Java 在受限空间中绘制坡度线
我有一个50x50像素的空间,我需要在其中画五条线:X轴和Y轴,最陡的、平均的和最平坦的斜率各画一条线 我使用的(Java)代码是在没有文档或注释的情况下传给我的,我以前从未在画布上画画。这是一个175x75像素的盒子的代码。如上所述,这需要针对50x50区域进行调整Java 在受限空间中绘制坡度线,java,math,canvas,drawing,Java,Math,Canvas,Drawing,我有一个50x50像素的空间,我需要在其中画五条线:X轴和Y轴,最陡的、平均的和最平坦的斜率各画一条线 我使用的(Java)代码是在没有文档或注释的情况下传给我的,我以前从未在画布上画画。这是一个175x75像素的盒子的代码。如上所述,这需要针对50x50区域进行调整 DrawingArea canvas = new DrawingArea(175, 75); canvasContainer.add(canvas); Rectangle rectangle = new R
DrawingArea canvas = new DrawingArea(175, 75);
canvasContainer.add(canvas);
Rectangle rectangle = new Rectangle(0, 0, 174, 75);
canvas.add(rectangle);
Line slopeMainLineX = new Line(5, 70, 170, 70);
slopeMainLineX.setStrokeOpacity(0.5);
canvas.add(slopeMainLineX);
Line slopeMainLineY = new Line(40, 70, 40, 0);
slopeMainLineY.setStrokeOpacity(0.5);
canvas.add(slopeMainLineY);
steepestLine = new Line(40, 70, 0, 0);
steepestLine.setStrokeWidth(3);
canvas.add(steepestLine);
avgSlopeLine = new Line(40, 70, 0, 0);
avgSlopeLine.setStrokeWidth(2);
canvas.add(avgSlopeLine);
flattestLine = new Line(40, 70, 0, 0);
flattestLine.setStrokeWidth(1);
canvas.add(flattestLine);
int steepestAngle = Math.round(site.getSlope().getMax());
int averageAngle = Math.round(site.getSlope().getAvg());
int flatestAngle = Math.round(site.getSlope().getMin());
double xPointSteepestAngle = 40 + 120 * Math.cos(steepestAngle*0.0174532925);
double yPointSteepestAngle = 70 + 120 * Math.sin(steepestAngle*0.0174532925);
double xPointAverageAngle = 40 + 120 * Math.cos(averageAngle*0.0174532925);
double yPointAverageAngle = 70 + 120 * Math.sin(averageAngle*0.0174532925);
double xPointFlatestAngle = 40 + 120 * Math.cos(flatestAngle*0.0174532925);
double yPointFlatestAngle = 70 + 120 * Math.sin(flatestAngle*0.0174532925);
steepestLine.setX2((int) xPointSteepestAngle);
steepestLine.setY2(70 - ((int) yPointSteepestAngle - 70));
avgSlopeLine.setX2((int) xPointAverageAngle);
avgSlopeLine.setY2(70 - ((int) yPointAverageAngle - 70));
flatestLine.setX2((int) xPointFlatestAngle);
flatestLine.setY2(70 - ((int) yPointFlatestAngle - 70));
我在这里完全迷路了,因此非常感谢您的帮助。您只需将它们转换为相应的Canvas命令即可。例如:
Rectangle rectangle = new Rectangle(0, 0, 174, 75);
canvas.add(rectangle);
Line slopeMainLineX = new Line(5, 70, 170, 70);
slopeMainLineX.setStrokeOpacity(0.5);
canvas.add(slopeMainLineX);
...
steepestLine.setStrokeWidth(3);
将成为:
ctx.fillRect(0, 0, 174, 75);
ctx.beginPath();
ctx.moveTo(5, 70);
ctx.lineTo(170, 70);
ctx.globalAlpha = 0.5;
...
ctx.lineWidth = 3;
将其从175x75更改为50x50只是划分坐标的问题。但是纵横比不一样,所以你要么压扁东西,要么切掉一个零件。请原谅,我显然忘了提到这是使用GWT的DrawingArea作为画布。此控件不存在您引用的命令。哦,抱歉。我以为你在使用HTML5画布。事实上,GWT中的命令与您使用的命令更接近。看这里:把东西做成一条线几乎是完全一样的