ui.label->setPixmap(QPixmap("C:\\Users\\Administrator.USER-20190313RI\\Desktop\\img\\life.png").transformed(matrix, Qt::SmoothTransformation));
                }
                int x = ui.label->x() + 15;
                int y = ui.label->y() - 10;
                ui.label->move(x, y);
                num++;
                break;
            }
        case 3:
            {
                if (num == 10)
                {
                    num = 0;
                    flag = 4;
                    matrix.rotate(72);
                    ui.label->setPixmap(QPixmap("C:\\Users\\Administrator.USER-20190313RI\\Desktop\\img\\life.png").transformed(matrix, Qt::SmoothTransformation));
                }
                int x = ui.label->x() + 15;
                int y = ui.label->y() + 10;
                ui.label->move(x, y);
                num++;
                break;
            }
        case 4:
            {
                if (num == 10)
                {
                    num = 0;
                    flag = 5;
                    matrix.rotate(72);
                    ui.label->setPixmap(QPixmap("C:\\Users\\Administrator.USER-20190313RI\\Desktop\\img\\life.png").transformed(matrix, Qt::SmoothTransformation));
                }
                int x = ui.label->x() - 8;
                int y = ui.label->y() + 10;
                ui.label->move(x, y);
                num++;
                break;
            }
        case 5:
            {
                if (num == 10)
                {
                    num = 0;
                    flag = 1;
                    matrix.rotate(72);
                    ui.label->setPixmap(QPixmap("C:\\Users\\Administrator.USER-20190313RI\\Desktop\\img\\life.png").transformed(matrix, Qt::SmoothTransformation));
                }
                int x = ui.label->x() - 14;
                int y = ui.label->y();
                ui.label->move(x, y);
                num++;
                break;
            }
        default:
            {
                break;
            }
        }