<html>
<meta http-equiv="content-type" charset="utf-8">
<head>
<title>画像の切り出し</title>
<link rel="icon" href="/favicon.ico">
<meta http-equiv="Expires" content="0">
</head>
<body>
<input id="target" type="file" onchange="inputChange()"> <!-- ファイルから読み込み用 -->
<span id="PasteBoxW" style="border:1px solid;background-color: #FFAAAA;">
<span id="PasteBox" contenteditable="true">ここに画像をペースト</span> <!-- コピペ用 -->
</span>
<canvas id="CanvasBaseGP" style="width:0;height:0;visibility:hidden;"></canvas> <!-- 読み込んだ画像退避用Canvas、画面上には表示させない -->
<br>
<span id="codestep"></span><br>
Mouse X:<span id="MouseX"></span> Y:<span id="MouseY"></span> <span id="MouseClick"></span><br>
Size X:<span id="SizeX" ></span> Y:<span id="SizeY" ></span><br>
Pos X:<span id="PosX" ></span> Y:<span id="PosY" ></span><br>
<br>
<canvas id="CanvasID" style="border:1px solid;"></canvas><br> <!-- 表示されるメインのCanvas -->
<button type="button" onclick="img_trim()">画像を切り出し</button><span id="img_trim"></span><br>
<canvas id="CanvasTrim"></canvas><br>
<br>
<br>
<script language="JavaScript">
const SpacerSize = 15; // スペーサーのサイズ
var CvsBaseEmt = document.getElementById("CanvasBaseGP");
var CvsBaseCtx = CvsBaseEmt.getContext("2d");
// 初期処理
var CvsViewEmt = document.getElementById("CanvasID");
var CvsViewCtx = CvsViewEmt.getContext("2d");
var OldPosX = -1;
var OldPosY = -1;
var ClickNow = false;
var ClickPosX1 = -1;
var ClickPosX2 = -1;
var ClickPosY1 = -1;
var ClickPosY2 = -1;
// 最初の実行
document.addEventListener('DOMContentLoaded', function(){ DOMContentLoaded_Exec(); } , false )
function DOMContentLoaded_Exec() {
CvsBaseEmt.width = 640;
CvsBaseEmt.height = 480;
//document.getElementById("codestep").innerHTML += CvsBaseEmt.width;
CvsBaseCtx.fillStyle = "rgba(255,255,255,1.0)"; // 中の色
CvsBaseCtx.fillRect(0 ,0, CvsBaseEmt.width, CvsBaseEmt.height);
// BaseのCanvasからView用Canvasを初期化
InitViewCanvas( CvsBaseEmt , CvsViewEmt , CvsViewCtx );
//document.getElementById("SizeX").innerHTML = CvsBaseEmt.width;
//document.getElementById("SizeY").innerHTML = CvsBaseEmt.height;
//document.getElementById("codestep").innerHTML += 'A';
}
function img_trim(){
var CvsTrimEmt = document.getElementById("CanvasTrim");
var CvsTrimCtx = CvsTrimEmt.getContext("2d");
CvsTrimEmt.width = ClickPosX2 - ClickPosX1;
CvsTrimEmt.height = ClickPosY2 - ClickPosY1;
document.getElementById("img_trim").innerHTML += CvsTrimEmt.width + ',' + CvsTrimEmt.height;
// 画像をコピー
//CvsTrimCtx.drawImage( CvsBaseEmt , ClickPosX1 , ClickPosY1 );
CvsTrimCtx.drawImage( CvsBaseEmt , ClickPosX1 , ClickPosY1 , CvsTrimEmt.width , CvsTrimEmt.height , 0 , 0 , CvsTrimEmt.width , CvsTrimEmt.height );
document.getElementById("img_trim").innerHTML += 'Trim. ';
}
function GetCvsViewPos( e ){
// マウス位置取得
//var MouseX = e.pageX; //X座標
//var MouseY = e.pageY; //Y座標
var MouseX = e.clientX; //X座標
var MouseY = e.clientY; //Y座標
// マウス位置表示
document.getElementById("MouseX").innerHTML = MouseX;
document.getElementById("MouseY").innerHTML = MouseY;
// 表示画像の位置取得
var CvsViewRect = CvsViewEmt.getBoundingClientRect();
//document.getElementById("PosX").innerHTML = EmtRect.left;
//document.getElementById("PosY").innerHTML = EmtRect.top;
var PosX = Math.floor( MouseX - CvsViewRect.left - SpacerSize - 1 );
var PosY = Math.floor( MouseY - CvsViewRect.top - SpacerSize - 1 );
if( PosX < 0 ){
PosX = 0;
}
