我正在将位图绘制到OLED屏幕上。每个图像的格式都类似于
`const静态无符号字符waddle_dee_0 [] PROGMEM = {bits};
目前,我一直在尝试添加动画并清理代码。为此,我创建了“位图”类。
此类将存储诸如大小,宽度以及包含指向图像各帧的指针的数组之类的内容,例如
const static unsigned char* const waddle_table[] PROGMEM = {
waddle_dee_0,
waddle_dee_1,
waddle_dee_2,
waddle_dee_3,
waddle_dee_4,
waddle_dee_5
};
在Bitmap.cpp中,我有一个构造函数和一个函数
#include "bitmaps.h"
Bitmap::Bitmap(double w, double h, uint8_t f, size_t s, const unsigned char* const b){
setWidth(w);
setHeight(h);
setFrames(f);
setSize(s);
setAllFrames(b);
}
void Bitmap::drawFrames(){
size_t currSize = this->getSize();
uint8_t numbOfFrames = this->getFrames();
double width = this->getWidth();
double height = this->getHeight();
Serial.println(currSize);
Serial.println(numbOfFrames);
for (int i = 0; i < numbOfFrames; i++)
{
const unsigned char* frameAt = this->getSingleFrame(i);
drawBitmap(0,0,width,height, frameAt, currSize);
delay(100);
}
}
并且在头文件中,我有定义
#include <stdint.h>
#include "Arduino.h"
// ensure this library description is only included once
#ifndef Bitmap_h
#define Bitmap_h
// library interface description
class Bitmap
{
// user-accessible "public" interface
public:
Bitmap(double w, double h, uint8_t f, size_t s, const unsigned char* const b);
double getWidth(){return width;}
double getHeight(){return height;}
uint8_t getFrames(){return frames;}
size_t getSize(){return size;}
double setWidth(double w){width = w;}
double setHeight(double h){height = h;}
uint8_t setFrames(uint8_t f){frames = f;}
size_t setSize(size_t s){size = s;}
//const unsigned char* const* getFrameArr(){return bitmap_frames;}
void drawFrames();
const unsigned char* const* getAllFrames(){return bitmap_frames;}
void setAllFrames(const unsigned char* const b){*bitmap_frames = b;}
const unsigned char* getSingleFrame(uint8_t f){return bitmap_frames[f];}
private:
double width;
double height;
uint8_t frames;
size_t size;
const unsigned char* const bitmap_frames[];
};
#endif
我的问题来自指针数组,以及如何正确复制这些帧或如何将指针正确复制到新数组(bitmap_frames)。目的是使bitmap_frames与waddle_table数组相同,因此我可以遍历索引以一次依次绘制每个位图。当我只有一个硬编码数组时,我的代码可以正常工作,但是在尝试将其概括后,我遇到了许多类型错误和不一致的情况。
[如果有人可以引导我朝正确的方向前进,那么我似乎迷失在指针系统中。谢谢!
如果您想将bitmap_frames
声明为const flexible数组,则无法将其复制到它,而应在构造函数中对其进行初始化:
Bitmap::Bitmap() : bitmap_frames {waddle_dee_0, waddle_dee_1, waddle_dee_2, waddle_dee_3, waddle_dee_4, waddle_dee_5} {}
或者您可以在类定义中将bitmap_frames
声明为静态的:
static const unsigned char *const bitmap_frames[];
并在源文件中定义:
const unsigned char *const Bitmap::bitmap_frames[] = {
waddle_dee_0,
waddle_dee_1,
waddle_dee_2,
waddle_dee_3,
waddle_dee_4,
waddle_dee_5};
也可以只使用std::vector
:
const std::vector<const unsigned char*> bitmap_frames;
在构造函数中:
Bitmap::Bitmap() : bitmap_frames(std::begin(waddle_table), std::end(waddle_table)) {}