在Linux上，如何将文本绘制到位图中?-OnLinux,howtodrawatexttoabitmap?

2  

You'll need to choose a C or C++ graphics library. Qt and SDL are two good choices.

您需要选择一个C或c++图形库。Qt和SDL是两个不错的选择。

=========================================================================

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

If all you want is to draw an image, another choice is libGD (along with the aforementioned Qt and SDL).

如果您想要绘制一个图像，另一个选择是libGD(以及前面提到的Qt和SDL)。

Jere is an example:

Jere就是一个例子:

https://cs.marlboro.edu/code/c/GD_example/GD_example.c

https://cs.marlboro.edu/code/c/GD_example/GD_example.c

include 
#include 

// Dimensions of image in pixels
#define IMAGE_WIDTH  300
#define IMAGE_HEIGHT 300

// The data to display is in a DATA_SIZE x DATA_SIZE array,
// which will have its (left,top)=(x,y) corner at 
// (DATA_TOP, DATA_LEFT) pixels in from the (0,0)=(left,top) pixel.
#define DATA_SIZE    8
#define DATA_LEFT    30
#define DATA_TOP     30

// Position of some blue lines drawn in the image.
#define BORDER       10
#define LEFT         BORDER
#define RIGHT        IMAGE_WIDTH - BORDER
#define TOP          BORDER
#define BOTTOM       IMAGE_HEIGHT - BORDER

// See the bottom of this code for a discussion of some output possibilities.
char*   filename =   "GD_example.png";

// Some values that'll go into the image as shades of gray.
// Range is 0 to 255 (i.e. 8 bits, which is the standard range of intensity).
// To do this sort of thing with floating point data or other data,
// you'd first scale your numbers to be in this 0 to 255 range.
int     data[DATA_SIZE][DATA_SIZE] ={
  {  2,  10,  10,  10,  10,  10,  10,   2},
  { 10,  20,  30,  40,  40,  30,  20,  10},
  { 10,  30, 100, 100, 100, 100,  30,  10},
  { 10,  40, 100, 200, 200, 100,  40,  10},
  { 10,  30, 100, 200, 200, 100,  30,  10},
  { 10,  20, 100, 100, 100, 100,  20,  10},
  { 10,  10,  20,  30,  40,  30,  10,  10},
  {  2,  10,  10,  10,  10,  10,  10,   2}
};
int main(){
  FILE*       outfile;                                  // defined in stdio
  gdImagePtr  image;                                    // a GD image object
  int         white, blue, gray[255];                   // some GD colors 
  int         i, x, y;                                  // array subscripts

  printf("=== GD example ===\n");

  printf("Creating %i by %i image.\n", IMAGE_WIDTH, IMAGE_HEIGHT);
  image = gdImageCreate(IMAGE_WIDTH, IMAGE_HEIGHT);
  // Or image = gdImageCreateTrueColor(IMAGE_WIDTH, IMAGE_HEIGHT);
  //    followed by colors like white=gdTrueColor(255,255,255) that don't
  //    need to refer to any one image's color table.
  white = gdImageColorAllocate(image, 255,255,255);    //  1st is background
  blue  = gdImageColorAllocate(image, 0,0,255);        //  (red,green,blue)
  for (i=0; i<255; i++){
    gray[i] = gdImageColorAllocate(image, i,i,i);
  }

  printf("Drawing some blue lines.\n");
  gdImageLine(image, LEFT,TOP,     RIGHT,TOP,    blue); // draw lines in image
  gdImageLine(image, RIGHT,TOP,    RIGHT,BOTTOM, blue); //  +-----------------+
  gdImageLine(image, RIGHT,BOTTOM, LEFT,BOTTOM,  blue); //  |0,0       WIDTH,0|
  gdImageLine(image, LEFT,BOTTOM,  LEFT,TOP,     blue); //  |0,HEIGHT         |
                                                        //  +-----------------+
  printf("Filling in some gray pixels.\n");
  for (x=0; x