看到很多初学者因为如何加载显示图片, 如何旋转缩放平移图片， 如何显示带半透明的图片纠结不已， 这里直接给出一个例子， 请作参考: (操作方式， 按下空格键可以弹出对话框， 你可以选择多张图片直接绘制随机动画。 按下A键可以添加一个随机大小的几何图形， 详见代码, 直接复制下方全部代码到一个cpp文件里面运行即可)
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#define SHOW_CONSOLE #include "graphics.h" #include <vector> #include <string> #include <cstdlib> #include <direct.h> #define MAX_IMAGES 100 using namespace std; typedef struct Element { Element(PIMAGE img = nullptr) : pimg(img), centerX(random(100) / 100.0f), centerY(random(100) / 100.0f), x(100.0f), y(100.0f), dx(random(6.0f) + 2.0f), dy(random(6.0f) + 2.0f), rot(random(100) / 100.0f), dRot(random(100) / 1000.0f), scaling(1.0f), dScaling(0.99f) {} PIMAGE pimg; float centerX, centerY; float x, y; float dx, dy; float rot, dRot; float scaling, dScaling; }Element; std::vector<Element> readMultiFileNameDlg(HWND hwnd, const char* title) { vector <Element> images; vector<char> buffer; buffer.resize(4096); buffer[0] = 0; OPENFILENAMEA ofn; memset(&ofn, 0, sizeof(ofn)); ofn.hwndOwner = hwnd; ofn.lStructSize = sizeof(ofn); ofn.Flags = OFN_EXPLORER | OFN_ALLOWMULTISELECT; ofn.lpstrFile = buffer.data(); ofn.nMaxFile = 4096; ofn.lpstrFilter = "Image Files(*.jpg;*.png;*.bmp;*.gif)\0*.jpg;*.jpeg;*.png;*.bmp;*.gif\0All Files(*.*)\0*.*\0\0"; ofn.lpstrTitle = title; if (!GetOpenFileNameA(&ofn)) return images; const char* openFileNames = buffer.data(); int offset = ofn.nFileOffset; buffer[offset - 1] = '\0'; _chdir(openFileNames); openFileNames += offset; while (*openFileNames) { string tmp = buffer.data(); tmp += "\\"; tmp += openFileNames; while (*openFileNames++); PIMAGE pimg = newimage(); if (getimage_pngfile(pimg, tmp.c_str()) == 0 || getimage(pimg, tmp.c_str()) == 0) { Element e; e.pimg = pimg; //对导入图片进行缩小操作, 防止图片过大导致卡顿. float scaling = max(getwidth(pimg) / 100.0f, getheight(pimg) / 100.0f); if (scaling > 1.0f) { PIMAGE resizeImage = newimage(getwidth(pimg) / scaling, getheight(pimg) / scaling); //将大图绘制到小图上。 putimage(resizeImage, 0, 0, getwidth(resizeImage), getheight(resizeImage), pimg, 0, 0, getwidth(pimg), getheight(pimg)); e.pimg = resizeImage; delimage(pimg); //使用重置大小之后的图片， 释放原始大小图片 } images.push_back(e); } else { printf("加载图片 %s 失败!\n", tmp.c_str()); delimage(pimg); } } return images; } void addSimplePic(vector<Element>& v, int w, int h) { int hw = w / 2, hh = h / 2; PIMAGE pimg = newimage(w, h); cleardevice(pimg); //清除pimg setcolor(0xffff0000 + random(0xffff), pimg); setfillcolor(0xffff0000 + random(0xffff), pimg); ege_fillrect(hw, hh, hw, hh, pimg); setcolor(0xffff0000, pimg); setfillcolor(0xff00ff00 + random(0xffff), pimg); ege_fillellipse(hw * 0.34f, hh * 0.34f, hw * 1.66f, hh * 1.66f, pimg); setcolor(0xff00ff00, pimg); setfillcolor(0xff0000ff + random(0xffff00), pimg); ege_fillellipse(hw * 0.66f, hh * 0.66f, hw * 1.34f, hh * 1.34f, pimg); // int bufferLen = w * h; // color_t* buffer = getbuffer(pimg); // //若使用的EGE函数不绘制alpha通道， 则在这里进行填充. // for (int i = 0; i != bufferLen; ++i) // { // color_t& c = buffer[i]; // if (c != 0) c |= 0xff000000; // } Element e; e.pimg = pimg; v.push_back(e); } bool dealMsg(vector<Element>& imgs) { while (kbhit()) { int c = getch(); switch (c) { case key_esc: return false; case 'a': case 'A': { auto&& result = readMultiFileNameDlg(getHWnd(), "请选择多张图片!!"); if (result.size() != 0) { if (imgs.size() + result.size() > MAX_IMAGES && imgs.size() != MAX_IMAGES) { size_t sz = min(result.size(), MAX_IMAGES - imgs.size()); imgs.insert(imgs.end() - 1, result.begin(), result.begin() + sz); puts("图片数达到最大值!"); } else { imgs.insert(imgs.end() - 1, result.begin(), result.end()); puts("图片添加完毕!\n"); } } } break; case key_space: case key_enter: { if (imgs.size() < MAX_IMAGES) { int sz = random(50) + 30; addSimplePic(imgs, sz, sz); puts("添加随机图形!\n"); } else puts("图片数达到最大值!"); } break; default: break; } } return true; } int main() { static const int W = 800, H = 600; vector<Element> imgs; initgraph(W, H, INIT_RENDERMANUAL); setbkmode(TRANSPARENT); setcolor(WHITE); addSimplePic(imgs, 100, 100); // is_run() 表示窗口绘图上下文存在, 当点击窗口右上角的叉叉的时候会返回false(大概) for (; is_run(); delay_fps(60)) { if(!dealMsg(imgs)) break; cleardevice(); for (Element& e : imgs) { //慢速操作 putimage_rotatezoom(nullptr, e.pimg, e.x, e.y, 0.5f, 0.5f, e.rot, e.scaling, 1, 0xc0, 1); //putimage_withalpha(nullptr, e.pimg, e.x, e.y); //这个版本的带alpha半透明， 但是无法进行旋转等操作 e.x += e.dx; e.y += e.dy; e.rot += e.dRot; e.scaling *= e.dScaling; if (e.x < 0 || e.x > W) e.dx = -e.dx; if (e.y < 0 || e.y > H) e.dy = -e.dy; if (e.scaling < 0.5f || e.scaling > 2.0f) e.dScaling = e.scaling > 1.0f ? 0.99f : 1.01f; } { int x, y; mousepos(&x, &y); outtextxy(x - 100, y - 10, "按下空格键添加随机图形, 按A键添加图片!"); } } for (auto& e : imgs) { delimage(e.pimg); //记得收尾， 养成良好习惯 } imgs.clear(); closegraph(); return 0; } |
注意: 如果在devcpp(或者cfree等)编译器中无法编译， 请加上 c++11的编译参数
如， devcpp可以加上如下:
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