我們的影像由 Web 應用程式 (React) 上的用戶上傳,并通過我們的 API (Loopback) 保存在資料庫中。
這些影像將在我們的 Qt 應用程式中使用,它們應該有圓角。我們有一些處理限制,所以我們不能在 Qt 上剪輯或屏蔽影像。
我們現在有一些不成比例的影像,其中干角破壞了布局,我需要一種方法將它們裁剪成正確的比例,并在所有 4 個角上都有一個邊框半徑。對于我們的下一個應用程式,我們應該有兩個圓角和兩個正方形,但如果這不可能,我可以嘗試更改它。
到目前為止我研究過的內容:
- 裁剪庫(很多,但大多數都有矩形或圓形作為形狀的選項,并且沒有明確的方法來自定義形狀)。
- 將預先保存的蒙版添加到影像的 Alpha 通道的方法(無法真正找到可行的方法)。
- HTML 標簽畫布(仍在嘗試這種方法)。
只要不涉及對 Qt 應用程式的重大更改,我幾乎愿意嘗試任何事情。
uj5u.com熱心網友回復:
我會采用畫布方法,因為您將進行完全自定義,這很有用,因為您提到稍后將更改要求。
- 創建畫布
- 畫一個圓角矩形面具(見這些精彩的答案 1 和 2)
ctx.clip()繪制自定義路徑后使用。- 或
ctx.globalCompositeOperation = 'source-in'在繪制蒙版影像后使用
- 繪制具有所需寬度/高度和拉伸/填充行為的實際影像
- 使用匯出生成的影像
canvas.toDataURL()
let width = 300;
let height = 500;
let radius = 50;
let canvas = document.querySelector('canvas'); // document.createElement('canvas');
let ctx = canvas.getContext('2d');
canvas.width = width;
canvas.height = height;
ctx.beginPath();
ctx.moveTo(radius, 0);
ctx.lineTo(width - radius, 0);
ctx.quadraticCurveTo(width, 0, width, radius);
ctx.lineTo(width, height - radius);
ctx.quadraticCurveTo(width, height, width - radius, height);
ctx.lineTo(radius, height);
ctx.quadraticCurveTo(0, height, 0, height - radius);
ctx.lineTo(0, radius);
ctx.quadraticCurveTo(0, 0, radius, 0);
ctx.closePath();
ctx.clip();
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let image = new Image();
image.addEventListener('load', () => {
ctx.drawImage(image, 0, 0, width, height);
console.log(canvas.toDataURL());
});
image.src = imgUrl;
<canvas>
轉載請註明出處,本文鏈接:https://www.uj5u.com/houduan/434942.html
標籤:javascript 节点.js 反应 qt loopbackjs