if( PosX >= CvsViewEmt.width - ( SpacerSize * 2 ) ){
PosX = CvsViewEmt.width - ( SpacerSize * 2 ) - 1 ;
}
if( PosY < 0 ){
PosY = 0;
}
if( PosY >= CvsViewEmt.height - ( SpacerSize * 2 ) ){
PosY = CvsViewEmt.height - ( SpacerSize * 2 ) - 1 ;
}
return {
x: PosX
, y: PosY
};
}
// // 点のコピー
// function CvsCopyDot( SrcPixels , SrcX , SrcY , SrcWidthSize , DstPixels , DstX , DstY , DstWidthSize ){
// var Pos = SrcWidthSize * SrcY + SrcX;
// var RGB = {R:SrcPixels[Pos * 4 + 0]
// ,G:SrcPixels[Pos * 4 + 1]
// ,B:SrcPixels[Pos * 4 + 2]};
// CvsDrawingDot( DstPixels , DstX , DstY , DstWidthSize , RGB );
// }
//
// // 横線のコピー
// function CvsCopylineHorizontal( SrcPixels , SrcX1 , SrcX2 , SrcY , SrcWidthSize , DstPixels , DstX , DstY , DstWidthSize ){
//
// for (var AddPosX = 0; AddPosX < (SrcX2 - SrcX1); AddPosX++ ) {
// CvsCopyDot( SrcPixels , SrcX1 + AddPosX , SrcY , SrcWidthSize , DstPixels , DstX + AddPosX , DstY , DstWidthSize ); // 点のコピー
// }
//
// }
//
// // 縦線のコピー
// function CvsCopylineVertical( SrcPixels , SrcX , SrcY1 , SrcY2 , SrcWidthSize , DstPixels , DstX , DstY , DstWidthSize ){
//
// for (var AddPosY = 0; AddPosY < (SrcY2 - SrcY1); AddPosY++ ) {
// CvsCopyDot( SrcPixels , SrcX , SrcY1 + AddPosY , SrcWidthSize , DstPixels , DstX , DstY + AddPosY , DstWidthSize ); // 点のコピー
// }
//
// }
// 点の描画
//function CvsDrawingDot( Pixels , X , Y , WidthSize , R , G , B ){
function CvsDrawingDot( Pixels , X , Y , WidthSize , RGB ){
var Pos = WidthSize * Y + X;
Pixels[Pos * 4 + 0] = RGB.R; // R
Pixels[Pos * 4 + 1] = RGB.G; // G
Pixels[Pos * 4 + 2] = RGB.B; // B
Pixels[Pos * 4 + 3] = 255; // Alpha
}
// 横線の描画
//function CvsDrawinglineHorizontal( Pixels , X1 , X2 , Y , WidthSize , R , G , B ){
function CvsDrawinglineHorizontal( Pixels , X1 , X2 , Y , WidthSize , RGB ){
if( X1 > X2 ){
var WrkX = X1;
X1=X2;
X2=WrkX;
}
for (var WrkPosX = X1; WrkPosX < X2; WrkPosX++ ) {
//CvsDrawingDot( Pixels , WrkPosX , Y , WidthSize , R , G , B ); // 点の描画
CvsDrawingDot( Pixels , WrkPosX , Y , WidthSize , RGB ); // 点の描画
}
}
// 縦線の描画
//function CvsDrawinglineVertical( Pixels , X , Y1 , Y2 , WidthSize , R , G , B ){
function CvsDrawinglineVertical( Pixels , X , Y1 , Y2 , WidthSize , RGB ){
if( Y1 > Y2 ){
var WrkY = Y1;
Y1=Y2;
Y2=WrkY;
}
for (var WrkPosY = Y1; WrkPosY < Y2; WrkPosY++ ) {
//CvsDrawingDot( Pixels , X , WrkPosY , WidthSize , R , G , B ); // 点の描画
CvsDrawingDot( Pixels , X , WrkPosY , WidthSize , RGB ); // 点の描画
}
}
// マウス移動時のイベントをBODYタグに登録する
document.body.addEventListener("mousemove", function(e){
var CvsViewPos = GetCvsViewPos( e );
document.getElementById("PosX").innerHTML = CvsViewPos.x;
document.getElementById("PosY").innerHTML = CvsViewPos.y;
// 画像をコピー
CvsViewCtx.drawImage( CvsBaseEmt , SpacerSize , SpacerSize );
// キャンバス全体のピクセル情報を取得
var CvsViewImageData = CvsViewCtx.getImageData(0, 0 , CvsViewEmt.width , CvsViewEmt.height );
var CvsViewImagePixels = CvsViewImageData.data;
var CvsBaseImagePixels = CvsBaseCtx.getImageData(0, 0 , CvsBaseEmt.width , CvsBaseEmt.height ).data;
// ==========================================================================================================================================================================
// // 前回の変更を戻す
// if( OldPosX != -1 || OldPosY != -1 ){
//
// // 横ガイド線の消去
// CvsCopylineHorizontal( CvsBaseImagePixels , 0 , CvsBaseEmt.width , OldPosY , CvsBaseEmt.width
