bitmap rotate 90 deg
To rotate a bitmap image 90 degrees using C++, you can follow these steps:
- Declare variables: Start by declaring variables to hold the dimensions of the original bitmap image, the dimensions of the rotated image, and any necessary loop counters. For example:
cpp
int originalWidth, originalHeight;
int rotatedWidth, rotatedHeight;
int x, y;
- Get input: Prompt the user to enter the dimensions of the original bitmap image. Store the values in the respective variables. For example:
```cpp cout << "Enter the width of the original bitmap image: "; cin >> originalWidth;
cout << "Enter the height of the original bitmap image: "; cin >> originalHeight; ```
- Calculate rotated dimensions: Calculate the dimensions of the rotated image by swapping the width and height of the original image. For example:
cpp
rotatedWidth = originalHeight;
rotatedHeight = originalWidth;
- Create arrays: Declare two-dimensional arrays to hold the original and rotated bitmap images. For example:
cpp
int originalBitmap[originalHeight][originalWidth];
int rotatedBitmap[rotatedHeight][rotatedWidth];
- Get original bitmap: Prompt the user to enter the pixel values of the original bitmap image and store them in the originalBitmap array. For example:
cpp
cout << "Enter the pixel values of the original bitmap image:" << endl;
for (y = 0; y < originalHeight; y++) {
for (x = 0; x < originalWidth; x++) {
cout << "Pixel (" << x << ", " << y << "): ";
cin >> originalBitmap[y][x];
}
}
- Rotate the image: Use nested loops to iterate through the original bitmap image and assign the corresponding pixel values to the rotated bitmap image. The new pixel coordinates can be calculated by swapping the x and y values and subtracting the original x value from the rotated height. For example:
cpp
for (y = 0; y < originalHeight; y++) {
for (x = 0; x < originalWidth; x++) {
rotatedBitmap[x][rotatedHeight - y - 1] = originalBitmap[y][x];
}
}
- Display the rotated image: Use nested loops to iterate through the rotated bitmap image and display the pixel values to the console. For example:
cpp
cout << "Rotated bitmap image:" << endl;
for (y = 0; y < rotatedHeight; y++) {
for (x = 0; x < rotatedWidth; x++) {
cout << rotatedBitmap[y][x] << " ";
}
cout << endl;
}
- Optional: Save the rotated image to a file or perform any additional processing as needed.
Remember to include the necessary C++ libraries and syntax for input/output operations in your code.