lv_matrix.h
Functions
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void lv_matrix_identity(lv_matrix_t *matrix)
Set matrix to identity matrix
- 参数:
matrix -- pointer to a matrix
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void lv_matrix_translate(lv_matrix_t *matrix, float tx, float ty)
Translate the matrix to new position
- 参数:
matrix -- pointer to a matrix
tx -- the amount of translate in x direction
tx -- the amount of translate in y direction
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void lv_matrix_scale(lv_matrix_t *matrix, float scale_x, float scale_y)
Change the scale factor of the matrix
- 参数:
matrix -- pointer to a matrix
scale_x -- the scale factor for the X direction
scale_y -- the scale factor for the Y direction
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void lv_matrix_rotate(lv_matrix_t *matrix, float degree)
Rotate the matrix with origin
- 参数:
matrix -- pointer to a matrix
degree -- angle to rotate
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void lv_matrix_skew(lv_matrix_t *matrix, float skew_x, float skew_y)
Change the skew factor of the matrix
- 参数:
matrix -- pointer to a matrix
skew_x -- the skew factor for x direction
skew_y -- the skew factor for y direction
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void lv_matrix_multiply(lv_matrix_t *matrix, const lv_matrix_t *mul)
Multiply two matrix and store the result to the first one
- 参数:
matrix -- pointer to a matrix
matrix2 -- pointer to another matrix
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bool lv_matrix_inverse(lv_matrix_t *matrix, const lv_matrix_t *m)
Invert the matrix
- 参数:
matrix -- pointer to a matrix
m -- pointer to another matrix (optional)
- 返回:
true: the matrix is invertible, false: the matrix is singular and cannot be inverted
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lv_point_precise_t lv_matrix_transform_precise_point(const lv_matrix_t *matrix, const lv_point_precise_t *point)
Transform a point by a matrix
- 参数:
matrix -- pointer to a matrix
point -- pointer to a point
- 返回:
the transformed point
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lv_area_t lv_matrix_transform_area(const lv_matrix_t *matrix, const lv_area_t *area)
Transform an area by a matrix
- 参数:
matrix -- pointer to a matrix
area -- pointer to an area
- 返回:
the transformed area
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bool lv_matrix_is_identity_or_translation(const lv_matrix_t *matrix)
Check if the matrix is identity or translation matrix
- 参数:
matrix -- pointer to a matrix
- 返回:
true: the matrix is identity or translation matrix, false: the matrix is not identity or translation matrix