// , CvsViewImagePixels , SpacerSize , OldPosY + SpacerSize , CvsViewEmt.width );
// // 縦ガイド線の消去
// CvsCopylineVertical ( CvsBaseImagePixels , OldPosX , 0 , CvsBaseEmt.height , CvsBaseEmt.width
// , CvsViewImagePixels , OldPosX + SpacerSize , SpacerSize , CvsViewEmt.width );
//
// }
// 横ガイド線の描画
//CvsDrawinglineHorizontal( CvsViewImagePixels , SpacerSize , CvsBaseEmt.width + SpacerSize , CvsViewPos.y + SpacerSize , CvsViewEmt.width , 0 , 0 , 0 );
CvsDrawinglineHorizontal( CvsViewImagePixels , SpacerSize , CvsBaseEmt.width + SpacerSize , CvsViewPos.y + SpacerSize , CvsViewEmt.width , {R:0,G:0,B:0} );
// 縦ガイド線の描画
//CvsDrawinglineVertical( CvsViewImagePixels , CvsViewPos.x + SpacerSize , SpacerSize , CvsBaseEmt.height + SpacerSize , CvsViewEmt.width , 0 , 0 , 0 );
CvsDrawinglineVertical( CvsViewImagePixels , CvsViewPos.x + SpacerSize , SpacerSize , CvsBaseEmt.height + SpacerSize , CvsViewEmt.width , {R:0,G:0,B:0} );
// ==========================================================================================================================================================================
// 範囲線の描画
// if( ClickPosX1 != -1 || ClickPosY1 != -1 ){ // 前回の変更を戻す
// CvsCopylineHorizontal( CvsBaseImagePixels , ClickPosX1 , ClickPosX2 , ClickPosY1 , CvsBaseEmt.width
// , CvsViewImagePixels , ClickPosX1 + SpacerSize , ClickPosY1 + SpacerSize , CvsViewEmt.width );
//
// }
if( ClickNow == true){
ClickPosX2 = CvsViewPos.x;
ClickPosY2 = CvsViewPos.y;
}
//document.getElementById("codestep").innerHTML = ClickPosX1 + ',' + ClickPosX2;
if( ClickPosX1 != -1 && ClickPosX2 != -1 ){
CvsDrawinglineHorizontal( CvsViewImagePixels , ClickPosX1 + SpacerSize , ClickPosX2 + SpacerSize , ClickPosY1 + SpacerSize , CvsViewEmt.width , {R:255,G:0,B:0} );
CvsDrawinglineHorizontal( CvsViewImagePixels , ClickPosX1 + SpacerSize , ClickPosX2 + SpacerSize , ClickPosY2 + SpacerSize , CvsViewEmt.width , {R:255,G:0,B:0} );
CvsDrawinglineVertical ( CvsViewImagePixels , ClickPosX1 + SpacerSize , ClickPosY1 + SpacerSize , ClickPosY2 + SpacerSize , CvsViewEmt.width , {R:255,G:0,B:0} );
CvsDrawinglineVertical ( CvsViewImagePixels , ClickPosX2 + SpacerSize , ClickPosY1 + SpacerSize , ClickPosY2 + SpacerSize , CvsViewEmt.width , {R:255,G:0,B:0} );
}
// ==========================================================================================================================================================================
// 変更した内容をキャンバスに書き戻す
CvsViewCtx.putImageData(CvsViewImageData, 0, 0);
OldPosX = CvsViewPos.x;
OldPosY = CvsViewPos.y;
});
document.body.addEventListener("mousedown", function(e) {
var CvsViewRect = CvsViewEmt.getBoundingClientRect();
//var PosX = Math.floor( MouseX - CvsViewRect.left - SpacerSize - 1 );
//var PosY = Math.floor( MouseY - CvsViewRect.top - SpacerSize - 1 );
if( CvsViewRect.left <= e.clientX && e.clientX <= CvsViewRect.left + CvsViewRect.width
&& CvsViewRect.top <= e.clientY && e.clientY <= CvsViewRect.top + CvsViewRect.height ){
var CvsViewPos = GetCvsViewPos( e );
ClickNow = true;
ClickPosX1 = CvsViewPos.x;
ClickPosY1 = CvsViewPos.y;
document.getElementById("MouseClick").innerHTML += 'Click(' + CvsViewPos.x + '/' + CvsViewPos.y + ')';
}
//document.getElementById("MouseClick").innerHTML += ' ' + e.clientX + '/' + e.clientY + ',' + CvsViewRect.left + '/' + CvsViewRect.top + ',' + CvsViewRect.width + '/' + CvsViewRect.height ;
});
document.body.addEventListener("mouseup", function(e) {
var CvsViewRect = CvsViewEmt.getBoundingClientRect();
if( CvsViewRect.left <= e.clientX && e.clientX <= CvsViewRect.left + CvsViewRect.width
&& CvsViewRect.top <= e.clientY && e.clientY <= CvsViewRect.top + CvsViewRect.height ){
var CvsViewPos = GetCvsViewPos( e );
ClickNow = false;
ClickPosX2 = CvsViewPos.x;
ClickPosY2 = CvsViewPos.y;
document.getElementById("MouseClick").innerHTML = '';
}
});
// 画像表示
function ViewImage( BlobUrl ) {
const chara = new Image();
chara.src = BlobUrl; // 画像のURLを指定
chara.onload = () => {
CvsBaseEmt.width = chara.naturalWidth ;
CvsBaseEmt.height = chara.naturalHeight ;
CvsBaseCtx.drawImage(chara, 0, 0 );
//document.getElementById("codestep").innerHTML += CvsViewEmt.width + 'x' + CvsViewEmt.height;
//document.getElementById("codestep").innerHTML += ' / ' + document.documentElement.clientWidth + 'x' + document.documentElement.clientHeight;
// BaseのCanvasからView用Canvasを初期化
InitViewCanvas( CvsBaseEmt , CvsViewEmt , CvsViewCtx );
};
};
// BaseのCanvasからView用Canvasを初期化
function InitViewCanvas( SrcEmt , DstEmt , DstCtx ) {
DstEmt.width = SrcEmt.width + SpacerSize * 2 ;
DstEmt.height = SrcEmt.height + SpacerSize * 2 ;
//DstCtx.strokeStyle = "rgb(0,0,0)";
//DstCtx.strokeRect( SpacerSize , SpacerSize , DstEmt.width - SpacerSize * 2 , DstEmt.height - SpacerSize * 2 );
// 画像をコピー
DstCtx.drawImage( SrcEmt , SpacerSize , SpacerSize );
// 枠線の描画
var CvsViewImageData = DstCtx.getImageData(0, 0 , CvsViewEmt.width , CvsViewEmt.height );
var CvsViewImagePixels = CvsViewImageData.data;
CvsDrawinglineHorizontal( CvsViewImagePixels , SpacerSize - 1 , DstEmt.width - SpacerSize + 1 , SpacerSize - 1 , DstEmt.width , {R:0,G:0,B:0} ); // 上
CvsDrawinglineHorizontal( CvsViewImagePixels , SpacerSize - 1 , DstEmt.width - SpacerSize + 1 , DstEmt.height - SpacerSize , DstEmt.width , {R:0,G:0,B:0} ); // 下
CvsDrawinglineVertical ( CvsViewImagePixels , SpacerSize - 1 , SpacerSize , DstEmt.height - SpacerSize , DstEmt.width , {R:0,G:0,B:0} ); // 左
CvsDrawinglineVertical ( CvsViewImagePixels , DstEmt.width - SpacerSize , SpacerSize , DstEmt.height - SpacerSize , DstEmt.width , {R:0,G:0,B:0} ); // 右
DstCtx.putImageData(CvsViewImageData, 0, 0);
document.getElementById("SizeX").innerHTML = SrcEmt.width ;
document.getElementById("SizeY").innerHTML = SrcEmt.height;
OldPosX = -1;
OldPosY = -1;
ClickPosX1 = -1;
ClickPosX2 = -1;
ClickPosY1 = -1;
ClickPosY2 = -1;
}
// 貼り付けイベントのリスナセット
contenteditable_paste_addevent();
function contenteditable_paste_addevent() {
// 貼り付けからイメージ取得
document.querySelector("[contenteditable]").addEventListener("paste", function (e) {
var PasteItems = e.clipboardData.items;
for (var Idx = 0; Idx < PasteItems.length; Idx++) {
if (PasteItems[Idx].type.indexOf("image") === 0) {
var BlobUrl = URL.createObjectURL(PasteItems[Idx].getAsFile());
// いろいろ弄れてしまうので戻しておく
document.getElementById("PasteBoxW").innerHTML = '<span id="PasteBox" contenteditable="true">ここに画像をペースト</span>';
// 戻したのでリスナ再セット
contenteditable_paste_addevent();
// 画像表示
ViewImage( BlobUrl );
return;
}
}
});
}
// ローカルファイルからイメージ選択
function inputChange() {
// 画像表示
ViewImage( window.URL.createObjectURL( document.getElementById("target").files[0] ) );
}
</script>
</body>
</html>
